HP 38 Math Applications The first size listed is the downloaded file size and the second size listed is the size on the calculator.

There are 135 files totaling 2065KB in this category.

 1-Var Inequalities   (details) 38 ENG   9KB/2KB Solve inequalities using a number line. By Hewlett-Packard. 1998/06/22

 2x2 Systems   (details) 38 ENG   19KB/1KB Solve 2X2 systems of linear equations using substitution, linear combination, and Cramer's Rule. By Hewlett-Packard. 1998/06/22

 3D-Graph   (details) 38 FRA   5KB/4KB Three-dimensional plotter. By Yves Quemener. 1998/08/26

 Active Grapher   (details) 38 ENG   13KB/4KB Investigate rigid transformations of seven basic functions: y=x, y=x^2, y=x^3, y=|x|, y=x, y=1/x, and y=1/x^2. By Hewlett-Packard. 1998/06/22

 Alternating Bit Sum and Partial Sums   (details) 38 ENG   2KB/1KB A program to insert symbolics in the Sequence App to reproduce the sequence A065359 and its partial sums A005536. By Gerald Hillier. 2017/08/10

 Amplitude / Period   (details) 38 ENG   16KB/2KB Investigate the parameters A and B to see how they effect the functions y = Asin(Bx), y = Acos(Bx), y = Atan(Bx), y = Asec(Bx), y = Acsc(Bx), y = Acot(Bx). By Hewlett-Packard. 1998/06/22

 An Interesting Irregular Sequence   (details) 38 ENG   2KB/1KB A set of programs that generate an interesting irregular sequence, a generalized meta-Fibonacci sequence a(n) with parameters s=0 and k=5. This is A228297. Also generates A27868. By Gerald Hillier. 2017/09/20

 Angles   (details) 38 ENG   15KB/2KB Solve for the missing angle given a pair of complementary angles, a pair of supplementary angles, or a triangle. By Hewlett-Packard. 1998/06/22

 Archimedes   (details) 38 ENG   10KB/2KB Explore Archimedes' method for approximating the value of pi by comparing the area of a regular polygon to the area of the corresponding circumscribed circle. By Hewlett-Packard. 1998/06/22

 Area Model   (details) 38 ENG   12KB/2KB Multiply first degree monomials and binomials. By Hewlett-Packard. 1998/06/22

 Basic Functions   (details) 38 ENG   23KB/3KB Explore stretches, shrinks, and translations of seven basic graphs. By Hewlett-Packard. 1998/06/22

 Binomial Probabilities   (details) 38 ENG   2KB/1KB Program useful for students calculating Binomial Probabilities. It handles both individual and cumulative probabilities. By Andy Vella. 1999/08/24

 Bivariate Oddities   (details) 38 ENG   14KB/3KB This aplet contains sets of bivariate data which have the same summary statistics but totally different 'shapes' when graphed. They illustrate the need to rely on more than just the stats when deciding on whether a linear model is appropriate! By Colin Croft. 1998/05/24

 Camember   (details) 38 FRA   1KB/1KB Pie charting program. By Andréas Thillosen. 1998/08/26

 Cars 1993   (details) 38 ENG   18KB/2KB Explore relationships among the different data to investigate different cars, the cost, mpg, etc. By Hewlett-Packard. 1998/06/22

 Central Limits Theorem   (details) 38 ENG   41KB/2KB One of the most fundamental theorems in the study of statistical inference is the Central Limits Theorem. This states basically that the means of successive random samples taken from a population will be normally distributed whatever the underlying parent distribution. This aplet illustrates this and that the standard deviations are related by ratio. Sampling can be done from different parent distributions and the resulting collection of means compared to the equivalent Normal distribution. It is fairly slow to execute because of the need for repeated sampling but would be quite useful to teachers. By Colin Croft. 2003/05/20

 Chain Rule   (details) 38 ENG   23KB/2KB School activity for deducing the Chain Rule. By Colin Croft. 1998/05/24

 Chords   (details) 38 ENG   16KB/4KB This aplet uses chords of diminishing lengths to find the limiting gradient at a point. A worksheet leads the student into discovering differentiation. (Used to be called 'A Different Slant'). By Colin Croft. 2003/05/19

 Christmas Trees   (details) 38 ENG   10KB/2KB School activity for investigating some interesting graphs which create Christmas tree style plots. By Colin Croft. 1998/05/24

 Coin Toss   (details) 38 ENG   51KB/1KB This aplet investigates the common charity game consisting of tossing of a coin onto a square grid. It requires only knowledge of quadratic functions and can be used at a number of levels: to illustrate the convergence of experimental values towards theoretical ones, to investigate fitting a quadratic curve to experimental data, and to introduce the idea of a probability function. By Colin Croft. 1999/03/15

 Collisions   (details) 38 ENG   10KB/2KB This aplet takes a vector problem involving two objects having an initial position and velocity and analyses it as 'closest approach' style problem. A test tool rather than a teaching tool. By Colin Croft. 1999/03/15

 COMB Replacement   (details) 38 ENG   2KB/1KB A replacement for the COMB command that handles the A < B case without an error. By Gerald Hillier. 2017/11/20

 Complex Roots   (details) 38 ENG   10KB/1KB School activity to find the nth roots of any complex number and see them graphed on the Argand Plane. By Andy Vella. 1999/03/15

 Conic Plotter   (details) 38 ENG   27KB/2KB Investigate the conic sections in general and in standard form. By Hewlett-Packard. 1998/06/22

 Conics - Polar Form   (details) 38 ENG   26KB/1KB Investigate the polar form of the graphs of the conics to discover how changing the eccentricity and distance from the focus to the directrix effects the graph of the conic. By Hewlett-Packard. 1998/06/22

 Coordinate Geometry   (details) 38 ENG   16KB/3KB Find the midpoint, distance, and slope of a given line segment. By Hewlett-Packard. 1998/06/22

 Cosine   (details) 38 ENG   1KB/1KB Solves a triangle using the Law of Cosines. Author unknown. 1998/09/06

 Curve Area   (details) 38 ENG   37KB/2KB It uses upper and lower rectangles to find the areas under supplied curves. A worksheet then takes the student through the process of deducing the rules of integration. By Colin Croft. 2003/05/20

 Dandelions   (details) 38 ENG   119KB/2KB This aplet uses visual methods to illustrate and introduce the Poisson distribution, through the sowing of dandelion seeds into a large patch of ground, which is then broken up into unit squares. By Colin Croft. 1999/03/15

 Decimals   (details) 38 ENG   23KB/1KB Explore patterns and symmetry by ordering pairs of digits from the decimal expansion of certain fractions that have periodic decimals. By Hewlett-Packard. 1998/06/22

 Digit Reversal   (details) 38 ENG   1KB/1KB For a given natural number input, this returns the digit reversed number in Ans and variable T. This is OEIS A004086. By Gerald Hillier. 2017/10/04

 Dot to Dot   (details) 38 ENG   14KB/1KB Explore points, slopes and equations of lines that enclose the figures. It is also possible for the student to investigate the piecewise functions that would create the exact drawing. By Hewlett-Packard. 1998/06/22

 Drill Core   (details) 38 ENG   18KB/2KB Explore relationships among the different data to predict the percent of iron in a given sample. By Hewlett-Packard. 1998/06/22

 Drives   (details) 38 FRA   1KB/1KB Tracer of derived functions. By Cédric Messoumian. 1998/08/26

 Effects on f(x)   (details) 38 ENG   15KB/1KB Graph functions where negations and absolute values are applied to the function and its inputs. By Hewlett-Packard. 1998/06/22

 Engraisn   (details) 38 FRA   1KB/1KB Measurements of manure NPK (???). By Cédric Messoumian. 1998/08/26

 Equation   (details) 38 FRA   1KB/1KB Generator of Cartesian equations. By Cédric Messoumian. 1998/08/26

 Euclidean Division   (details) 38 ENG   139KB/1KB I'm not really sure what this is supposed to be; something about Euclidean Division By Bernard Parisse. 1998/05/24

 Factor 3rd Degree   (details) 38 FRA   1KB/1KB Factorization of third degree polynomials. By Cédric Messoumian. 1998/08/26

 Factoring   (details) 38 ENG   4KB/2KB Factor a polynomial of degree one, two, three or four. You can plot its graph and look at its factors. Has some documentation in Dutch as well. By Joost van 't Spijker. 1998/10/31

 Factoring   (details) 38 ENG   14KB/2KB Symbolically factor second degree polynomials in the form Ax^2+Bx+C. By Hewlett-Packard. 1998/06/22

 Factors   (details) 38 ENG   2KB/1KB A small program (not an aplet) which simply finds the factors of a given number and stores them into M1. Download it into the Program Catalog. By Barry van Oudtshoorn. 2017/07/25

 Fibonacci   (details) 38 ENG   20KB/2KB Determine an approximation for the golden mean using the ratio of width to length of the sides of the golden rectangles. By Hewlett-Packard. 1998/06/22

 Fonction   (details) 38 FRA   1KB/1KB Resolutions of circular functions. By Andréas Thillosen. 1998/08/26

 Function 3D   (details) 38 ENG   15KB/6KB 3D plotting program to display and investigate graphs of the form z=f(x,y). These are expressed as wireframe surfaces, in 3D space. The process of plotting is very slow but the results are excellent. By Quin Pendragon. 1999/03/15

 Function Deluxe   (details) 38 ENG   50KB/5KB A copy of the Function aplet with a vast number of extra features added via an amended VIEWS menu By Benjamin Kosta Pazolli. 2017/07/25

 Function Plus   (details) 38 ENG   7KB/1KB Adjusts axes to nice values so cross-hair 'jumps' are to useful points rather than horrible decimals. Trig gives \pi fractions. By Colin Croft. 2003/05/20

 GCD   (details) 38 ENG   2KB/1KB Computes the greatest common divisor of two integers a and b. By James Donnelly. 1998/05/24

 GP Solver   (details) 38 ENG   1KB/1KB Simply a copy of the Solve aplet with the relevant equations for geometric progressions pre-loaded. You can set it up easily yourself if you want to. By Colin Croft. 1998/05/24

 Grouped Data   (details) 38 ENG   18KB/5KB This aplet calculates and displays measures of central tendency and spread for data which has been grouped into intervals. The user puts the interval mid-points into C1, the frequencies into C2 and the aplet will display the mean, proportional median, lower and upper quartiles and various other values. The user can also perform calculations such as finding the values which cut off the top 15% of data, the middle 30% etc. By Colin Croft. 2003/05/20

 Guess Rational   (details) 38 ENG   15KB/4KB Write the equation of a rational function given horizontal and vertical asymptotes and a root. By Hewlett-Packard. 1998/06/22

 Guess the Line   (details) 38 ENG   12KB/2KB Write the equation of a line in slope-intercept form when given two points. By Hewlett-Packard. 1998/06/22

 Hill's Encryption System   (details) 38 ENG   1KB/1KB Implements Hill's Cypher system, which is a polygraphic substitution cipher based on linear algebra. By Gerald Hillier. 2017/03/04

 HP 38G Curves Collection   (details) 38 ENG   23KB/1KB Contains many aplets with curves for students to explore. By James Donnelly. 1998/05/24

 Indices Practice   (details) 38 ENG   15KB/1+KB This aplet provides simple drill practice for students learning the laws of indices, with the option of including negative powers. It presents students with practice problems in correct mathematical layout and then allows them to enter the simplified answer. There are a wide variety of styles of problems. It will then tell them if they are right or wrong, offering a second chance if needed. By Colin Croft. 2003/05/20

 Inequalities   (details) 38 ENG   4KB/3KB Graphically solve a system of linear inequalities. By Hewlett-Packard. 1998/06/22

 Inequations   (details) 38 ENG   9KB/2KB This is a copy of the function aplet with the additional ability to graph inequalities (linear/non-linear) for F1, F2 and F3(X). These can be overlaid to show intersections or unions. By Colin Croft. 1999/03/15

 Inference   (details) 38 ENG   17KB/6KB This aplet gives inferential statistics access for the 38G similarly to that of the 39/40G. The interface is not as smooth as the 39G version and there is no graphical view to aid in your judgment but it does the trick pretty well. Documentation is included. By Colin Croft and Detlef Müller. 2017/07/25

 Intensity   (details) 38 FRA   1KB/1KB Calculation of loudness. By Andréas Thillosen. 1998/08/26

 Inverses   (details) 38 ENG   18KB/3KB Explore inverse relations and functions. Analyze relations and functions graphically, numerically, and symbolically. By Hewlett-Packard. 1998/06/22

 Jacobi 1.0   (details) 38 ENG   3KB/1KB Calculates the Jacobi symbol indicating quadratic residue nature. By Gerald Hillier and B. Bock. 2006/08/28

 Key Finder   (details) 38 ENG   14KB/2KB School activity for investigating the statistical modeling of a simple experiment. By Colin Croft. 1999/03/15

 Last Digit Composite   (details) 38 Prime ENG   2KB/1KB Inserts symbolics in the Sequence App to produce the sequence of numbers having right-most digit composite. This is A262389. By Gerald Hillier and Didier Lachieze. 2017/09/20

 Last Non-Zero Digit of Factorial   (details) 38 ENG   2KB/1KB Inserts symbolics in the Sequence App to produce the sequence of numbers that are the last non-zero digit of the factorial of that number. This is A008904. By Gerald Hillier. 2017/09/26

 Law of Sines   (details) 38 ENG   16KB/3KB Solve oblique triangles by applying the laws of sines. By Hewlett-Packard. 1998/06/22

 Laws of Exponents   (details) 38 ENG   13KB/2KB Apply the laws of exponents to multiply and divide monomials and to raise a monomial to a power. By Hewlett-Packard. 1998/05/24

 LCM   (details) 38 ENG   2KB/1KB Computes the least common multiple of two integers a and b. By James Donnelly. 1998/05/24

 Line   (details) 38 ENG   2KB/2KB Line drawing program. By Steve Dunham. 1998/08/26

 Linear   (details) 38 ENG   30KB/3KB Identify the slope and the y-intercept given a linear equation, and will describe the various effects positive, negative and zero values have on the graph. By Colin Croft. 1998/06/22

 Linear Explorer   (details) 38 ENG   18KB/1KB An aplet similar to the Quadratic and Trig Explorers (but not as fast) which allows the student to explore linear graphs. The equation of the graph is displayed at the top left corner of the screen and the student can change the gradient and y-intercept using the arrow keys. Intercepts are shown on the screen. By Colin Croft. 2003/05/20

 Linear Fit   (details) 38 ENG   21KB/3KB The student nominates what they think is the line of best fit for a set of bivariate data. They can then adjust the line interactively, seeing the effect on the sum of squares of residuals. By Colin Croft. 1998/05/24

 Linear Inequality   (details) 38 ENG   16KB/3KB Graphically solve a linear inequality. By Hewlett-Packard. 1998/06/22

 Linear Programming   (details) 38 ENG   22KB/1KB This aplet visually solves linear programming problems, finding the vertices of the feasible region and the max/min of an objective function. The final stage of finding the vertices is a bit slow but the result is very impressive. It's a wonderful tool for teachers marking test papers - it lets you easily check whether a student's feasible region is correct if they have their constraints wrong. That's why I originally wrote it: sheer frustration after the 20th paper that had to be reworked from scratch to assign part marks. By Colin Croft. 2003/05/20

 Long&Lat   (details) 38 ENG   1KB/2KB Works out the distance of the circle with the given coordinates. Author unknown. 1998/09/06

 Main   (details) 38 ENG   1KB/2KB Tells you the Yint Xint Turning point etc of a line and also expands equations like x2 + 3X + 5 into (X +- ?)(X +- ?). Author unknown. 1998/09/06

 Map the Wrap   (details) 38 ENG   25KB/1KB Investigate the relationship between the unit circle and the graphs of y=sin x and y=cos x. By Hewlett-Packard. 1998/06/22

 Matrix RREF   (details) 38 ENG   19KB/2KB Solve systems of equations using Gauss-Jordan elimination. The student will algebraically manipulate the matrix to put it in row-reduced echelon form (RREF). By Hewlett-Packard. 1998/06/22

 Measurement   (details) 38 FRA   1KB/1KB Principal measurement solver. By Andréas Thillosen. 1998/08/26

 Monte-Carlo   (details) 38 FRA   1KB/1KB Not sure what this is; something about Approx_Int and Approx_PI. Author unknown. 1998/10/28

 Neighbour Function (Dedekind Cut)   (details) 38 ENG   2KB/1KB Programs to do the neighbor function and the Dedekind cut. The neighbor function for a real number N finds the nearest number to N that the calculator can represent. The Dedekind cut returns for real input N the upper and lower nearest numbers to N that the calculator can represent. By Gerald Hillier. 2017/09/29

 Newton-Raphson Iteration   (details) 38 ENG   13KB/2KB School activity designed to investigate the visual representation of the iterative process, and the effects on the iterative process of choosing "unstable" initial values. By Colin Croft. 1998/05/24

 NumTheory38 1.1   (details) 38 DEU   23KB/3KB Group of number theory programs for modulo powering, prime testing and factorizing of integers. Includes Rabin-Miller test and Shanks square form factorization. Full documentation in German. By Gerald Hillier. 2015/07/26

 OEIS A111138   (details) 49/50 38 Prime ENG   5KB/1KB Returns the Nth element of the series OEIS A111138. By Gerald Hillier. 2017/11/20

 Order of Operations   (details) 38 ENG   14KB/1KB Simplify expressions using the order of operations. By Hewlett-Packard. 1998/06/22

 Parallel / Perpendicular   (details) 38 ENG   13KB/4KB Write the equation of a line parallel or perpendicular to a given line through a given point. By Hewlett-Packard. 1998/06/22

 Percent   (details) 38 ENG   12KB/2KB Write ratios that will solve problems of the form A is B% of C. By Hewlett-Packard. 1998/06/22

 Periodic   (details) 38 ENG   46KB/3KB Explore the four different parameters that effect the graph of y=Asin(BX+C)+D and/or y=Acos(BX+C)+D, and will be able to analyze these symbolically and graphically. By Hewlett-Packard. 1998/06/22

 Phase Shift   (details) 38 ENG   13KB/4KB Investigate the parameter C to see how it effects the functions y = sin(x+C), y = cos(x+C), y = tan(x+C), y = sec(x+C), y = csc(x+C), y = cot(x+C). By Hewlett-Packard. 1998/06/22

 Piecewise Functions   (details) 38 ENG   10KB/2KB School activity to teach a student to define and plot 2 piece, 3 piece or 4 piece piecewise-defined functions. By Andy Vella. 1999/03/15

 Point Guess   (details) 38 ENG   11KB/2KB Recognize and name the coordinates of points. By Hewlett-Packard. 1998/06/22

 Polar Equation Plot   (details) 38 ENG   13KB/3KB Graph polar equations and be able to analyze these symbolically and graphically. By Hewlett-Packard. 1998/06/22

 Polar Point Plot   (details) 38 ENG   16KB/4KB Plot points in polar form and convert polar coordinates to rectangular coordinates and vice versa. By Hewlett-Packard. 1998/06/22

 Polynome   (details) 38 FRA   1KB/2KB Solves second degree polynomials. By Andréas Thillosen. 1998/08/26

 Prime Numbers   (details) 38 FRA   1KB/2KB Prime number program. By Andréas Thillosen. 1998/08/26

 Probability Distributions   (details) 38 ENG   23KB/2KB An essential tool for any student going into an exam which involves probability functions. This is two copies of the Solve aplet with equations pre-entered for Discrete and Continuous probability density functions respectively. Covers the Binomial distribution (individual and cumulative), the Poisson distribution (individual and cumulative), the Exponential function, the Normal distribution, plus more. By Colin Croft. 2017/07/26

 QuadForm   (details) 38 ENG   18KB/2KB Determine the nature of the roots, predict how many times, if any, the graph of a parabola will cross the x-axis, and find the solution(s). By Hewlett-Packard. 1998/06/22

 Quadratic   (details) 38 ENG   24KB/3KB Investigate the effects of changing A, H, and K in the vertex form of a quadratic function. Analyze the effect of these parameters symbolically and graphically. By Hewlett-Packard. 1998/06/22

 Quadratic Explorer   (details) 38 ENG   50KB/7KB Very well written HP 38G Aplet. This allows students to investigate the behavior of the graph of y=a(x+h)2+v as the values of a, h and v change. This can be done both by manipulating the equation and seeing the change in the graph, and by manipulating the graph and seeing the change in the equation. By Hewlett-Packard and Colin Croft. 1998/10/10

 Quadratic Focus & Directrix   (details) 38 ENG   12KB/2KB This is an aplet which lets you explore the relationship between the focus and the directrix of a quadratic equation/graph. By Colin Croft. 2003/05/20

 Rational   (details) 38 ENG   23KB/3KB Investigate rational functions and the asymptotes associated with the function. By Hewlett-Packard. 1998/06/22

 RCIS   (details) 38 ENG   1KB/1KB Program to convert complex numbers from Cartesian to polar form. By Colin Croft. 1999/03/15

 Rect   (details) 38 ENG   2KB/1KB Rectangle sums program. By Steve Dunham. 1998/08/26

 Reflection   (details) 38 ENG   17KB/1KB Reflect graphs of functions about the y-axis, x-axis, origin, and the line y=x. By Hewlett-Packard. 1998/06/22

 Residual   (details) 38 ENG   21KB/3KB Compute residual values and display their graph as another way to determine how good the regression equation fits the data. By Hewlett-Packard. 1998/06/22

 Right Triangle Solutions   (details) 38 ENG   3KB/3KB Calculates angles and sides in a right triangle. By Cosmoschtroumph. 2000/04/10

 Right Triangles   (details) 38 ENG   13KB/2KB Solve right triangles by using the Pythagorean Theorem and the trigonometric ratios sine, cosine, and tangent. By Hewlett-Packard. 1998/06/22

 Root Finder   (details) 38 ENG   1KB/1KB Given the coefficients of a polynomial of any degree, it will give you the roots to any desired number of significant figures. If one or more of the roots are complex then it will ignore those and give only the real ones. By Colin Croft. 2017/07/24

 Rounding Drill   (details) 38 ENG   15KB/2KB This aplet which gives the user drill in rounding to a number of decimal places or to a number of significant figures. This is purely a drill program not a teaching aplet. By Colin Croft. 2003/05/20

 Row Operations   (details) 38 ENG   12KB/2KB School activity designed to investigate the use of elementary row operations in the reduction and/or solution of a 3 by 3 system of linear equations expressed as an augmented matrix. By Colin Croft. 1998/05/24

 RSum   (details) 38 ENG   24KB/1KB Calculates the left-hand, right-hand, trapezoid and midpoint Riemann sums which are commonly used to estimate the value of a single definite integral of any reasonably well-behaved real-valued function. By John Courtney. 1998/10/31

 Sequence A002516   (details) 38 ENG   1KB/1KB Generates sequence A002516, the earliest sequence with a(a(n))=2n. By Gerald Hillier. 2017/08/02

 Simulations   (details) 38 ENG   25KB/9KB School activity designed to simulate sets of observations on various discrete and continuous random variables. These can be used in test problems or exercises, or as aids in teaching the topic of random variables. By Colin Croft. 2017/07/25

 Sine   (details) 38 ENG   1KB/1KB Solve a triangle using the Law of Sines. Author unknown. 1998/09/06

 Sine Define   (details) 38 ENG   28KB/2KB School activity designed to investigate the definitions of sine, cosine and tangent on the Unit circle. These can be used in test problems or exercises, or as aids in teaching the topic of random variables. By Colin Croft. 2003/05/20

 Slope   (details) 38 ENG   2KB/1KB Slopefield plotter program. By Steve Dunham. 1998/08/26

 Slope Fields   (details) 38 ENG   15KB/2KB School activity designed to investigate the production of a field of slopes from a derivative function stored in F1(X), and the drawing of multiple possible integrals given starting points (x,y). By Colin Croft. 1998/10/31

 SlopeField   (details) 38 ENG   15KB/2KB Allows you to display a sampled slope field for any 1st order ordinary differential equation of the form dx/dy = f(x,y). By John Courtney. 1997/08/21

 Square Root's Partial Quotients   (details) 38 ENG   2KB/1KB Compute a list of partial quotients of the continued fraction equal to the square root of an integer. By James Donnelly. 1998/05/24

 Substitution   (details) 38 ENG   13KB/7KB Evaluate expressions when given values for the variables. By Hewlett-Packard. 1998/06/22

 Surd Simplifier   (details) 38 ENG   2KB/1KB This is a small but very handy program written by a student who obviously has some interesting ideas. If you enter a surd or an expression involving surds it will return the simplified version. By Dale Shelton. 2003/05/20

 Surface Waves   (details) 38 ENG   16KB/2KB Explore relationships among the data concerning surface waves. By Hewlett-Packard. 1998/06/22

 Sweets Box   (details) 38 ENG   11KB/3KB School activity designed to investigate a problem in optimization where they are required to maximize the volume by manipulating a single variable. By Colin Croft. 1998/05/24

 Tangent Lines   (details) 38 ENG   49KB/2KB School activity designed to investigate the change in the gradient of a tangent line as the point of tangency moves along the function. By Colin Croft. 1998/05/24

 The First 50   (details) 38 ENG   86KB/1+KB This is a collection of small programs you can type in yourself or download. They perform a multitude of small tasks, some that are so easy you'll wonder why I wrote a program for them, some that are really cool. Separated into two parts, because there are too many programs to fit all in the 38's memory at once. Mostly math programs, for numeric, trigonometric, complex, linear, and cubic calculations, plus probability, matrix, finance, statistics, and more. By Colin Croft. 2003/05/20

 Time Series   (details) 38 ENG   22KB/3KB School activity designed to easily and quickly analyze Time Series style data, by calculating moving averages (3, 4 & 5 point), seasonal residuals, trend lines and seasonally adjusted data. It more a working tool, rather than an investigative tool. By Colin Croft. 2017/07/25

 Trailing Zeros of a Factorial   (details) 38 ENG   1KB/1KB Inserts symbolics in the Sequence App to produce the sequence of numbers where the nth digit is the the number of trailing zeros in n!, highest power of 5 dividing n!. This is OEIS A027868. By Gerald Hillier. 2017/09/12

 Transformer   (details) 38 ENG   18KB/2KB This is an easy adaption of the Parametric aplet which allows the student to investigate geometric transformations using 2x2 matrices. It is a fantastic teaching tool - my class deduced all the basic 2x2 transformation matrices for themselves in less than an hour. By Colin Croft. 2017/07/26

 Trig Explorer   (details) 38 ENG   23KB/7KB Very well written HP 38G Aplet. This allows students to investigate the behavior of the graph of y=a sin(bx+c)+d as the values of a, b, c and d change. This can be done both by manipulating the equation and seeing the change in the graph, and by manipulating the graph and seeing the change in the equation. By Hewlett-Packard and Colin Croft. 1998/10/10

 Vecteur   (details) 38 FRA   1KB/2KB Vector calculation program. By Andréas Thillosen. 1998/08/26

 Vector Derivatives   (details) 38 ENG   15KB/2KB School activity designed to investigate the relationship between the position, velocity and acceleration vectors for functions defined in the form (x(t),y(t)). By Colin Croft. 1999/03/15

 VOL/SA1   (details) 38 ENG   13KB/2KB Calculate volumes and surface areas for the three dimensional shapes of the pyramid and the cone. By Hewlett-Packard. 1998/06/22

 VOL/SA2   (details) 38 ENG   17KB/2KB Calculate volumes and surface areas for three dimensional shapes of the box and the cylinder. By Hewlett-Packard. 1998/06/22

 WindFix   (details) 38 ENG   1KB/2KB Adjusts axes to nice values so cross-hair 'jumps' are to useful points rather than horrible decimals. Trig gives \pi fractions. Similar to Function Plus, but a program instead of an aplet, requiring less memory. By Colin Croft. 2003/05/20

 Year 12 Applicable Mathematics   (details) 38 ENG   8KB/1+KB Various math aplets for Applicable Math, including Binomial Approximation, Linear System Solver, matrix tools, and more. By Quin Pendragon. 1999/03/15

 Year 12 Calculus   (details) 38 ENG   6KB/1+KB Various math aplets for Calculus, including Small Increments, polynomial division, trigonometric functions, and more. By Quin Pendragon. 1999/03/15

Part of the HP Calculator Archive,
Copyright 1997-2017 Eric Rechlin.