Gerardo V. Lozada

First Name:Gerardo V.
Last Name:Lozada
Last Change:2020-12-30
Number of Files:9 (166th most prolific)
Number of Downloads:16,031 (717th most downloaded)

3D Parametric Function Plotting 1.0   (details) Prime ENG   173 KB / 7 KB
ScreenshotPlots a colored 3-dimensional parametric equation on an HP Prime of the form z=(t,u) where t and u are angular parameters in degrees, generally varying from zero to 360 degrees. Your Prime must be set to Degrees mode in both CAS and Home. The program will also ask for the number of slices in t and u, I generally use 40 for both. The viewing angle for the sample plot is 5 degrees for the x-axis and 25 degrees for the z-axis. There are sample functions for a toroid (doughnut), sphere, orbital (modulated sphere) and spirals. The program is based on an old Byte magazine article discussing the mathematical principles behind 3D plotting.
By Gerardo V. Lozada. 2015-07-26

3D XYZ Function Plotter 1.1   (details) Prime ENG   1 KB / 3 KB
Plots 3-dimensional functions of the form f(X,Y), such as f(X,Y):=(-(X^2+Y^2));.
By Gerardo V. Lozada. 2014-10-18

Backward Sweep/Forward Sweep Radial Loadflow 1.2   (details) 49/50 ENG   37 KB / 32 KB
Backward sweep/forward sweep radial loadflow program suitable for radial 3-phase power distribution lines. Calculates per-unit (p.u.) node voltages and MW/MVAR and MVA line segment flows on a radial distribution feeder. Written in HPGCC; requires HPGCC ARM ToolBox, and only runs on the 49g+ and 50g.
By Gerardo V. Lozada. 2008-05-11

Complex Roots Of Multiple Non-Linear Equations   (details) 48 ENG   3 KB / 1 KB
Computes the real and complex roots of a system of simultaneous non-linear equations using the Newton-Raphson Method utilizing the forward difference method to approximate the Jacobian matrix.
By Gerardo V. Lozada. 2018-03-14

Determine Circle From Three Given Points   (details) 49/50 48 ENG   45 KB / 1 KB
Given three points in the form X1, Y1, X2, Y2, X3, Y3, this calculates the circle's center and radius.
By Gerardo V. Lozada. 2018-07-22

Determine If Number is Prime or Composite   (details) 49/50 48 ENG   3 KB / 1 KB
ScreenshotDetermines whether a number is prime or composite, and if composite, lists the largest factors.
By Gerardo V. Lozada. 2020-12-30

Gauss-Seidel Loadflow Program 1.0   (details) 49/50 ENG   47 KB / 45 KB
Computes bus voltages and line/transformer power flows using the Gauss-Seidel Loadflow algorithm. Written in HPGCC C and requires the ARM runtime toolbox installed (SETUP.BIN included in zip file) to run and an SD card. Install program invokes ARM toolbox S->EXE and moves stand-alone executable to SD card (port 3). Sample bus and line/transformer data included. For the 49g+ and 50g only.
By Gerardo V. Lozada. 2009-11-28

Multiple Linear Regression Program 1.1   (details) 49/50 ENG   32 KB / 22 KB
Performs multiple linear regression and dumps output data on the stack. Written for the HP 50g (will also run on the 49g+) using the HPGCC C cross-compiler on a Windows PC and requires the ARM ToolBox SETUP.BIN (included in the zip file for the downloader's convenience). See the PDF documentation for insturctions in installing the ARM Toolbox on your calculator. This updated version (1.1) incorporates a check to ensure that the number of given points to be entered is greater than the number of independent or X variables to prevent an invalid non-unique solution.
By Gerardo V. Lozada. 2008-05-11

Shoelace Method   (details) 49/50 48 ENG   42 KB / 1 KB
Uses the Shoelace method to calculate the area of an irregular polygon.
By Gerardo V. Lozada. 2018-07-22

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