Creates a new pop-up window where you can choose to enter a new matrix or preform a matrix op.
Choose to enter a new matrix and you will be shown a screen where you can enter the size of the matrix
After you enter the size of the matrix gcalcrpn creates a mini-spreadsheet the size of your matrix for you to enter the matrix. Enter the matrix here and press OK when you are done.
Pressing OK here will place the matrix on teh stack!! pressing cancel at any time in this process will just abort the process and return you to the main window.