Programming HP Calculators/Commands/Matrix Commands

ADDCOL/ADDROW DELCOL/DELROW EDITMAT Syntax EDITMAT <matrix>: Detail Opens the edit matrix screen, allowing the user to input data into a matrix. <matrix> can be one of the ten matrix variables from M0 to M9. Essentially the same as PROMPT - but used for matrix input. Example MSGBOX "This program multiplies two matrices.": MSGBOX "Please enter the first matrix.": EDITMAT M1: MSGBOX "Please enter the second matrix.": EDITMAT M2: M1*M2?M3: MSGBOX "The result of the multiplication is stored in M3." This program will multiply two matrices, as detailed in the MSGBOX commands. RANDMAT Syntax RANDMAT <matrix>;<#rows>;<#columns>: Detail Generates a matrix in variable <matrix> of size <#rows> x <#columns>, setting each element to a random integer (apparently) from -9 to 9, inclusive. Essentially the same as PROMPT - but used for matrix input. Example RANDMAT M1;50;50: Makes a really big matrix filled with random integers that wastes a fair bit of your calculator's memory, as well as drains the batter power writing all that info to memory. Useful! REDIM REPLACE SCALE Note: This information was obtained via trial and error and may be incorrect, pending verification. Splintax 12:57, 8 February 2006 (UTC) Syntax SCALE <matrix>;<factor>;<row>: Detail Multiplies all elements in the row <row> of matrix <matrix> by scalar <factor>. Example [[1,2],[3,4]] |STO| M1: SCALE M1;5;1: EDITMAT M1: Generates the 2x2 matrix with [1 2] on the top and [3 4] on the bottom row, then multiplies the top row (row 1) by 5 to make it [5 10]. SCALEADD Note: This information was obtained via trial and error and may be incorrect, pending verification. Splintax 13:03, 8 February 2006 (UTC) Syntax SCALEADD <matrix>;<factor>;<rowa>;<rowb>: Detail Adds each element of <rowa>, multiplied by <factor>, to each element of <rowb>. Example [[1,2],[3,4]] |STO| M1: SCALEADD M1;5;1;2: EDITMAT M1: Generates the 2x2 matrix with [1 2] on the top and [3 4] on the bottom row, then adds the top row multiplied by 5 (that is, [5 10]) to the bottom row to produce [8 14]. SUB SWAPCOL/SWAPROW