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The *row+( adds a multiple of one row to another row and returns the result. It is an elementary row operation used in Gaussian Elimination.
[[1,2][3,4]] [[1 2] [3 4]] *row+(10,Ans,1,2) [[3 4 ] [31 42]]
You can add columns instead of rows with the aid of the T (Transpose) command.
- ERR:INVALID DIM is thrown if one of the row arguments isn't a valid row (larger than the matrix size, or otherwise bad)