>If I remember correctly from my Linear Algebra >classes, in order to multiply two arrays, their >dimensions have to be such that the first dimension of >the second array equals the second dimension of the >first array, so they should be of the sort: > Array1 [m x n] and Array2 [n x p] >which means that, in this case, as it's not a square >array, it can't multiply it with itself. >Try again wih a square array.
Thanks! Now it all makes sense and works the way it should. Another question about matrixMultiply in Rev: According to the entry in the Transcript dictionary for the operator "*", we should be able to multiply matrices by using the * operator instead of the matrixMultiply() function. I'm trying it with a 4 x 4 array, so it should work, but using the * operator yields different results from matrix multiply. Here's the example I'm using. The following text is read into a 4 x 4 array variable with numeric keys, named outputArray 1 0 1 1 1 1 0 0 1 0 1 0 0 1 1 0 Next, I want to multiply this array by itself: put outputArray * outputArray into productArray or put matrixMultiply(outputArray,outputArray) into productArray The first example, using * yields an incorrect answer: 1 0 1 1 1 1 0 0 1 0 1 0 0 1 1 0 The second, using matrixMultiply yields the correct answer: 2 1 3 1 2 1 1 1 2 0 2 1 2 1 1 0 So, why didn't the * operator produce the correct answer? It did work, for the simpler case of multiplying a number times a matrix, but not for a matrix times a matrix. _______________________________________________ use-revolution mailing list [EMAIL PROTECTED] http://lists.runrev.com/mailman/listinfo/use-revolution
