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Wiring Two Arrays to the Multiply Function Does Not Result in Correct Matrix Multiplication

Primary Software: LabVIEW Development Systems
Primary Software Version: N/A
Primary Software Fixed Version: N/A
Secondary Software: N/A

Problem: If I wire two arrays (or vectors or one of each) to the Multiply function, the output does not reflect proper matrix multiplication.

Solution: The Multiply function performs simple multiplication, not matrix multiplication. Instead, the function performs per-element multiplication and multiplies the elements in one array by the corresponding elements in the other array.

For example, if the first element of array A is 4 and the first element of array B is 2, wiring these two arrays to the Multiply function results in an array that is the same size as A and B whose first element is 8 (4*2). If you want to multiply two matrices to get the correct matrix multiplication, you must use either the A x B VI for two matrices, or the A x Vector VI to matrix multiply a matrix and a vector.

Note: To locate these VIs, click the Search button on the Functions palette toolbar.

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Report Date: 01/09/1999
Last Updated: 02/18/2005
Document ID: 1H8GIHG4

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