Inverse problem LabWindows

I have a program LabWindows which reads in the values of a 2D array, and then calculates the inverse by using InvMatrix.  My problem is that I don't know until the program starts how many values will be read in.  So I declare my matrix to be large enough to handle the maximum number of values, there could be.  Then, when I call InvMatrix, I get an error matrix is singular because the table has rows and columns of all zeros.  I know that the InvMatrix function has an entry for the size of the matrix, but the definition of this value to the size of the part not null matrix does not seem to solve the problem.  Any ideas how I can get around this?  Thank you!

Short answer: you want to dynamically allocate the matrix account to your row/column settings.

Long answer: dynamic allocation of 2D matrices is a little sensitive in c (especially since you don't know anything about what the CVI function is expecting in terms of the structure of the memory for the table).  If the CVI executes optimized assembler matrix waiting for a statically-allocated array, you may have to simulate the index layout and "flatten" your 2D matrix.  If you want all the details, you should check:

http://c-FAQ.com/aryptr/dynmuldimary.html

If you enable the C99 extensions in CVI, you might be able to take advantage of variable length arrays by allocating the table wished at run time.  I believe in memory, it will look like a standard static matrix structure, although I don't have much experience with C99 VLAs.

Tags: NI Software

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