Is there a standard way to allow X-Math to use more memory or CPU power

[wimreduct]

I have written my program under linecode. When my input data files (simple csv format) are around 1 Mb the program runs OK, but when the size of the input file increases to 4 or 8 Mb, XMath crashes halfway the calculation process. It notifices that an internal error has occured and that I should consider saving my work, which is then not possible anymore. Is there a standard way to increase memory usage, because I am not using my total mamory capacity yet.

[Carl L.]

Xmath allocates memory as it is needed. You do not need to specify amount memory that will be used.

What version of MATRIXx are you using? What OS?

What kind of functions are you calling? It would be useful to narrow down which function call produces the error. One way is by adding display commands in the MathScript. That way you can tell how far it runs before the error.

If you have the MathScript available I could try running it here to see if I get the same error.

Carl L
National Instruments

[wimreduct]

The problem is that it doesn't happen all the time. Let's say 3 out of 10 tries.
Our version is Mx70.1
OS : Windows 2000 (running as network OS)

It happens when we call these functions
sys1 = FIRwind(11,0.1,timestep,{lowPass,Hamming,zeroPhase});
SAyz0 = filter(sys1,Ayz0);
SAyz1 = filter(sys1,Ayz1);
SAyz2 = filter(sys1,Ayz2);
sys1 = FIRwind(11,0.1,timestep,{lowPass,Hamming,zeroPhase});
SAx = filter(sys1,Ax);

[Carl L.]

If it runs successfully will it then run again successfully or is it only on the first run after increasing the data size that it crashes? What are the sizes of AyzX and Ax?

How much RAM do you have on the system?

If it is a question of acquiring memory, you can create a dummy variable and then delete it. For example
temp = zeros(100000,1)
delete temp
MATRIXx will then acquire the memory, but does not return it to the OS when the variable is deleted. Instead the memory remains availble for other variables.

Carl L
National Instruments