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Efried1-Visitor
1-Visitor
January 29, 2013
Question

Memory Control

  • January 29, 2013
  • 2 replies
  • 2578 views

Hello,

before crippling my programm allow me to ask whether there is a way to determine how close mathcad comes to the internal memory limit.

many thanks

2 replies

E
Efried1-VisitorAuthor
1-Visitor
January 29, 2013

I just see that some duplication of variables is done in the first part of the programm, where dimensionless variables are handed over to the programm, because of mathcad restritions. The new variables ist identical but has units. May be there is a better way to do that?

Since mathcad uses also external variables in programms, does it help to use external variables? My problem is then that they vary in size.

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Fred_Kohlhepp23-Emerald I
23-Emerald I
January 29, 2013

You will get a better response if you post an example of what you're doing. (Select "Use advanced editor" in the upper right corner of the reply box to be allowed to attach a file.)

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Efried1-VisitorAuthor
1-Visitor
February 4, 2013

ok here is the symbolic problem - the real one has some MB.

thanks in advance

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Efried1-VisitorAuthor
1-Visitor
February 5, 2013

The issue got more urgent- What is causing this "system memory exception"?

  1. plots having lots of things to draw - memory consumption is depending on the style of the plot not too?
  2. large arrays/vectors - what is the best method to pack variable using minimum memory having a vector of mixed matrices?
  3. calls to programms having local variables - May local variables pre-defined outside the programm save on memory?

thanks for your hints

Gerfried

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Fred_Kohlhepp23-Emerald I
23-Emerald I
February 5, 2013

Gerfried;

I try to avoid programming when I can; it's messy, and hard to read. If you're using units then trying to pass two variables with different units out of a program becomes difficult, as you saw.

It's not clear from your example what you're doing, I don't understand why you have two indices (i and j), the example doesn't need them.

Your example doesn't show what causes the memory issue (except for the nested arrays?)

I don't know how to help further without more information; maybe a full program with fewer than ten thousand numbers?

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