read many matrices

• Nov 10, 2004

• #2

IRstuff

Aerospace

Jun 3, 2002

44,899

US

The simplest thing is probably to read in the whole thing as a single matrix and then use submatrix to extract the smaller matrices; should work well if they're sized the same.



TTFN

 

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• Nov 10, 2004

• #3

Bung

Electrical

Feb 10, 2002

428

AU

Or you could suck the data into something like Excel, divide up the matrices there using Excel's functionality, and use the automation components to get the matrices from Excel into Mathcad.


Bung
Life is non-linear...

 

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• Nov 11, 2004

• Thread starter
• #4

peter2

Civil/Environmental

Nov 10, 2004

11

IT

for irstuff:
the output can have up to 20000 matrices
(dimension 100 X 100).
do you think it would stil be possible to do what you are saying? how?

for bung:
actually i was looking for a complete automatica program (wich can possibly export a .AVI file)....too much?

thank you very much everybody.

any other suggestion?

peter

 

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• Nov 11, 2004

• Thread starter
• #5

peter2

Civil/Environmental

Nov 10, 2004

11

IT

i made it.
thank you irstuff.... i used your method and works fine....

do you know to force mathcad to continue reading the matrix even after a blank line in the input file?

do you think mathcad will hang if i use a too big file?

thanks again

peter

 

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• Nov 11, 2004

• #6

IRstuff

Aerospace

Jun 3, 2002

44,899

US

not sure about the first Q.

there are limits to Mathcad's ability to handle matrices, at least with the older versions, beyond that of just having enough memory.

TTFN

 

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• Nov 12, 2004

• Thread starter
• #7

peter2

Civil/Environmental

Nov 10, 2004

11

IT

form mathcad help:
"The effective array size limit depends on the memory available on your system. Approximately 8 bytes of memory are needed per array element. For most systems, the array limit is at least 1 million elements. In no system is it higher than 8 million elements."

i think it will be enough...
bye

PS i will post my solution to the problem later(if anyone's interested...)

 

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• Nov 12, 2004

• Thread starter
• #8

peter2

Civil/Environmental

Nov 10, 2004

11

IT

I defined my matrix as (i
FRAME:1..kmax
B(FRAME):=submatrix(M,(FRAME-1)*imax,FRAME*imax-1,0,jmax-1)
^
|___ This is a subscript!

then i put it in a 3d bar plot and it shows me all the matrices like an animation but not fluid (i'ev fixed my axes limits). when i open the animate dialog box i'm not able to drag the plot into the box and when i click on animate button it says "error initializing video stream".
can anyone help me?
thanks

 

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• Nov 15, 2004

• Thread starter
• #9

peter2

Civil/Environmental

Nov 10, 2004

11

IT

noone can?
.....

 

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• Nov 15, 2004

• #10

IRstuff

Aerospace

Jun 3, 2002

44,899

US

If you post your file on the Mathcad website, someone may be able to at least tell if it's a problem with your system or your file:

http://collab.mathsoft.com/~Mathcad2000

TTFN

 

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