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 Volume integral code		  New Topic  Reply to Topic
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nosrak

USA
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Posted - 06/21/2007 :  4:55:26 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
I need to do an integration of a matrix in x and y, exactly like the integrate function in the matrix menu:
"Origin performs a double integral over X and Y to compute the volume and reports the value in the Script window."

Can I get to this function in originC? If not any help writing the correct functions would be appreciated.
thanks

Mike Buess

USA
3037 Posts
Posted - 06/22/2007 :  08:38:41 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Matrix> Integrate runs the [Integrate] section of the script file Matrix.ogs. (Press Ctrl+Shift while you select a menu item and the script that executes the command will open in CodeBuilder.) You can run that script from OC code with LT_execute("run.section(Matrix,Integrate)"). If you want the complete OC code for the same thing you can use this...

int integrate_matrix()
{
MatrixLayer mm = Project.ActiveLayer();
if( !mm ) return -1;
mm.LT_execute("matrix -id");
using mat = LabTalk.mat;
mat.matname$ = mm.GetPage().GetName();
mat.integrate("ii");
double dVol;
LT_get_var("ii",&dVol);
using type = LabTalk.type;
type.BeginResults();
string str;
str.WriteLine(WRITE_OUTPUT_LOG);
str.Format("Integration of %s from zero is %g",mat.matname$,dVol);
str.WriteLine(WRITE_OUTPUT_LOG);
type.EndResults();
return 0;
}

Mike Buess
Origin WebRing Member
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nosrak

USA
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Posted - 06/23/2007 :  1:27:25 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks that was what I needed. Next question: i'm using this to create a matrix:

MatrixPage mPage;
mPage.Create("Origin");
Matrix mat;
mat.Attach(mPage.GetName());

How do I set the coordinates of the columns and rows? I need them to be set the same as my matrix size to get the proper integral.

Edited by - nosrak on 06/23/2007 1:28:02 PM
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Mike Buess

USA
3037 Posts
Posted - 06/23/2007 :  3:23:48 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
mat.SetXMax(maximum X value);
mat.SetXMin(minimum X value);
mat.SetYMax(maximum Y value);
mat.SetYMin(minimum Y value);

Mike Buess
Origin WebRing Member
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