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Interpolation function in v4

Posted Aug 12, 2010, 7:59 p.m. EDT Version 4.1 5 Replies

Andre Teves
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Hi all,

In COMSOL v3.5 I use the following commands to define interpolation functions from matlab. However I could not find a way to do the same thing in v4. Is creating a file (spreadsheet, grid, sectionwise) the only way to do this in v4?

Thanks a lot,
Andre

-----


fcns{1}.type='interp';
fcns{1}.name='rho_design';
fcns{1}.method='linear';
fcns{1}.extmethod='const';
fcns{1}.defvars='true';

cellX = cell(1,m);
for i=1:m
cellX{i} = num2str(x(i));
end

cellY = cell(1,n);
for i=1:n
cellY{i} = num2str(y(i));
end

cellF = cell(1,m*n);
for i=1:m*n
cellF{i} = num2str(F(i));
end

fcns{1}.x = cellX;
fcns{1}.y = cellY;
fcns{1}.data = cellF;
5 Replies Last Post Apr 10, 2012, 11:08 a.m. EDT
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Hello Andre Teves

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Abdellah Ousegui
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Posted: 1 decade ago Oct 31, 2011, 5:10 p.m. EDT
hello
did you resolve the problem?
I've the same difficulties
thx
hello did you resolve the problem? I've the same difficulties thx
Jim Freels mechanical side of nuclear engineering, multiphysics analysis, COMSOL specialist
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Posted: 1 decade ago Oct 31, 2011, 8:56 p.m. EDT
Just use the built-in function generator of v4+. You can define an equation or read from an external file. No need for MATLAB unless you just want to use it.
Just use the built-in function generator of v4+. You can define an equation or read from an external file. No need for MATLAB unless you just want to use it.
Armando Felix
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Posted: 1 decade ago Feb 17, 2012, 3:42 a.m. EST

Hi all,

In COMSOL v3.5 I use the following commands to define interpolation functions from matlab. However I could not find a way to do the same thing in v4. Is creating a file (spreadsheet, grid, sectionwise) the only way to do this in v4?

Thanks a lot,
Andre

-----


fcns{1}.type='interp';
fcns{1}.name='rho_design';
fcns{1}.method='linear';
fcns{1}.extmethod='const';
fcns{1}.defvars='true';

cellX = cell(1,m);
for i=1:m
cellX{i} = num2str(x(i));
end

cellY = cell(1,n);
for i=1:n
cellY{i} = num2str(y(i));
end

cellF = cell(1,m*n);
for i=1:m*n
cellF{i} = num2str(F(i));
end

fcns{1}.x = cellX;
fcns{1}.y = cellY;
fcns{1}.data = cellF;


Hello Andre,

Were you able to find a solution that did not imply reading the data from a text file?

Regards,
Armando
[QUOTE] Hi all, In COMSOL v3.5 I use the following commands to define interpolation functions from matlab. However I could not find a way to do the same thing in v4. Is creating a file (spreadsheet, grid, sectionwise) the only way to do this in v4? Thanks a lot, Andre ----- fcns{1}.type='interp'; fcns{1}.name='rho_design'; fcns{1}.method='linear'; fcns{1}.extmethod='const'; fcns{1}.defvars='true'; cellX = cell(1,m); for i=1:m cellX{i} = num2str(x(i)); end cellY = cell(1,n); for i=1:n cellY{i} = num2str(y(i)); end cellF = cell(1,m*n); for i=1:m*n cellF{i} = num2str(F(i)); end fcns{1}.x = cellX; fcns{1}.y = cellY; fcns{1}.data = cellF; [/QUOTE] Hello Andre, Were you able to find a solution that did not imply reading the data from a text file? Regards, Armando
Andre Teves
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Posted: 1 decade ago Feb 17, 2012, 4:18 p.m. EST
No, I'm still using a text file to comunicate with COMSOL. But that works fine for me!
No, I'm still using a text file to comunicate with COMSOL. But that works fine for me!
Akram Hajebifard
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Posted: 1 decade ago Apr 10, 2012, 11:08 a.m. EDT
In 4.2a there is a Interpolation, maybe it works for you.
Model>Definitions>Functions>Interpolation
In 4.2a there is a Interpolation, maybe it works for you. Model>Definitions>Functions>Interpolation

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