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Interpolation function in v4

Posted 12 août 2010, 19:59 UTC−4 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 10 avr. 2012, 11:08 UTC−4
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Hello Andre Teves

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If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Abdellah Ousegui
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Posted: 1 decade ago 31 oct. 2011, 17:10 UTC−4
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 31 oct. 2011, 20:56 UTC−4
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 17 févr. 2012, 03:42 UTC−5

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 17 févr. 2012, 16:18 UTC−5
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 10 avr. 2012, 11:08 UTC−4
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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