Output Comsol result from Matlab

Please help: I have a model in Comsol. I want to output y displacement result at some points [73 74 113 114 151 154 191 194 229 234 269] in the model. But the code is outputing the displacement in the entire domain.

model.result.create('pg5', 'PlotGroup1D');
model.result('pg5').run;
model.result('pg5').create('ptgr1', 'PointGraph');
model.result('pg5').feature('ptgr1').selection.set([73 74 113 114 151 154 191 194 229 234 269]);
model.result('pg5').feature('ptgr1').set('expr', 'v');
model.result('pg5').feature('ptgr1').set('descr', 'Displacement field, Y component');
model.result('pg5').run;

model.result.export.create('data1', 'Data');
model.result.export('data1').set('expr', {'v'});
model.result.export('data1').set('descr', {'descr', 'Displacement field, Y component'});
model.result.export('data1').set('filename', 'xl_disp.txt');
model.result.export('data1').run;

pause(2)
load xl_disp.txt
save('xl_disp','xl_disp')
load('xl_disp','-mat','xl_disp')

Also, I tried this:

mpheval(model, 'expr', 'v', '[73 74 113 114 151 154 191 194 229 234 269]')

But it did not work.

Thank you.

[Shengjiang QUAN]

This is a 5-year late reply. Just record here for newcomers.

TL;DR

Use command `mphinterp`.

u=mphinterp(model,'u','dataset','cpt1');

Details

I encountered the same problem at the day of writing. In my case, I need the displacement components (u and v) at pre-defined 3D cut points with tag "cpt1". As shown in this figure.

Please pay attention to the first entry of `Properties`. This means that the results of `cpt1` dataset would be calculated based on `dset2`. And the results of `dset2` is calculated by keypoints generated by meshgrid. Please check this video to see more details.

And the method to calculate `cpt1` based on `dset2` is -- interpolation.

Thank you.