for loop help with loop range

I nedd help with the following:

Thank you!

[dpb]

How do you intend to hold the disparate output size of either three (3) or two (2) return values?

This seems exceedingly awkward construct; I'd suggest instead an array of Nx3 with a missing value for those without a z coordinate.

Otherwise, how are these to be used later on -- should they not be the same variable because they are three disparate quantities, not one (or maybe there are two)?

Answer 1

[dpb]

" extract data of the first 3 columns (x,y,z) for sensorIdx 1,2,5,6,7. For sensorIdx 3 and 4 I want to extract columns 5,6 (x,y) and 7,8 (x,y) respectively."

ch_xyz=1:3;
id_xyz=[1 2 5:7];
xyz=data(id_xzy,ch_xyz);
ch_xy=[5 6;7 9];
id_xy=[3; 4];
xy=cell2mat(@(i) data(id_xz(i),ch_xy(i,:),1:numel(id_xy),'uni',0).');