MATLAB: How to make group by extracting data

#enumerategroupMATLAB

Hello,
e = [-9:3:9];
CM =
0.41 0.39 0.37 ….
0.32 0.30 0.29 …
0.24 0.22 0.20 …
0.15 0.13 0.12 ….
0.06 0.05 0.03 …
-0.01 -0.03 -0.05 …
-0.10 -0.12 -0.13 …
CM is 7*20 double,
and
ele1 = interp1(CM(:,1),e,0);
ele2 = interp1(CM(:,2),e,0);
….
ele20 = interp1(CM(:,3),e,0);
ele = [ele1 ele2 ….. ele20]
This method have to write each group, so I want to make it more simply
(I just want to result 'ele = [ele1 ele2 … ele20]', I don't need to enumerate all components)
Thanks for reading.

Best Answer

I am not certain what you want to do. One problem is that the elements of ‘CM’ appear to be outside the range of (-9,9). In any event, the first argument must be a vector. If you want to do the interpolation in the order of arguments you chose, a loop is the only option: 
CM = sort(randi([-9 9], 7, 20)+rand(7,20),2)/10;                        % Create ‘CM’
e = [-9:3:9];
for k = 1:size(CM,2)
    ele(k) = interp1(CM(:,k),e,0, 'linear','extrap');
end
.
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