I want to interpolate the values inside one column. Using Matlab -

the matrix looks this:

0   0 0.1 0 0.2 0  0.3 5 0.4 0 0.5 0 0   0 0.1 0 0.2 6 0.3 0  0.4 0 0.5 0 

as can see simple matrix (x,y), want linearly interpolate values of column 2. how can ?

using interp1 linear , extrap option

%// taking non-zero rows b = a(all(a,2),:)  %// performing linear interpolation on first column of 'a' 'interp1' out = interp1(b(:,1),b(:,2),a(:,1),'linear','extrap') 

results:

b =  0.3000    5.0000 0.2000    6.0000  out =  8.0000 7.0000 6.0000 5.0000 4.0000 3.0000 8.0000 7.0000 6.0000 5.0000 4.0000 3.0000 

if want them x values

out = [a(:,1),out] 

you get

out =       0    8.0000 0.1000    7.0000 0.2000    6.0000 0.3000    5.0000 0.4000    4.0000 0.5000    3.0000      0    8.0000 0.1000    7.0000 0.2000    6.0000 0.3000    5.0000 0.4000    4.0000 0.5000    3.0000