interpolation when X does not equal V, lookup function

I want to sample my data (V) at the sampling positions specified in X. Target contains the coordinates of the V values. X is a set of increasing values. If X is not found in target, then interpolation is used to calculate the V value. Target is same length as V. So we might have:

X=[5.5 10 13]

V=[1 2 3 4 5 6 7]

target=[2 4 6 8 10 12 14]

So the X values are looked for in target, and linear interpolation is used to provide a V value at the same index in V, hence:

desired output = [2.75 5 6.5]

I thought this would be a job for interp1 but it is not because X and V are not equal, i.e. output=interp1(X,V,target); X will always be within the range of target and V and target will always be the same length. Am I missing something simple here?

Answer 1

[Fangjun Jiang]

>> interp1(target,V,X)

ans =

      2.7500    5.0000    6.5000

[Swisslog]

Thanks - I was indeed missing something simple