how to increase the number of samples in a vector using interpolation

i have n number of vectors each having different number of samples. It is required to have the same number of samples in each vector. how can i do this using interpolation. for example vec1= [3 5 2 1]; vec2=[4 5 3 4 3 1 4] ; i required that vec1 and vec2 should be of same length say 10 please help

[stud]

earlier the question was posted by me .. just reframed the question with an example to make it more clear