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

[Stephen23]

"i have n number of vectors..."

Note that accessing variable names in a loop is slow, complex, buggy, and hard to debug:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Putting these vector into one cell array would mean you could trivially loop over them all using a for loop and indexing, which is simple, intuitive, and very efficient.

Answer 1

[Stephen23]

>> vec1 = [3 5 2 1];
>> vec2 = [4 5 3 4 3 1 4];
>> xo1 = 1:numel(vec1);
>> xo2 = 1:numel(vec2);
>> xi1 = linspace(1,numel(vec1),10);
>> xi2 = linspace(1,numel(vec2),10);
>> interp1(xo1,vec1,xi1)
ans =
            3       3.6667       4.3333            5            4            3            2       1.6667       1.3333            1
>> interp1(xo2,vec2,xi2)
ans =
            4       4.6667       4.3333            3       3.6667       3.6667            3       1.6667            2            4

"i have n number of vectors ..."

When you put them into one cell array then you can trivially loop over all of them:

C = {[3 5 2 1], [4 5 3 4 3 1 4], ...};
D = cell(size(C));
for k = 1:numel(C)
   N = numel(C{k});
   xo = 1:N;
   xi = linspace(1,N,10);
   D{k} = interp1(xo,C{k},xi);
end

[WEEKIAN SOH]

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[Stephen23]

@WEEKIAN SOH: I am glad you like num2words. If you have the time please add a comment and rating at the bottom of the FEX page, so that you can tell others that you found it useful.