MATLAB: Rearrange an array based on another array

arrayMATLAB

Hi, given the following array
SPI = [1  2   3   4   5  6   7   8   9   10  11  12  13];
VI = [ 5  20  10  15  5  20  10  15  10  15  20  10  5 ];
each value of SPI has a corrispondent value in VI. 1-5 , 2-20 , 3-10 and so on
I have obtained now a new vector SP with all the values that were in SPI
SP = [9 3 11 7 4 2 13 12 8 10 5 6 1]
And I want to obtain a new vector V where I have the corrispondent values of VI for each element of SP.. so:
V = [10 10 20 10 15 20 5 10 15 15 5 20 5]
May someone can help me?

Best Answer

General solution:
>> [~,idx] = ismember(SP,SPI);
>> V = VI(idx)
V =
   10   10   20   10   15   20    5   10   15   15    5   20    5
Solution specifically for your example SPI which is defined as 1:numel(VI):
>> V = VI(SP)
V =
   10   10   20   10   15   20    5   10   15   15    5   20    5
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