MATLAB: How can i extract parameters from a vector at specific values

compareparameters

Hi everyone,
i looking for a way to get in a new vectore 'D' , values of a vectore 'A' when the values of B are equal to the values of C
lets say i have A = [1,2,3,4,5,7,8,9,10]
and B =[11,12,13,14,15,16,17,18,19,20] ; both A and B of the same lenght,
i want to compare B with a new vector C = [11,15,20]
that returns values in A when B=C
expected output D=[1,5,10]

Best Answer

Use ismember:
>> A = 1:10
A =
    1    2    3    4    5    6    7    8    9   10
>> B = 11:20
B =
   11   12   13   14   15   16   17   18   19   20
>> [idx,idy] = ismember(C,B);
>> D = A(idy(idx))
D =
    1    5   10
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