# How to replace numbers in one vector according to two 'translation vectors'

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Clemens Gersch on 16 Sep 2020
Commented: jonas on 16 Sep 2020
Hi,
I probably just googled for the wrong terms as this seems to be a very common problem.
I have a vector A that needs to be translated into the vector D according to the rules set in vectors B and C.
A = [3; 5; 8];
B = [3; 4; 5; 7; 8];
C = [1; 2; 3; 4; 5];
D = ?
B and C say, how the translation works. Example 1: a 3 in A must become a 1 in D. Example 2: a 7 in A (although there isn't any, but if there were) must become a 4 in D.
So the solution for D must be [1; 3; 5]. How can I get there?

jonas on 16 Sep 2020
Edited: jonas on 16 Sep 2020
D = interp1(B,C,A)
##### 2 CommentsShowHide 1 older comment
jonas on 16 Sep 2020
My pleasure!
It makes sense if you think of your translation vectors as a function.

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