# 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)

Clemens Gersch on 16 Sep 2020
Quite a "think outside of the box" idea. I know interp1, but would have never got to the point of using it in this constellation.
Works fine, thanks.
jonas on 16 Sep 2020
My pleasure!
It makes sense if you think of your translation vectors as a function.

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