Assigning values to vectors of different lenghts

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Hello,
I've got three vectors, say a(1x4), b(1x4) and c(1x10). Vectors a and c represent the same thing, they are just codes. Vector b let's say it's my objective function.
a = [1 2 3 4]
b = [0.1 0.2 0.3 0.4]
c= [ 4 4 4 2 2 1 3 3 1 4].
I want to get another vector d, which will have the same dimensions as vector d (10x1) and in which the values of vector b will be assigned.
d should be like d = [0.4 0.4 0.4 0.2 0.2 0.1 0.3 0.3 0.1 0.4].
Any thoughts on this?
Many thanks

Accepted Answer

Konstantinos Sofos
Konstantinos Sofos on 27 Mar 2015
Edited: Konstantinos Sofos on 27 Mar 2015
Hi,
if your starting point is that you have a and c you can make d from b as
[~,idx] = ismember(c,a);
d = b(idx);
>> d
d =
0.4000 0.4000 0.4000 0.2000 0.2000 0.1000 0.3000 0.3000 0.1000 0.4000

More Answers (1)

Jon
Jon on 27 Mar 2015
It's not clear what you need a for. You can make d directly from c and b as follows:
>> d=b(c)
d =
0.4 0.4 0.4 0.2 0.2 0.1
0.3 0.3 0.1 0.4

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