CODEWITHSUNDEEP
rmatlab
Experimental Psychologist
Experimental Psychologist

Reputation: 219

Matlab or R: replace elements in matrix by values from another matrix in order

I have a problem to solve in either Matlab or R (preferably in R).

Imagine I have a vector A with 10 elements.

I have also a vector B with 30 elements, of which 10 have value 'x'.

Now, I want to replace all the 'x' in B by the corresponding values taken from A, in the order that is established in A. Once a value in A is taken, the next one is ready to be used when the next 'x' in B is found.

Note that the sizes of A and B are different, it's the number of 'x' cells that coincides with the size of A.

I have tried different ways to do it. Any suggestion on how to program this?

Upvotes: 0

Views: 1780

Answers (2)

Eitan T
Eitan T

Reputation: 32930

MATLAB Solution

In MATLAB it's quite simple, use logical indexing:

B(B == 'x') = A;

Upvotes: 2

Matthew Lundberg
Matthew Lundberg

Reputation: 42689

As long as the number of x entries in B matches the length of A, this will do what you want:

B[B=='x'] <- A

(It should be clear that this is the R solution.)

Upvotes: 2

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