# Creating a new matrix by interpolating two other matrices

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Summer am 9 Mai 2015
Kommentiert: Summer am 10 Mai 2015
Hello,
I need to write a code that creates a new matrix C based on the values of matrix A and B, where A and B are 61x10 matrices. Each column of the matrices represents a variable that is common for both A and B and needs to be computed for the new matrix C by interpolating between the columns of these two matrices.
I need to formulate this as a matlab code, but not sure how to start. Do I need to use any built-in function to do the interpolation, or would it be fine to write the interpolation function by myself? Also, I have a total of 10 columns (corresponding to 10 different variables), how do I write the for loop such that the calculations are done for each of the variables (columns) over their 61 values (rows)?
I hope my question makes sense. Thanks in advance.
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### Akzeptierte Antwort

dpb am 9 Mai 2015
The beauty of Matlab is that it is vectorized to operate over arrays so you really don't have to do anything special. BUT, you do have to define the problem well enough to have a solution (the Mind Reading Toolbox is yet to be delivered :) ).
What is the interpolating variable between the two arrays? If a simple average is sufficient then
C=(A+B)/2;
works; otherwise add an appropriate weighting to A and B--
C=w*A+(1-w)*B;
for
0<w<1
(The average is just w=0.5, of course)
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dpb am 9 Mai 2015
And, BTW, if w is dependent upon the position rather than a fixed value overall as the average or above, then use the "dot" operators..
C=w.*A+(1-w).*B;
where w has the same dimensions as A and B.
Summer am 10 Mai 2015
Noted. Thank you.

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### Weitere Antworten (1)

Image Analyst am 9 Mai 2015
What's wrong with the obvious averaging????
C = (A+B)/2;
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Image Analyst am 9 Mai 2015
Ah - a key bit of information you didn't explicitly state (though I wondered about before posting). What is w?
Summer am 9 Mai 2015
Sorry for that. My w in this case is: w= (Q-Q1)/(Q2-Q1), where Q1 is used to generate the first matrix A, and Q2 is used to generate the second matrix B. Q is the new rate for which I need to interpolate the values of the two matrices A and B to generate a new one. All of the Q's are scalar values.

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