How do I compute the correlation between corresponding rows of two matrices?
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Michael Wolf
am 11 Mai 2018
Kommentiert: Michael Wolf
am 11 Mai 2018
I have two matrices, X and Y, which each have 60 columns and 10,000 rows.
I would like to create a vector R, such that the nth value of vector R represents the correlation between row n of matrix X and row n of matrix Y.
I have tried:
[R,pval] = corr(X',Y');
but this gives me R as a 10,000-by-10,000 matrix.
What am I doing wrong?
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possibility
am 11 Mai 2018
X is 10,000-by-60 Y is 10,000-by-60
X' is 60-by-10,000 Y' is 60-by-10,000
By correlating these two matrices, i.e. R=corr(X', Y'), you get the 10,000-by-10,000 R matrix whose elements are the pairwise correlation of each column of X' and Y', that is each row of X and Y.
So, you are doing the right thing! Just check the diagonals of that matrix:
>> Rvec= diag (R)
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Shounak Shastri
am 11 Mai 2018
From what I know, Correlation Matrices are usually square. As in you have 10000 rows with 60 elements in each row. So if you take 1 row of dimension 1 x 60, the dimension of your corr matrix would be 60 x 60.
But in your example, you took a transpose. So, now the size of each row is 1 x 10000. And thus when you perform correlation on the rows, you would get a 10000 x 10000 matrix.
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