Correlation using for loop
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Elizabeth Yeap
il 11 Gen 2021
Commentato: Elizabeth Yeap
il 12 Gen 2021
Dear all,
I have 2 matrices, M_ET [3700 12] and M_Compiled [7400 12]. Using a for loop, I want to do the following:
- Correlate [100 12] of M_ET with [100 12] M_Compiled to get [1 12] of values stored in C_ET.
- Repeat 1. for the remaining rows of M_ET and M_Compiled, where rows increase by 100.
C_ET(1,:) = diag(corr(M_ET(1:100,:), M_Compiled(1:100,:)));
C_ET(2,:) = diag(corr(M_ET(101:200,:), M_Compiled(101:200,:)));
C_ET(3,:) = diag(corr(M_ET(201:300,:), M_Compiled(201:300,:)));
My C_ET should therefore be [74 12]. However, my C_ET is instead giving me [1 12]. Any help is greatly appreciated. Thank you.
% M_ET = [3700 12]
% M_Compiled = [7400 12]
% C_ET = [37 12]
for row = 1:100:7400
for r = 1:100:3700
row1 = row;
row2 = row + 99;
r1 = r;
r2 = r1 + 99;
C_ET(:,:) = diag(corr(M_ET(r1:r2,:), M_Compiled(row1:row2,:)));
end
end
4 Commenti
KALYAN ACHARJYA
il 11 Gen 2021
If you describe the question with a sample example, it will be easier to answer.
- What do you have?
- What are you trying to do?
Risposta accettata
KALYAN ACHARJYA
il 11 Gen 2021
Problem, you are trying to access the rows to 7400, but the rows in M _ET [3700 12] have a maximum of 3700, as
M_ET [3700 12]
M_Compiled [7400 12]
If you manage to provide enough rows to the M _ET data matrix, there will be no problem
C_ET=cell(1,74);
l=1;
for i=1:100:7400-99
C_ET{l}=diag(corr(M_ET(i:i+99,:), M_Compiled(i:i+99,:)));
l=l+1;
end
C_ET=cell2mat(C_ET);
Verify
>> whos C_ET
Name Size Bytes Class Attributes
C_ET 12x74 7104 double
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