Matrix subtraction every two adjacent column

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MUHAMMAD SYAKIR YUSRI
评论： MUHAMMAD SYAKIR YUSRI 2021-2-12
Hello everyone,I have a matrix x with MxN = (3750X666) and I want to subtract every two adjacent column,normalize it and create a new matrix y= [x(:,n)-x(:,1:n-1))] ./ x(;,n), n start with 2nd column and end with N, how can I do it?
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Matt J
Matt J 2021-2-12
Ran in:
Here is the solution you were given. As you can see, it does 664 subtractions, which is exactly the number of pairs available (separated by a stride of 2) along the whole width of your matrix.
x=rand(3750,666);
y=(x(:,3:end)-x(:,1:end-2))./x(:,2:end-1);
whos y
Name Size Bytes Class Attributes y 3750x664 19920000 double
MUHAMMAD SYAKIR YUSRI
MUHAMMAD SYAKIR YUSRI 2021-2-12
Thank Matt, i was confused earlier. Thank you for the explanation.

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回答（2 个）

Stephan
Stephan 2021-2-12
% sample data
A = randi(10,5,3)
% second col minus first and so on
B = A(:,2:end) - A(:,1:end-1)
% first col minus second and so on
C = A(:,1:end-1) - A(:,2:end)
Matt J
Matt J 2021-2-12
y=diff(x,1,2);

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