I have two 1x128 matrices. I want to substract them, but only for specific columns (For examples for columns 1 to 50 and 90 to 128.

I have two 1x128 matrices (data1 and data2). I want to subtract data2 from data1, but only for specific columns (For examples columns 1 to 50 and 90 to 128. And then store this as data3 as a new 1x128 matrix. Can anyone help me please?

[Guillaume]

So what goes into column 51 to 89 of the result?

[Stephen Jeffreys]

Sorry I should have mentioned, the values from the data1 matrix

Answer 1

[Guillaume]

data3 = data1;
data3(:, [1:50, 90:128]) = data1(:, [1:50, 90:128]) - data2(:, [1:50, 90:128]);

or the other way round:

data3 = data1 - data2;
data3(:, 51:89) = data1;

[Stephen Jeffreys]

I was missing the comma in the code %([1:50, 90:128])

Thank you so much, I really appreciate this. Best, Stephen

Answer 2

[elham kreem]

let :

a=1:128

b= 2: 129

z= b(1, [1:50,90:128]) - a(1,[1:50,90:128])