How to multiply only some column and rows for a given number?!

I want to multiply for 2.5 the all the rows (2 in total) but not the 1 column, how should I do?

Like this I litterally get rid of the column 1 after multiplying for 2.5.

scores = score(1:2,2:21).*(2.5)

Thank you for you help

Best

Answer 1

[Fabio Freschi]

You are close to the answer, but you need to keep the first column

% your matrix with data
A = rand(2,21);

% multiply all but the first column
B = [A(:,1) A(:,2:end)*2.5];

[Myke Ziz]

Thank you a lot Fabio for your great answer it is clear now!!

Best regards

Z.M.

[Fabio Freschi]

My pleasure! Please accept the answer if it solves your original problem

F