# How to create a for loop for this?

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Michaela Byrne on 5 Apr 2022
Commented: Voss on 5 Apr 2022
I haven't worked with for loops in a while and can't remember how to set up the for loop for what I'm trying to do. I have an vector, "w", of values and I want to find the difference between values. How would I set up a for loop to do what I did in the last section in my code where I find dw1 through dw3?

Voss on 5 Apr 2022
Edited: Voss on 5 Apr 2022
No loop is necessary; you can use diff (see below).
n = 4;
startFrequency = 0.25;
endFrequency = 1;
frequencies = linspace(startFrequency,endFrequency,n);
w = 2*pi*frequencies;
% no loop necessary:
dw = diff(w)
dw = 1×3
1.5708 1.5708 1.5708
% if you want to use a loop anyway, here's one:
for ii = 1:n-1
dw(ii) = w(ii+1)-w(ii);
end
dw
dw = 1×3
1.5708 1.5708 1.5708
##### 2 CommentsShowHide 1 older comment
Voss on 5 Apr 2022
You're welcome!

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