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Changing elements of an array by row and column using for loop?

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Hi all,
So essentially I am trying to correct some acos mistakes in an 180x40 array. I want to run through each element of the array first by rows then by columns, but I am having trouble with error messages. I keep getting "Index in position 2 exceeds array bounds (must not exceed 1)."
My array of angles look like this.
psi_deg = 180x40;
alpha = diff(psi_deg)
for i = 1:length(alpha)
for j = 1:size(alpha)
if alpha(i,j)<0
transform_angle(i,j) = 360 - psi_deg %If the angle should be greater than 180 but it is displayed as less, display the greater version
else transform_angle(i,j) = psi_deg(i,j)
Any thoughts why I continually get this error? Best, Harvey

Accepted Answer

James Tursa
James Tursa on 3 Aug 2018
You should probably be using size(alpha,1) and size(alpha,2) instead of length(alpha) and size(alpha) in your looping. And you need to index psi_deg. That being said, it is hard to advise if what you are doing makes sense without knowing your goal.
  1 Comment
Harvey Rael
Harvey Rael on 3 Aug 2018
I'll try this.
As to the goal, my goal is to create an array of angle measurements and correct for the issue where acos has returned a value less than 180 where I know it should be more.

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