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

Question

Harvey Rael 2018-8-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/413464-changing-elements-of-an-array-by-row-and-column-using-for-loop

评论： Harvey Rael 2018-8-3

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)
end
end
end

Any thoughts why I continually get this error? Best, Harvey

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

James Tursa 2018-8-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/413464-changing-elements-of-an-array-by-row-and-column-using-for-loop#answer_331518

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 个评论
显示 -1更早的评论隐藏 -1更早的评论

Harvey Rael 2018-8-3

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.

请先登录，再进行评论。