Index in position 1 is invalid. Array indices must be positive integers or logical values.

Hey all,

Long story short, I need to flip my data/reassign the w data to new indices on the y axis and got the indices 394,530. However I am trying to extract the data from ReSHEARLAYERandWAKE2(1).uxux.w (a structured data set containing some w values - say reynolds stresses for each x and y position)

from specific x and y ranges, and yet everytime i am shown an error "Index in position 1 is invalid. Array indices must be positive integers or logical values."

ww = ReSHEARLAYERandWAKE2(1).uxux.w;
wwmirror = ww;

for i = 0:366
    for j = 394:530
        wwmirror(i,1080 - (j - 394)) = ww(i,j) 
    end
end

Answer 1

[Bhaskar R]

Index of the array start from 1 and it must be positive integer in MATLAB.

In your code for loop i = 0:366 starting from 0 that means ww(i,j) iterates as w(0, 394) so on.. It is invalid in MATLAB indexing

so change the logic so that in satisfies "Index of the array start from 1 and it must be positive integer in MATLAB."

For more details

https://in.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html

[yashvini shukla]

Thanks a lot!! That worked. I am triying to use the showf function, and it works

>> showf(ReSHEARLAYERandWAKE2(1).mean(223:400,100:500))

Index in position 1 exceeds array bounds (must not exceed 1).

not sure how to show only specific parts in the data.

thankss