i have a function that should work but doesn't

i'm comparing two arrays and choosing the repeated numbers

and then rearranging the new output in descending order

Y1 = [0.0581    0.0424    0.0315    0.0239    0.0184    0.0143    0.0113    0.0090    0.0073    0.0059]
Z1 = [0.0090    0.0073    0.0059]
X = intersect(Z1, Y1)
Ratio = reshape(sort(X(:), 'descend'), [columns, rows])';

this is the result i get, i don't understand why

Undefined function or variable 'columns'.

Ratio = reshape(sort(X(:), 'descend'), [columns, rows])';

Answer 1

[Adam Danz]

Matlab doesn't know what "columns" means (nor "rows"). My guess is that 'columns' and 'rows' are the number of columns and rows of your reshaped data. Do you know what those values are supposed to be?

In your example data, X is a [1x3] vector. One example would be the following

Ratio = reshape(sort(X(:), 'descend'), [3, 1])';

which is the same as

Ratio = fliplr(sort(X)); 

[Omar Almahallawy]

thnak you it works

[Adam Danz]

Yes, my example using your inputs does not produce an error but make sure this is what your code is supposed to be doing. Just because there isn't an error doesn't mean the code is correct. Many people have learned that the hard way.