i need help with an older version of matlab, i don't understand the error message

hello everyone, i'm not really good with matlab software but i can manage to code a little on matlab r2021, but due to somework related problems i have to work on a code writting in matlab r2009, and i have this error that i don't know how to deal with it, so if anyone could guide me i'll appreciate it , thanks in advance

Answer 1

[Image Analyst]

metrique2 is a matrix with rows and columns, let's call them R and C.

metrique2(i, :) or metrique2(j, :) is the i'th or j'th row of that matrix. So it's a row vector with 1 row and C columns.

metrique2(i, :)' or metrique2(j, :)' transposes that row vector into a column vector. So it's a column vector with C rows and 1 column.

Now, when you construct a new matrix using a space or comma between the terms, it stitched them together horizontally. So that means that they must all have the same number of rows. You can't stitch a 10x1 vector onto a 99x1 vector because the bottom would be "ragged" which is not allowed.

Now we know that metrique2(i, :)' and metrique2(j, :)' defintely both have C rows, so the error is saying that I1 does not have C rows. Perhaps it is a row vector instead of a column vector. Perhaps it has as many elements as rows in metrique2 instead of as columns as metrique2. I don't know. How do we find out. Put these lines before the line that throws the error

whos metrique2
whos I1

[Image Analyst]

By the way, I'm pretty sure this error would happen in any release of MATLAB.

[Ammar MRABTI]

@Image_Analyst thank you so much for the clarification , it really helped me . like i said i'm not a good user of matlab so i wouldn't now , thank you

[Image Analyst]

You forgot to tell us the dimensions - the results from the whos commands. Did you try what I suggested?