How can I create a structure?

Hello all,

I am trying to create a structure in which I want to store some information. For eg, I found number of columns and rows of an RGB image but whenever I am storing it in a structure its just giving me the name of that particular file not the actual value. Below is the code I used:

imRGB=imread('filename.jpeg');

Columns=size(imRGB,1)

P(2).Columns='Columns'

Rows=size(imRGB,2)

P(3).Rows='Rows'

[Stephen23]

Note that this is incorrect:

Columns=size(imRGB,1)

The first dimension of all arrays are the rows.

As well as that, note that you are creating a non-scalar structure. The unallocated fields of all elements of that structure will simply contain empty arrays, i.e.:

P(1).Columns
P(1).Rows
P(2).Rows
P(3).Columns

https://www.mathworks.com/help/matlab/matlab_prog/access-multiple-elements-of-a-nonscalar-struct-array.html

Answer 1

[Kevin Phung]

Remove the quotation marks. You're storing the string 'Columns' and 'Rows' isntead of the actual numeric variable.

You also dont need the indexing for your structure P.

P.Columns = Columns;
P.Rows = Rows;

should suffice

Answer 2

[Amit Bhasin]

Thanks it worked! However, I am little confused about the indexing! Can you please explain it?