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How can I create a structure?

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Amit Bhasin
Amit Bhasin 2019-1-24
关闭： MATLAB Answer Bot 2021-8-20
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'
  1 个评论
Stephen23
Stephen23 2019-1-24
编辑：Stephen23 2019-1-24
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

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回答（2 个）

Kevin Phung
Kevin Phung 2019-1-24
编辑：Kevin Phung 2019-1-24
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
Amit Bhasin
Amit Bhasin 2019-1-24
Thanks it worked! However, I am little confused about the indexing! Can you please explain it?

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