"Bytes" is 0 in Variable Editor

a.data=rand(100,1);
b=dlnode(rand(100,1));

Then you'll find in Variable Editor the "Bytes" of a.data or b.data is 0!

Why?

Verified on 2008a and 2010b.

While it's correct in Workspace Window.

Thanks a lot.

Answer 1

[Fangjun Jiang]

If you do a=struct() or b=[], you will see that the variable a and b have been declared but not assigned value. Thus, a and b have not taken any memory bytes to store the value. Once you assign a value, the number of bytes will change depending on the size of the data stored.

[Shunchao Wu]

Thanks, Jiang.

I've modified my question, 呵呵。

[Fangjun Jiang]

What do you mean "Variable Editor"?

[Shunchao Wu]

For 2011b:

http://www.mathworks.cn/help/techdoc/matlab_env/f10-42271.html

[Fangjun Jiang]

Thank you! I've verified in R2010b that it is showing 0 bytes.

I think this might be a bug. Please report to TMW. Good finding!

[Shunchao Wu]

OK, I'll report this bug.

Answer 2

[Walter Roberson]

In R2008b, I did

a.data=rand(100,1);
openvar a

but I could not see any "Bytes" field in the Variable Editor.

Same when I used the Workspace Browser to examine a.

[Shunchao Wu]

On Microsoft Windows systems, you can right-click any column header to show the "Bytes" column.