how to run the matlab code step-by-step?

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bsd
bsd 2011-7-26
Dear sir/madam,
I need to run the matlab code step-by-step, and also see what is happening in the code or the variables. How can I do this? Looking forward to hearing from you soon.
Thanking you, BSD

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回答（3 个）

Arnaud Miege
Arnaud Miege 2011-7-26
Use the debugger. See Editing and Debugging MATLAB Code in the documentation for more details.
HTH,
Arnaud
  1 个评论
Jan
Jan 2011-7-26
@Arnaud: Thanks for this important answer. Although it might seem so obvious, there are a lot of questions in this forum, which could be avoided, if the user knows how to apply the debugger. +1

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Andreas Goser
Andreas Goser 2011-7-26
Many users also prefer not line by line, but a bit larger chunks. Look for "Cell Mode".
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Jessica
Jessica 2011-7-26
@bsd, If you put %% on a line, you'll notice that it separates the code into pieces. You can separate chunks of your code by putting %% in various places. Then, if you want to just run one cell, you can simply hit ctrl+enter (or right click and then click "Evaluate Current Cell").
Ex:
%% First cell
x = 1:2:10 ;
y = 5:-1:1 ;
z = x + y ;
%% Second cell
figure(1)
plot3(x,y,z)
When you ctrl+enter while your cursor is in the first cell, it only defines the variables. Then, when you ctrl+enter while in the second cell, it only plots the figure. I hope that helps clarify @Andreas Goser's answer.
Arnaud Miege
Arnaud Miege 2011-7-27
If you read the section of the documentation I mentioned in my answer, you'll see there is a part entitled "Evaluating Subsections of Files Using Code Cells".

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Daniel Shub
Daniel Shub 2011-7-27
There is a recent blog post by Loren http://blogs.mathworks.com/loren/2011/04/28/is-there-an-echo-out-there/ about the echo command. Cell mode and the debugger are nice, but I think a lot of us have forgotten (or never knew) the power of echo.

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