MATLAB: Can i undo command in command window

undo command

Hi there. I'm new to Matlab and i'm learning it's usage with a book that contains exercises. Sometimes it happens that i create a matrix and make several changes to it through different exercises.

If i do something wrong at some point and change the matrix in a way that i shouldn't have. Is there a way of undo only the last command? Or do i have to change the matrix step by step all over again?

Best Answer

If you’re doing everything in the Command Window, there is no going back.

I would open and save a script file for your exercises and run the script file instead. You can Comment (use % in the first column) the lines you want to save but do not want to run for later reference as you go through your textbook. (I have a script file like that to test and save code I post here on Answers.) You can also use comments to refer to specific exercises on specific pages with respect to your code, so you can refer to it later.

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MATLAB: How to save the command that I wrote it in command window

Save saves the values of variables, not the commands by which you created them.

Easiest way to save a sequence of your work if you were working at the command line is probably--

commandhistory % open the command history window

Then highlight the section you wish that you've done and right click...that'll open a menu one item of which is "Create Script". Select that and the highlighted section will be pasted into a new editor script window which you can then rename and modify at will..

Alternatively, simply highlight the area in the command window, and copy it to clipboard via ^C and type

edit aScriptName.m

and then ^V to paste into the window...same end result. aScriptName.m is, of course, a placeholder for whatever filename you wish to give your script, not to be taken as literal.

MATLAB: I have Matlab2017 and I keep on loosing the scripts im creating.

The images you have posted do not show any scripts. We really need to see how lalala.m was generated.

Your screenshot of the Editor window with lalala.m indicates that the contents of lalala.m is really that of a .mat file. Also, your "Current Folder" window shows no file called lula.mat, even though the Command Window shows that you have used the save() command to create such a file.

I have the vague impression that you are using the save() command to save what you have done at the command line and then you are changing the .mat extension of the resulting file to .m. Then you are somehow re-opening the .m file with the editor. That is wrong, of course.

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MATLAB: How to save the command that I wrote it in command window

MATLAB: I have Matlab2017 and I keep on loosing the scripts im creating.

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