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Clear function works in command window but not in script file

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Matt
Matt 2015-8-31
评论： Titus Edelhofer 2015-9-1
Hello everyone,
I am facing a weird problem here with the CLEAR function. I am generating a string using the following function:
varname=strcat('time',num2str(get(popupmenu1, 'Value')))
I am then using the following function:
clear (varname)
However, I do not get any error, but the variable is not deleted. On the other hand, when I just type the above command directly in the command window, the variable is deleted!
How comes?

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回答（2 个）

Walter Roberson
Walter Roberson 2015-8-31
Leave out the (), just
clear varname
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Matt
Matt 2015-9-1
Thank you for your answer guys. I am still struggling on this simple task however. I've tried several combination and eventho I understand the principle of evalin and assignin, I cannot get my head around this.
varname=strcat('time',num2str(get(popupmenu1, 'Value')))
evalin('base', varname)
clear varname
The first line should give me something like time1, time2, or time3. I am then getting the value out of the workspace with evalin, and then clearing it, but it doesn't work.
Titus Edelhofer
Titus Edelhofer 2015-9-1
As I wrote below, this should work
varname=strcat('time',num2str(get(popupmenu1, 'Value')))
% get the data from base workspace
data =evalin('base', varname);
% clear the variable
evalin('base', ['clear ' varname]);

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Titus Edelhofer
Titus Edelhofer 2015-9-1
You can either use clear as function as you did, or use string concatenation. Since you need to use evalin anyway, string concatenation is not as bad as usual:
Summarizing, adding the following line after
varname=strcat(...)
should do:
evalin('base', ['clear ' varname]);
Titus

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