how to check whether the variable is present or not ?

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Manoj Kumar
Manoj Kumar 2014-12-9
回答： Mohammad Abouali 2014-12-9
hi, I have tried if condition with the help of "exist" as:
checkVariable1= exist('lbl_edge','var');
if checkVariable1==1
edge= newedge1;
else
edge = newedge2;
end
I have also tried
if any(strcmp(who,'lbl_edge'))==1
....
else
...
end
But none of them are working. Can you please help me...
Thanks

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采纳的回答

Mohammad Abouali
Mohammad Abouali 2014-12-9
Works on mine. Try this code.
clear;clc;close all
checkVariable1= exist('lbl_edge','var');
if checkVariable1==1
disp('Exist')
else
disp('didn''t exist')
end
disp('now creating the variable.')
lbl_edge='something';
checkVariable1= exist('lbl_edge','var');
if checkVariable1==1
disp('Exist')
else
disp('didn''t exist')
end
Gives this output
didn't exist
now creating the variable.
Exist

更多回答（1 个）

Image Analyst
Image Analyst 2014-12-9
checkVariable1= exist('lbl_edge','var');
will work. Perhaps you have the Image Processing Toolbox and have conflict between your variable name of edge and the IPT function called edge(). Pick a different name.

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