how to make a variable name from a string
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2013a version
>> test='eye'
>> value = [5,5,3]
value =
5 5 3
>> eval([sprintf(test) '= data+1']);
Index exceeds matrix dimensions.
How to fix this error? Thank you for helping!
采纳的回答
The error should not appear, your code looks to work exept for the part of 'data' , should this instead be value?
test='eye';
value=[1,2,3];
eval([sprintf(test) '=value+1'])
eye =
2 3 4
The index exceeds matrix dimension could be related to that you have at some point declared a variable in your workspace ( or funciton or whatever ) with the name of eval.
try typing
which eval
it should return that eval is a built-in function, if it returns eval is a variable there is the reason for your error. If so just use
clear eval
更多回答（3 个）
xianghong
2013-8-16
0 个投票
1 个评论
Walter Roberson
2013-8-16
No, it is not just for creating field names within a variable. It shows a number of different alternatives to creating a variable from a string, recommending strongly that you use one of the alternatives instead of creating a variable dynamically. At the end of the FAQ it shows how to create a variable dynamically, for the rare case when you really need to do that. If you are not engaged in creating extensions to MATLAB itself, chances are that there is a better route than creating a variable dynamically.
xianghong
2013-8-16
0 个投票
2 个评论
Walter Roberson
2013-8-16
Please use the command
clear eval
and then try again
xianghong
2013-8-19
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