dynamic structure reference gives error

2016 10 5
2 个回答
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更新时间：2016 10 7
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0 个投票

I have s structure field named d.NL330260 and a temporary variable grade_n which is a 1x1 cell array containing 'NL330260'. I tried implementing the following:
grade_n = 'NL330260';
d.(grade_n)
but , I get this error message.
Argument to dynamic structure reference must evaluate to a valid field name.
What could be the problem??

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Steven Lord
Steven Lord 2016-10-5

1 个投票

This is not the exact code you were using:
grade_n = 'NL330260';
d.(grade_n)
It was more like:
grade_n = {'NL330260'};
d.(grade_n)
When using dynamic field names, the dynamic field name must be a char row vector. You were passing in a scalar cell array with a char row vector inside the cell, but that's different. Using char as you did is one way to resolve the problem; another is to extract the char row vector from the cell.
grade_n = {'NL330260'};
d.(grade_n{1})

更多回答（1 个）

na ja
na ja 2016-10-5

0 个投票

OK, solved it. I put it in this way:
grade_n = 'NL330260';
d.((char(grade_n) ))

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Jan
Jan 2016-10-5
Use Steven's suggestion of indexing with {1} instead of the slower converions by CHAR().

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