dynamic structure reference gives error

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??

Answer 1

[Steven Lord]

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})

Answer 2

[na ja]

OK, solved it. I put it in this way:

grade_n = 'NL330260';
d.((char(grade_n) ))

[Jan]

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

[na ja]

thanks Jan