MATLAB Answers

Constructing names of array and structure variables

1 ビュー (過去 30 日間)
z8080
z8080 2021 年 8 月 12 日
コメント済み: z8080 2021 年 8 月 13 日
I'm trying to dynamically create variable names, for array and struc variables. However, my usual way (below) does not work, as the brackets and dots used in the names of struc array variables are not accepted:
>> varName = genvarname ( ['a(i,j).sampleNo' num2str(n) ] )
varName =
'a0x28i0x2Cj0x290x2EsampleNo2'
>> varToPlot = eval(varName)
Error using eval
Unrecognized function or variable 'a0x28i0x2Cj0x290x2EsampleNo2'.
Any suggestions? Thanks!

採用された回答

Stephen
Stephen 2021 年 8 月 12 日
編集済み: Stephen 2021 年 8 月 12 日
"I'm trying to dynamically create variable names, for array and struc variables"
But your example shows you changing a structure fieldname, not a variable name. So your description does not match your example. It is not clear what you mean by "structure variables" as all structures are arrays, just like every other fundamental data type in MATLAB:
In any case, your EVAL-approach is slow, very ill-advised, counter-productive, and best avoided: https://en.wikipedia.org/wiki/Anti-pattern
The neat, simple, and very efficient MATLAB approach for the example you show is by using a dynamic fieldname:
For example:
F = sprintf('sampleNo%d',n);
varToPlot = a(i,j).(F)
Numbered fieldnames indicates poor data design which would be more efficiently accessed using indexing.
  1 件のコメント
z8080
z8080 2021 年 8 月 13 日
Thank you very much Stephen, you are right that my approach was quite suboptimal, and my description of it was inaccurate also. I've learnt something valuable from your answer.

サインインしてコメントする。

その他の回答 (0 件)

製品


リリース

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by