Using Variable Contents to Create Variable names

Question

Brian 2012-2-27

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/30450-using-variable-contents-to-create-variable-names

评论： Stephen23 2017-7-7

I have two variables (RtnType and MyPG) each with their values down the rows. I would like to write the results of my code loop as I iterate through these variables to the proper variable derived by combining the values of these two variables.

    RtnType = {'Daily' 'RollWeek' 'RollMonth' 'RollQtr' 'YTD' 'RollYear' 'SinceIncept'};
      MyPG = {'MTAC' 'MTAM' 'MTAG' 'MLCE'};
for i = 1:4
   for x = 1 to 7
       MyMedian = [1.5];
      %Desired Concatenation look
      %MyPG{i,1} & '_' & RtnType{x,1} = [MyPG{i,1} & '_' & RtnType{x,1},[DailyMedian]
      %Actual statement result for i=1 and x=1
      MTAC_Daily = [MTAC_Daily; MyMedian]
   end
end

Can someone show me how to write the results of each loop to different vectors that have been pre-created?

Thanks a lot, Brian

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Stephen23 2017-7-7

Do NOT waste your time writing bad code that creates separate variables with numbered variable names: "A frequent use of the eval function is to create sets of variables such as A1, A2, ..., An, but this approach does not use the array processing power of MATLAB and is not recommended."

source: http://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

Just use indexing: simple, fast, efficient, neat, simple, easy to understand, much less buggy, easier to debug, etc, etc, etc.

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

https://www.mathworks.com/matlabcentral/answers/143-how-do-i-make-a-series-of-variables-a1-a2-a3-a10

https://www.mathworks.com/matlabcentral/answers/57445-faq-how-can-i-create-variables-a1-a2-a10-in-a-loop

etc, etc, etc.

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Answer 1

Jonathan Sullivan 2012-2-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/30450-using-variable-contents-to-create-variable-names#answer_38916

在 MATLAB Online 中打开

eval([MyPG{i} '_' RtnType{x} '= [' MyPG{i} '_' RtnType{x} ',' num2str(MyMedian) '];'])

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Brian 2012-2-27

Thanks this answer works perfectly. The only thing I added was decimal precision on the num2str command to prevent it from rounding me to 4 decimal places.

Thanks a lot!

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