How to change a variable name without changing the value itself?

Question

Antonio Victoria 2023-6-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1981124-how-to-change-a-variable-name-without-changing-the-value-itself

回答： Antonio Victoria 2023-6-13

I've got some variables like these: OutArray, OutArray2 and so on...

I need to refresh the base name OutArray adding the "1", "2", "3"... taking advantage of the loop iterator, how may I do it?

I have MATLAB R2023A

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Stephen23 2023-6-10

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

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2023-6-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1981124-how-to-change-a-variable-name-without-changing-the-value-itself#answer_1253524

编辑：Image Analyst 2023-6-10

在 MATLAB Online 中打开

Just do them one at a time, reassiging existing variables to variables with your new, preferred names. Then you can clear the old-named variables from memory with clear if you want.

newname1 = OutArray;
newName2 = OutArray2;
newName3 = OutArray3;
newName4 = OutArray4;
clear('OutArray', 'OutArray2', 'OutArray3', 'OutArray4');

Surely you don't have more than a handful of those variables. If you do (big mistake), then see this

TUTORIAL: Why Variables Should Not Be Named Dynamically (eval) -

for reasons why not to do that.

FAQ: https://matlab.fandom.com/wiki/FAQ#How_can_I_create_variables_A1,_A2,...,_A10_in_a_loop?

If you have tons of variable names because they are columns of a big table you read in from a file, then consider converting them all to a 2-D array with the table2array function.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Star Strider 2023-6-10

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1981124-how-to-change-a-variable-name-without-changing-the-value-itself#answer_1253519

Save them as elements of a cell array instead, when you first create them.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 3

chicken vector 2023-6-10

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1981124-how-to-change-a-variable-name-without-changing-the-value-itself#answer_1253514

This is in general not recommend because is prone tu bugs and affects code readibility.

If you really want to do this anyway, have a look at genvarname and eval.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 4

claudio 2023-6-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1981124-how-to-change-a-variable-name-without-changing-the-value-itself#answer_1253534

编辑：claudio 2023-6-10

在 MATLAB Online 中打开

The easy way

variables = ["OutArray" "OutArray2" "OutArray3"];
for kk = 1:numel(variables)
    eval(variables(kk) + string(kk) + " = eval(variables(kk))");
    clear(variables(kk))
end

A more refined way

variables = string(who);    % retrieve the name of the variables from workspace 
                            % without having to write them by hand
for kk = 1:numel(variables)
    eval(variables(kk) + string(kk) + " = eval(variables(kk))");
    clear(variables(kk))
end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

John D'Errico 2023-6-10

编辑：John D'Errico 2023-6-10

Neither of those ways is at all refined. And neither of them are a remotely good idea. They will lead to crappy, buggy, and SLOW code, when a simple array was all that was ever needed. Is there even a remotely good reason to recommend this? NO.

请先登录，再进行评论。