Creating a new variable in each iteration...

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Doron 2012-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/29712-creating-a-new-variable-in-each-iteration

编辑： Stephen23 2019-6-19

采纳的回答： James Tursa

I want to create a new variable in each iteration of a for loop... x_1, x_2, x_3, etc... up to x_50

count = 0;

for i = 2:2:100

count = count + 1;

x_(...I want "count" to go in here... what is the code to achieve this?...) = i^2

end

Basically, there should be an x_1 = 4 created in the first iteration, x_2 = 16 in the second iteration, etc... up to x_50 = 10000

Thanks

D Howard

Note: I have seen others ask similar questions, with experienced users saying things like "this is a bad idea because it is hard to reference these later..." and they suggest creating a vector, but my problem is more general and this is not an option.

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Stephen23 2016-1-31

编辑：Stephen23 2019-6-19

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

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

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James Tursa 2012-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/29712-creating-a-new-variable-in-each-iteration#answer_38087

在 MATLAB Online 中打开

E.g., with the usual caveats about this typically being a bad idea:

eval(['x_' num2str(count) ' = i^2']);

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Jiro Doke 2012-2-20

Oh I see. Right, you don't want to do that. If you have P already and want to break it up, you should create a different cell array with a different name. Actually, it probably won't let you create it and give you an error.

You may also want to take a look at the function "mat2cell", that allows you to take a regular matrix P and convert to a cell array.

Doron 2012-2-20

Ok Jiro, I am about to ask post question directly related to this...

...This is going somewhere, believe me.

Doron

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Walter Roberson 2012-2-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/29712-creating-a-new-variable-in-each-iteration#answer_38088

http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

As best I recall at the moment, I have not had a need for dynamic variable names since the days I programmed in REXX ... 25 years ago.

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Doron 2012-2-20

Hello Walter,

Thank you for this link. I saw that you commented on my original posting (my other question) on plotting from a matrix... there was some confusion about what I want to do.

I rewrote the question to a specific example, you assistance would be greatly appreciated.

D Howard

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