Loops and subscripts. Is it possible to build a loop on, say "j" and refer to variables as "variable_1", "variable_2", "variable_last value of j"

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Cruz Angel Echevarria 2016-2-2

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编辑： Stephen23 2019-6-19

Suppose that you have a loop on, say "j"c for j = 1:1:J; end; And you would like to have the following set of functions f(j) = c1_j + 2*c2_j

where j = 1, 2, 3,...., J

Is it possible to do this within a loop?

Thanks a lot, Matlab users.

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Answer 1

Star Strider 2016-2-2

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Yes, but it is considered to be very poor programming practice, so I won’t tell you how to do it. The best way is to refer to ‘c1_j’ and others as ‘c(i,j)’ where you iterate ‘i’ as well as ‘j’ as necessary in your code.

So:

f(j) = c1_j + 2*c2_j

becomes:

f(j) = c(1,j) + 2*c(2,j);

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Answer 2

Stephen23 2016-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/266246-loops-and-subscripts-is-it-possible-to-build-a-loop-on-say-j-and-refer-to-variables-as-variable#answer_208222

编辑：Stephen23 2019-6-19

https://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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Cruz Angel Echevarria 2016-2-2

Wow! First of all, thanks a lot for your immediate and thorough answer! Second, I do realize that I am an absolutely inefficient Matlab programmer. I will try lo learn from users with more expertise. Once again, I really appreciate your help. Regards, Cruz

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