MATLAB: How to make new variables and values in for loop

for loopnaming

I want to make and define variables with for loop like:

for i=1:3

something

Ai = …

something

end

so that after running this, I have defined variables of Ai, or A1, A2, A3 in this case

I tried to search and found out there is something such as A{i} or saving values to arrays, but in the end I need to transform them again as the above and get separate defined variables…

Thank you.

Best Answer

Please do not create numbered variables!

If you want varying values for different iterations, subscript ‘A’ instead:

A(i) = ...

or:

A{i} = ...

depending upon what you want to do, and the size of ‘A’.

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We recommend against this. Dynamically assigning to full variables is trouble prone, and would tend to contribute to the confusion between variables at the MATLAB level and variables with the same name that exist in the symbolic engine.

You would be better off using subs(). One way would be to keep a cell array of symbolic variables (not a normal vector, a cell), and a another cell of corresponding values and then subs() in appropriate fragments using the subs(expression, cell, cell) calling syntax.

Another approach is to keep a scalar struct with one field per variable name with corresponding value set, and then use the subs(expression, struct) calling syntax. (Note: I recently found problems in the case where a struct member was empty even if that variable was not being substituted.)

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a1+a2+a3 = norminv(0.9,mu,sigma)

https://de.mathworks.com/help/stats/norminv.html

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