Create n symbolic variables
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Hi, I would like to know if there's a way to create n differente symbolic variables (n is an input). Thank's in advanced
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madhan ravi
2018-10-25
编辑：madhan ravi
2018-10-25
EDITED
n=input('value of n?')
syms(sym('a',[1 n]))
a=(sym('a',[1 n])) %storing symbolic variables in a vector for convenience and also to use indexing
command window displays:
value of n?10
n =
10
a =
[ a1, a2, a3, a4, a5, a6, a7, a8, a9, a10]
>> a(1:6)
ans =
[ a1, a2, a3, a4, a5, a6]
>>
The above is strictly not recommended though please see http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval
9 个评论
madhan ravi
2018-10-25
The above shows an example of creating n symbolic variables
madhan ravi
2018-10-25
编辑：madhan ravi
2018-10-25
If it’s what you want accept the answer so other people know the question is solved else let know
Walter Roberson
2018-10-25
Note that this creates a single variable, A, that contains a vector of symbolic expressions that refer to symbolic variables that live in the symbolic engine, same as if you had done
A = [sym('A1'), sym('A2'), sym('A3'), ... sym('A20')];
The code does not create variables A1, A2, A3, ... A20 at the MATLAB level. You will not see them in the workspace; you will only see A in the workspace.
If you need to create them at the MATLAB level, then chances are that you should be coding differently.
madhan ravi
2018-10-25
Yes sir I thought the OP asked to simply create variable to be used further in mathematical equations
madhan ravi
2018-10-25
Edited the answer sir Walter, thank you for pointing it out
Walter Roberson
2018-10-25
syms(sym('a',[1 n]))
That does work to create the variables in the MATLAB workspace, but any time you are creating a variable number of variables in the MATLAB workspace you should stop yourself and ask if it is strictly necessary to do so, as there is almost always a better way.
madhan ravi
2018-10-25
Oh yes sir Walter didn’t think of it actually thank you once again
one plus one is two
2018-11-20
madhan ravi
2018-11-20
Anytime :)
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