Can I use a symbol as a variable?

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Prasenjit Dewanjee
Prasenjit Dewanjee on 19 Feb 2023
Commented: Walter Roberson on 19 Feb 2023
In my code, I have declared:
syms m
I have thes huge expressions that contain m in them as a symbol. Later in the code, I want to use m as a varibale in a loop like this:
m= 1:1:20
Is there any way to do this?
Any help will be appreciated.

Answers (1)

Paul on 19 Feb 2023
Hi Prasenjit,
Yes, you can do that
syms m
f = m^2 % expression that contains m as a symbol
f = 
whos m % m is sym
Name Size Bytes Class Attributes m 1x1 8 sym
for m = 1:1:20; % loop with m
m; % do something with m
whos m % m is now a double
Name Size Bytes Class Attributes m 1x1 8 double
At this point f is still an expression in terms of m
f = 
However, the m that is in f is now not related to the variable m in the Matlab workspace. Are you sure that's what you want?
What is the goal of defining expressions in terms of sym m and then using m as a loop variable? If you show a simple example of what you're trying to do someone might be able to help do it in a different or better way.
  1 Comment
Walter Roberson
Walter Roberson on 19 Feb 2023
if the idea is that you want the loop variable m to become the value of symbolic m, then see subs()

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