Alternative way of defining a variable

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Saurabh Madankar
Saurabh Madankar on 19 Oct 2021
Answered: Walter Roberson on 19 Oct 2021
Hello,
Is there any way I can define a variable without assigning it any value and not using syms?
  1 Comment
KSSV
KSSV on 19 Oct 2021
In what contest? What is the requirement?

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Answers (2)

KSSV
KSSV on 19 Oct 2021
a = zeros([],1) ;
b =[] ;
But it depends. What is the requirement?
  3 Comments
Walter Roberson
Walter Roberson on 19 Oct 2021
str2sym('t')
ans = 
t
Does not directly use sym() or syms() . It uses sym() internally though.
Is the point that you need to be able to use piecewise() but for some reason you cannot use symbolic variables? Note that piecewise() is part of the symbolic toolbox, so if you have a restriction against using the symbolic toolbox then you cannot use piecewise()

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Walter Roberson
Walter Roberson on 19 Oct 2021
Problem based optimization permits you to use optimvar() to define variables to be optimized over, without giving the variables specific values.
This probably satisfies your question as originally asked.
Unfortunately, piecewise() cannot be used with problem-based optimization.

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