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sym and syms

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Dwyane Wade
Dwyane Wade 2011-8-14
回答： Dean WANG 2018-9-29
what is the use of sym and syms and what are their differences?

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Paulo Silva
Paulo Silva 2011-8-14
syms is a shortcut to the function sym, it makes it easier for the user to create symbolic variables.
Example:
x=sym('x');
y=sym('y');
Using the shortcut syms you do the same thing just with the code:
syms x y
  2 个评论
Dwyane Wade
Dwyane Wade 2011-8-14
what's the purpose of using them?
Paulo Silva
Paulo Silva 2011-8-14
Symbolic variables aren't constants like regular variables, you don't assign any value to them, you can use them to solve expressions using functions from Symbolic Math Toolbox™, for example:
syms a b c x
solve(a*x^2+b*x+c) %finds the roots of the quadratic expression
%Notice the results, it's the quadratic formula/equation

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更多回答（1 个）

Dean WANG
Dean WANG 2018-9-29
sym only define one variable,but syms can define more

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