How to define symbolic variables in MATLAB?

2 years ago
Noah Thompson
1 minute

In MATLAB, you can use the syms keyword to define symbolic variables. Here are some examples:

  1. Define a single symbol variable:
syms x
  1. Define multiple symbol variables:
syms x y z
  1. Define a symbol variable and specify its type.
syms x real % 定义实数符号变量x
syms y integer % 定义整数符号变量y
syms z positive % 定义正数符号变量z
  1. Define symbolic variables and specify their range.
syms x real % 定义实数符号变量x
assume(x > 0) % 假设x大于0

Note that before defining symbolic variables, the Symbolic Math Toolbox needs to be loaded. If the toolbox is not loaded, you can load it by entering sympref(‘SymbolicEngine’, ‘maple’) in the MATLAB command window.

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