符号与数值之间的转换

将符号数据转换为数值、将数值转换为符号对象

您可以使用 Symbolic Math Toolbox™ 在符号数据类型与 MATLAB^® 数值数据类型之间转换数据。您还可以使用可变精度算术执行高精度的数值计算。

函数

`sym`	创建符号变量、表达式、函数、矩阵
`vpa`	Variable-precision arithmetic (arbitrary-precision arithmetic)
`symfun`	创建符号函数
`subs`	Symbolic substitution
`str2sym`	Evaluate string representing symbolic expression
`cell2sym`	Convert cell array to symbolic array
`sym2cell`	Convert symbolic array to cell array
`poly2sym`	从系数向量创建符号多项式

`double`	Convert symbolic values to MATLAB double precision
`matlabFunction`	Convert symbolic expression to function handle or file
`sym2poly`	从符号多项式中提取所有数值系数（包括零）的向量

Numeric to Symbolic Conversion
Convert floating-point numbers to exact symbolic numbers.
Choose Numeric or Symbolic Arithmetic
Compare and contrast double-precision, variable-precision, and symbolic arithmetic.
Increase Precision of Numeric Calculations
Increase precision arbitrarily with variable-precision arithmetic.
Compute Binomial Coefficients Exactly
This example shows how to get precise values for binomial coefficients and find probabilities in coin-tossing experiments using the Symbolic Math Toolbox™.
Find Almost Integers with High-Precision Arithmetic
Find almost integers, or numbers that are very close to integers, using variable-precision arithmetic in Symbolic Math Toolbox.
Decimal Digits of PI
This example shows how to use variable-precision arithmetic to investigate the decimal digits of pi using Symbolic Math Toolbox™.
Generate MATLAB Functions from Symbolic Expressions
Convert symbolic expressions to MATLAB functions that accepts numeric values.
Change Output Format of Symbolic and Variable-Precision Arithmetic
Change output format of symbolic and variable-precision arithmetic.