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Convert numeric values to symbolic numbers or expressions. Use sym on subexpressions instead of the entire expression for better accuracy. Using sym on entire expressions is inaccurate because MATLAB® first converts the expression to a floating-point number, which loses accuracy. sym cannot always recover this lost accuracy.
- Str2sym
Because the MATLAB ® parser automatically converts all...
- Symfun
Return the body of a symbolic function by using formula.You...
- Create Symbolic Matrices
The sym function also lets you define a symbolic matrix or...
- Syms
syms is a shortcut for sym, symfun, symmatrix, and...
- Choose Syms Or SYM Function
To declare a symbolic variable within a function, use sym....
- Str2sym
syms is a shortcut for sym, symfun, symmatrix, and symfunmatrix. This shortcut lets you create several symbolic objects with one function call. For example, you can use sym and create each symbolic scalar variable separately.
sym – Create numbered symbolic variables, symbolic variables in MATLAB functions, or symbolic numbers whose values differ from their names in the MATLAB workspace. syms – Create fresh symbolic variables for interactive symbolic workflows, that is, for symbolic variable creation at the MATLAB command line or in MATLAB live scripts.
The sym function also lets you define a symbolic matrix or vector without having to define its elements in advance. In this case, the sym function generates the elements of a symbolic matrix at the same time that it creates a matrix.
To declare a symbolic variable within a function, use sym. For example, you can explicitly define a MATLAB variable x in the parent function workspace and refer x to a symbolic variable with the same name.
Symbolic Math Toolbox provides a set of simplification functions allowing you to manipulate the output of a symbolic expression. For example, the following polynomial of the golden ratio phi. phi = (1 + sqrt (sym (5)))/2; f = phi^2 - phi - 1. returns. f = (5^ (1/2)/2 + 1/2)^2 - 5^ (1/2)/2 - 3/2.
The Symbolic Math Toolbox allows to define symbolic expressions in terms of symbolic variables such as t,x,y. All results are exact symbolic results. If you type. format long g% show 15 digits of numerical results. [ sin (pi), sin (pi/3), sin (pi/7) ] ans = 1×3.
