`sympref`

Gets or sets preferences of the Symbolic Math Toolbox.

Category: Symbolic Computations in MATLAB > Symbolic Variables, Expressions, Functions, and Preferences

Syntax

sympref(name, value)

Sets the preference name to value.

old = sympref(name, value)

Sets the preference and returns its previous value.

sympref('default')

Restores every preference to its default.

prefs = sympref

Returns a structure with the current preferences.

Description

Preferences affect how results are displayed and how a few special values are defined. 'HeavisideAtOrigin' sets the value of heaviside(0), 'FourierParameters' sets the convention of fourier, and 'FloatingPointOutput' shows results as floating-point numbers instead of exact values.

Preferences last for the session. Call sympref('default') to reset them, which is good practice at the start and end of a script that changes them.

Input arguments

name: Preference name: 'FloatingPointOutput', 'PolynomialDisplayStyle', 'HeavisideAtOrigin', 'AbbreviateOutput', 'MatrixWithSquareBrackets', 'FourierParameters', 'TypesetOutput'.
value: New value for the preference.

Output arguments

old: Previous value of the preference, or a struct of all preferences.

Example

Changing and restoring a preference

sympref('HeavisideAtOrigin', 1);
heaviside(sym(0))
sympref('default');
heaviside(sym(0))

Output

ans = 1
ans = 1/2

Notes

MatLivre stores every preference, but of them only 'HeavisideAtOrigin', 'FourierParameters' and 'FloatingPointOutput' change results. The display preferences 'PolynomialDisplayStyle' and 'MatrixWithSquareBrackets' are accepted and have no effect on the output.

sympref