findUnits

Find units in input

Syntax

U = findUnits(expr)

Description

U = findUnits(expr) returns a row vector of units in the symbolic expression expr.

Examples

Find Units in Expression

Find the units in an expression by using findUnits.

u = symunit;
syms x
units = findUnits(x*u.m + 2*u.N)

units = $$\left(\begin{array}{cc}\mathrm{N}\mathrm{"newton\; -\; a\; physical\; unit\; of\; force."}& \mathrm{m}\mathrm{"meter\; -\; a\; physical\; unit\; of\; length."}\end{array}\right)$$

Find Units in Array of Equations or Expressions

Find the units in an array of equations or expressions by using findUnits. The findUnits function concatenates all units found in the input to return a row vector of units. findUnits returns only base units.

u = symunit;
array = [2*u.m + 3*u.K, 1*u.N == 1*u.kg/(u.m*u.s^2)];
units = findUnits(array)

units = $$\left(\begin{array}{ccccc}\mathrm{K}\mathrm{"kelvin\; -\; a\; physical\; unit\; of\; temperature."}& \mathrm{N}\mathrm{"newton\; -\; a\; physical\; unit\; of\; force."}& \mathrm{kg}\mathrm{"kilogram\; -\; a\; physical\; unit\; of\; mass."}& \mathrm{m}\mathrm{"meter\; -\; a\; physical\; unit\; of\; length."}& \mathrm{s}\mathrm{"second\; -\; a\; physical\; unit\; of\; time."}\end{array}\right)$$

Input Arguments

expr — Input

symbolic number | symbolic variable | symbolic vector | symbolic matrix | symbolic multidimensional array | symbolic function | symbolic expression

Input, specified as a symbolic number, variable, vector, matrix, multidimensional array, function, or a symbolic expression.

Version History

Introduced in R2017a