evaluate at a point - Maple Help

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Units[Standard][eval] - evaluate at a point

Calling Sequence

eval(expr, x = a)

exprx=a|exprx=a

eval(expr, eqns)

 

Parameters

expr

-

algebraic expression

x

-

usually name, but may be general expression

a

-

algebraic expression

eqns

-

set or list of equations

Description

• 

In the Standard Units environment, the eval function is overloaded to evaluate an expression after removing the units, and then combine the result with the units.

• 

For other properties, see the global function eval.

Examples

withUnits[Standard]:

The following defines velocity in terms of the acceleration_of_free_fall unit (gn) and the variable height.

Notes: 

– 

To enter a unit in 2-D Math input, select the unit from the appropriate Units palette. If the unit you want is not there, select unit and then enter the unit.

– 

In Maple 2015 and later versions, the double brackets around a unit are not displayed unless you are editing the unit.

velocity:=2'gn'height

velocity:=2heightgn

(1)

velocityheight=3'ft'|velocityheight=3'ft'

1500023381196133ms

(2)

evalf

4.234902778ms

(3)

velocityheight=0.03'km'|velocityheight=0.03'km'

0.0173205080825196133ms

(4)

evalf

24.25693715ms

(5)

See Also

eval, evalf, Units, Units of Acceleration, Units/Standard


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