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Units[Simple]

  

eval

  

evaluate at a point

 

Calling Sequence

Parameters

Description

Examples

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 Simple Units environment, any verifications of valid dimensions ignore so-called Unit annotations.

• 

In the Simple Units environment, the eval function is overloaded to evaluate an expression, taking units into account.

• 

Every command in the Simple Units environment that needs to determine whether an expression is valid or not, does so using the Units[TestDimensions] command.

• 

For other properties, see the global function eval.

Examples

withUnitsSimple:

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.

– 

When you edit a unit, double brackets appear around it.

velocitysqrt2Unitgnheight

velocity2heightgn

(1)

evalvelocity,height=3Unitft

11431250196133125000ms

(2)

evalf

4.234902776ms

(3)

evalvelocity,height=0.03Unitkm

0.05477225576196133ms

(4)

evalf

24.25693715ms

(5)

See Also

eval

evalf

Units

Units of Acceleration

Units/Simple