evaluate using floating-point arithmetic - Maple Help

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evalf - evaluate using floating-point arithmetic

Calling Sequence

evalf(expression)

Parameters

expression

-

expression to be evaluated

Basic Information

Description

• 

The evalf command numerically evaluates expressions (or subexpressions) involving constants (for example, π, ⅇ, and γ ) and mathematical functions (for example, exp, ln, sin, arctan, cosh, GAMMA, and erf).

  

For a complete list of constants, see Initially Known Names. For a complete list of mathematical functions, see Initially Known Mathematical Functions.

Output

• 

The evalf command returns a floating-point or complex floating-point number or expression.

Examples

π

π

(1)

evalfπ

3.141592654

(2)

evalfcos1+sin1I

0.5403023059+0.8414709848I

(3)

evalf3x24+1x32

0.7500000000x2+0.3333333333x1.414213562

(4)

The evalf command can be used to evaluate more complex mathematical functions.

f:=∫01ⅇx3ⅆx

f:=∫01ⅇx3ⅆx

(5)

evalff

1.341904418

(6)

g:=x=110001x

g:=x=110001x

(7)

evalfg

61.80100877

(8)

The number of significant digits can be restricted with the evalf command.

evalf3π

3.14

(9)

evalf15π

3.14159265358979

(10)

Details

  

For detailed information including:

• 

Complete description of all parameters

• 

Controlling numeric precision of computations

• 

Special evaluation for user-defined constants and functions

  

see the evalf/details help page.

See Also

Digits, float, fsolve, Initially Known Mathematical Functions, Initially Known Names, Numeric Computation in Maple, Rounding


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