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 eval(obj[,prec])

:: Evaluate obj numerically.
 return

number or expression
 obj

general expression
 prec

integer

Evaluates the value of the functions contained in obj as far as
possible.

The computation is done by PARI (See section
pari
).

When prec is specified, computation will be performed with a
precision of about precdigits.
If prec is not specified, computation is performed with the
precision set currently. (See section
setprec
)

Currently available numerical functions are listed below.
Note they are only a small part of whole PARI functions.
sin
, cos
, tan
,
asin
, acos
, atan
,
sinh
, cosh
, tanh
,
asinh
, acosh
, atanh
,
exp
, log
, pow(a,b) (a^b)

Symbols for special values are as the followings.
 @i

unit of imaginary number
 @pi

the number pi,
the ratio of circumference to diameter
 @e

Napier's number (exp(1))
[118] eval(exp(@pi*@i));
1.0000000000000000000000000000
[119] eval(2^(1/2));
1.414213562373095048763788073031
[120] eval(sin(@pi/3));
0.86602540378443864674620506632
[121] eval(sin(@pi/3)3^(1/2)/2,50);
2.78791084448179148471 E58
 References

section
ctrl
, section setprec
, section pari
.
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