Graphics Programs Reference
In-Depth Information
Built-in Functions
x
.
|
|
abs
acos
arccos
x
.
asin
arcsin
x
.
atan
arctan
x
. Use
atan2
instead if you want the angular coordinate
of the point
θ
(
x
y
).
,
bessel
Bessel functions;
besselj(n, x)
and
bessely(n, x)
are linearly inde-
pendent solutions of Bessel's equation of order
n
.
conj
Gives the complex conjugate of a complex number.
conj(1 - 5*i)
cos
cos
x
.
cosh
cosh
x
.
cot
cot
x
.
erf
The error function erf(
x
)
)
x
/
√
π
0
e
−
t
2
dt
.
(2
=
exp
e
x
.
expm
Matrix exponential.
gamma
The gamma function
=
0
e
−
t
t
x
−
1
dt
(when Re
x
(
x
)
0). The property
>
(
k
1)
k
!, for nonnegative integers
k
, is sometimes useful.
+
=
imag
imag(
z
), the imaginary part of a complex number.
log
The natural logarithm ln
x
log
e
x
.
real
real(
z
), the real part of a complex number.
sec
sec
x
.
sech
sech
x
.
sign
Returns
=
1, 0, or 1, depending on whether the argument is negative, zero, or
−
positive.
sin
sin
x
.
sinh
sinh
x
.
sqrt
√
x
.
tan
tan
x
.
tanh
tanh
x
.
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