Python counterparts for C math functions

Python has direct counterparts to most of the functions in C’s standard math library.The Python functions have the same name as their C counterparts with three exceptions:

• `fabs` in C corresponds to `abs` in Python
• `tgamma` in C corresponds to `gamma` in Python
• `lgamma` in C corresponds to `gammaln` in Python

The function `abs` is at the top level of Python. Aside from this exception, all mathematical functions are found in `math`, `scipy`, or `scipy.special`.

All functions in `math` have counterparts in `scipy` with the same name. However, the `scipy` version may behave differently. For example, `math.sqrt(-1)` returns a domain error but `scipy.sqrt(-1)` returns `1j`.

Python (specifically SciPy) has far more functions than C. The following chart lists Python counterparts for C functions in `math.h`.

Function Python counterpart
acos math.acos
acosh math.acosh
asin math.asin
asinh math.asinh
atan math.atan
atan2 math.atan2
atanh math.atanh
ceil math.ceil
copysign math.copysign
cos math.cos
cosh math.cosh
erf scipy.special.erf
erfc scipy.special.erfc
exp math.exp
exp2 scipy.exp2
expm1 scipy.special.expm1
fabs abs
fmax scipy.fmax
fmin scipy.fmin
fmod scipy.fmod
hypot scipy.hypot
isfinite ! scipy.lisinf
isinf scipy.isinf
isnan scipy.isnan
j0 scipy.special.j0
j1 scipy.special.j1
jn scipy.special.jn
ldexp math.ldexp
lgamma scipy.special.gammaln
log math.log
log10 math.log10
log1p math.log1p
log2 scipy.log2
nan scipy.nan
pow math.pow
remainder scipy.remainder
sin math.sin
sinh math.sinh
sqrt math.sqrt
tan math.tan
tanh math.tanh
tgamma scipy.special.gamma
y0 scipy.special.y0
y1 scipy.special.y1
yn scipy.special.yn