Python Standard Library

math

> (lsci-math:pi)
3.141592653589793
> (lsci-math:e)
2.718281828459045
> (lsci-math:phi 6)
0.9999999990134123
> (lsci-math:ceil 5.1)
6
> (lsci-math:floor 5.1)
5
> (lsci-math:round 5.67)
6
> (lsci-math:round 5.6666667 1)
5.7
> (lsci-math:round 5.6666667 3)
5.667

Of couse, this is just as usable from Erlang:

1> 'lsci-math':pi().
3.141592653589793
2> 'lsci-math':e().
2.718281828459045
3> 'lsci-math':phi(6).
0.9999999990134123
4> 'lsci-math':ceil(5.1).
6
5> 'lsci-math':floor(5.1).
5
6> 'lsci-math':round(5.67).
6
7> 'lsci-math':round(5.6666667, 1).
5.7
8> 'lsci-math':round(5.6666667, 3).
5.667

cmath

Complex numbers are suppored; in fact, there's a whole module dedicated to them:

> (set cmplx1 (lsci-cmath:complex -1.0 2.0))
#($erlport.opaque python
  #B(128 2 99 95 95 98 117 105 108 116 105 110 95 95 10 99 111 109 112 108 ...))
> (set cmplx2 (lsci-cmath:complex -1.0 -2.0))
#($erlport.opaque python
  #B(128 2 99 95 95 98 117 105 108 116 105 110 95 95 10 99 111 109 112 108 ...))
> (lsci-cmath:real cmplx1)
-1.0
> (lsci-cmath:imag cmplx1)
2.0
> (lsci-cmath:real cmplx2)
-1.0
> (lsci-cmath:imag cmplx2)
-2.0

> (lsci-cmath:->str cmplx1)
"(-1+2j)"
> (lsci-cmath:->str (lsci-cmath:conj cmplx1))
"(-1-2j)"
> (lsci-cmath:->str cmplx2)
"(-1-2j)"
> (lsci-cmath:->str (lsci-cmath:conj cmplx2))
"(-1+2j)"

> (lsci-cmath:phase (lsci-cmath:complex -1.0 0.0))
3.141592653589793
> (lsci-cmath:phase (lsci-cmath:complex -1.0 -0.0))
-3.141592653589793

The second function below isn't working correctly in Erlang, 'cause I'm not sure how to make a negative zero float in Erlang (LFE just does the right thing).

For instance, -0.0. returns 0.0 instead of -0.0. I'll need the input from an Erlang master to show the working example of that:

9> 'lsci-cmath':phase('lsci-cmath':complex(-1.0, 0.0)).
3.141592653589793
10> 'lsci-cmath':phase('lsci-cmath':complex(-1.0, -0.0)).
3.141592653589793