Ondřej Čertík certik

The original author of the @sympy and @symengine libraries and the @lfortran and LPython (@lcompilers) compilers. Co-founder of the @fortran-lang organization

certik / gist:996213

Created May 27, 2011 21:26

sqrt(a**2+b**2) using Newton method and integers

certik / gist:1001505

Created May 31, 2011 23:45

U N study rmax=50, rmin=1e-7, a=2.7e6

certik / fparser

Created June 8, 2011 00:58

Generate .pxd from Fortran sources

	#! /usr/bin/env python

	import os
	import sys
	from optparse import OptionParser
	import re

	def main():
	parser = OptionParser(usage="[options] filename")
	# parser.add_option("-n", "--no-upload",

certik / gist:1028715

Created June 16, 2011 05:23

certik / gist:1028717

Created June 16, 2011 05:26

	$ bin/test sympy/physics/quantum/tests/test_spin.py
	============================= test process starts ==============================
	executable: /usr/bin/python (2.7.1-final-0)
	ground types: python

	sympy/physics/quantum/tests/test_spin.py[7] .EE..f. [FAIL]

	________________________________________________________________________________
	____________ sympy/physics/quantum/tests/test_spin.py:test_rewrite _____________
	File "/home/ondrej/repos/sympy/sympy/physics/quantum/tests/test_spin.py", line 25, in test_rewrite

certik / README.md

Created July 20, 2011 22:12

C vs Fortran benchmark

On my machine, the timings are:

Fortran:

$ time ./a.out 
   249999999500000000

real	0m0.510s
user	0m0.510s
sys	0m0.000s

certik / b.c

Created July 20, 2011 22:33

	// Compile with:
	// gcc -O3 -march=native -ffast-math -funroll-loops b.c
	#include "stdio.h"

	long sumit(long n)
	{
	long i = 0, s = 0;
	while (i < n) {
	s += i;
	i++;

certik / b.c

Created July 20, 2011 23:22

	// Compile with:
	// gcc -O3 -march=native -ffast-math -funroll-loops b.c
	#include "stdio.h"

	long sumit(long n)
	{
	long i = 0, s = 0;
	while (i < n) {
	s += i;
	i++;

certik / gist:1133548

Created August 9, 2011 07:20

certik / gist:1205621

Created September 9, 2011 06:32