Picomath: self-contained math functions in 11 languages

http://picomath.org/

by johndcook • 15 years ago

33 17 15 years ago

picomath.org

Deutscher• 15 years ago

I didn't check them all, but I got 403 and blank pages when trying to access the python and C++ files respectively.

zwieback• 15 years ago

me too, IE and Chrome

p4bl02• 15 years ago

Also 403 for Python. The other page are blank because they use <script ... /> which is not correct and should be <script ...></script> but the code is here if you look at the source.

ghewgill2• 15 years ago

Thanks for noticing that! I've fixed the code and it should work now. (It was probably only a problem for IE, please let me know if it's still not fixed.)

wccrawford• 15 years ago

Even odder, the text is actually there, if you view the source. I think maybe his pretty print javascript is going haywire.

pygy_• 15 years ago

You can find the code on the GitHub page: https://github.com/ghewgill/picomath

GrangalanJr• 15 years ago

I noticed that the Ruby pages link to files that end in ".rb.html", but if you remove the ".html" from the end, it leads you right to the Ruby files.

SlyShy• 15 years ago

Pretty cool. The Ruby port is of questionable use, considering erf, gamma, etc. are already implemented in the Math module.

ghewgill2• 15 years ago

Newer versions of Python also contain implementations for gamma and erf. I implemented all functions in each language mostly for completeness, but I will add a note in the code snippet where the function is already provided by the language standard library.

Tanner• 15 years ago

Great! I had been passively looking for a lua gamma function to replace one I had been using since lmathx can't be compiled on Windows. Passively found!

johndcook• 15 years ago

The site has been updated to fix the problem with the source being invisible.

kungfu71186• 15 years ago

I was just wondering, what would you use the gamma function for? I'm not that far enough in the mathematical field to know, so that's why i ask. Maybe a real world example? Thanks.

ggchappell• 15 years ago

The gamma function shows up in a number of common probability distributions. For example, there is the gamma distribution, which is useful for modeling how long it will be until some random-ish thing happens: how long until some machine fails, how long until some extreme weather event happens. (Or something like that; I'm at the far borders of my field of expertise here.)

andrewcooke• 15 years ago

thanks for this. but why not make the c++ examples c? then both c and c++ users can use them (and other languages wrap them more easily). looking at a few examples, it shouldn't be too much work.

brianobush• 15 years ago

No C? Seems like one would have done these in C instead of C++. Not that there is much to change, but it would suite a wider audience.

tzs• 15 years ago

Cool. It could be useful to add the incomplete gamma functions. They are used in calculating the chi squared distribution, and so come up in analyzing A/B testing.

Picomath: self-contained math functions in 11 languages

Related Stories