math

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Computation of median for discrete data: non-standard computation

1

Using (require math), we can compute (median < data), where data is a list of numbers. When data length is even, then normally the median is computed by averaging the...

encomer

Shallow / Optional types

10

Now that Typed Racket has Shallow & Optional modes, we might be able to make the math library work for untyped code without crazy slowdowns. But it's not as simple...

bennn

Github Actions

3

We ought to use Github Actions to validate PRs.

soegaard

Complex special functions

13

Algorithms for calculating gamma, log-gamma and digamma in the complex field

bdeket

PR #71 introduced a regression in the accuracy of some double-flonum functions: `fl2sqrt`, `fl2sqr`, `fl2/`, `flsqrt/error`. This was to avoid using the translated code from crlibm for licensing reasons. As...

samth

factorize should be more limited

3

It would be ideal if `factorize` is injective. It is not right now due to how `(factorize 0)` = `(factorize 1)` = `'()`. Changing the type of the domain to...

sorawee

Some math/flonum functions have much larger error than expected

2

Random testing (see #35) discovered a number of cases where functions such as `fl2+` and `fl2-` have substantial error (32 ulps) and functions such as `fl2exp`, `flexp/error`, and `fl2expm1` have...

samth

If by accident bfsqrt is given a non-bigfloat the error message doesn't come from the Racket layer. ``` Welcome to Racket v7.6. > (require math/bigfloat) > (bfsqrt 2) ; mpfr->C:...

soegaard

It'd be nice to have matrices and arrays be serializable/faslable.

tonyg

I wish math/flonum (or racket/flonum) had an `flzero?` function. There are flonum-specific functions for most other arithmetic functions, but not `zero?`. Interestingly, math/flonum has `fl2zero?` for double-doubles, but nothing for...

kengruven