grey/BOSL2
1
0
Fork 0
mirror of https://github.com/BelfrySCAD/BOSL2.git synced 2024-12-29 16:29:40 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Added gaussian_rand() and log_rand().

Browse source
This commit is contained in:
Revar Desmera 2019-04-10 15:53:40 -07:00
parent b7e3644df3
commit 54d6ca2bd0
1 changed files with 23 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
math.scad
View file

@ -123,6 +123,29 @@ function modrange(x, y, m, step=1) =
) [for (i=[a:step:c]) (i%m+m)%m]; ) [for (i=[a:step:c]) (i%m+m)%m];
// Function: gaussian_rand()
// Usage:
// gaussian_rand(mean, stddev)
// Description:
// Returns a random number with a gaussian/normal distribution.
// Arguments:
// mean = The average random number returned.
// stddev = The standard deviation of the numbers to be returned.
function gaussian_rand(mean, stddev) = let(s=rands(0,1,2)) mean + stddev*sqrt(-2*ln(s.x))*cos(360*s.y);
// Function: log_rand()
// Usage:
// log_rand(minval, maxval, factor);
// Description:
// Returns a single random number, with a logarithmic distribution.
// Arguments:
// minval = Minimum value to return.
// maxval = Maximum value to return. `minval` <= X < `maxval`.
// factor = Log factor to use. Values of X are returned `factor` times more often than X+1.
function log_rand(minval, maxval, factor) = -ln(1-rands(1-1/pow(factor,minval), 1-1/pow(factor,maxval), 1)[0])/ln(factor);
// Function: segs() // Function: segs()
// Description: // Description:
// Calculate the standard number of sides OpenSCAD would give a circle based on `$fn`, `$fa`, and `$fs`. // Calculate the standard number of sides OpenSCAD would give a circle based on `$fn`, `$fa`, and `$fs`.