knowuh/Flake-Saver

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 // Copyright (c) 2010 Noah Paessel // //Permission is hereby granted, free of charge, to any person obtaining a copy //of this software and associated documentation files (the "Software"), to deal //in the Software without restriction, including without limitation the rights //to use, copy, modify, merge, publish, distribute, sublicense, and/or sell //copies of the Software, and to permit persons to whom the Software is //furnished to do so, subject to the following conditions: // //The above copyright notice and this permission notice shall be included in //all copies or substantial portions of the Software. // //THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR //IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, //FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE //AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER //LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, //OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN //THE SOFTWARE. // #include "nrand.h" #include #include #include void seed() { srandomdev(); } float rand_float () { double rdouble = 0; /* DESCRIPTION The random() function uses a non-linear, additive feedback, random number generator, employing a default table of size 31 long integers. It returns successive pseudo-random numbers in the range from 0 to (2**31)-1. The period of this random number generator is very large, approximately 16*((2**31)-1). */ long r = random(); long max = powl(2,31) -1; double r2 = (double) r; rdouble = r2/max; return rdouble; } int rand_int (int range) { float rnd_f = rand_float(); return (rnd_f * range) + 1; } float gauss () { double x; double pi,r1,r2; pi = 4*atan(1); r1 = -log(1-float_between(0.0f,1.0f)); r2 = 2 * pi * float_between(0.0f,1.0f); r1 = sqrt(2*r1); x = r1 * cos(r2); // y = r1 * sin(r2); return (x - 0.5f) * 2; } float float_between(float min, float max) { float rnd_f = rand_float(); float scalar = max - min; rnd_f = rnd_f * scalar; rnd_f = rnd_f + min; return rnd_f; }