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	tutil.c: add residual and random number functions - granular - granular dynamic…
	git clone git://src.adamsgaard.dk/granular
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	---
	commit 0ced4ee84ae554d75646ebbaa76cc31c2397cfb3
	parent b6248f108d84c1068e84381d5a06a34522ebdc82
	Author: Anders Damsgaard <[email protected]>
	Date: Thu, 18 Mar 2021 08:55:40 +0100

	util.c: add residual and random number functions

	Diffstat:
	M util.c \| 26 ++++++++++++++++++++++++++
	M util.h \| 6 ++++++

	2 files changed, 32 insertions(+), 0 deletions(-)
	---
	diff --git a/util.c b/util.c
	t@@ -1,4 +1,5 @@
	#include <stdio.h>
	+#include <stdlib.h>
	#include <math.h>
	#include "granular.h"

	t@@ -78,3 +79,28 @@ check_int_non_negative(const char name[], const int value, …
	*status = 1;
	}
	}
	+
	+double
	+residual(const double new_val, const double old_val)
	+{
	+ return (new_val - old_val) / (old_val + 1e-16);
	+}
	+
	+double
	+random(void)
	+{
	+ return (double)rand() / RAND_MAX;
	+}
	+
	+double
	+random_value_uniform(double min, double max)
	+{
	+ return random() * (max - min) + min;
	+}
	+
	+double
	+random_value_powerlaw(double power, double min, double max)
	+{
	+ return pow((pow(max, power + 1.0) - pow(min, power + 1.0)) * random()
	+ + pow(min, power + 1.0), 1.0 / (power + 1.0));
	+}
	diff --git a/util.h b/util.h
	t@@ -7,4 +7,10 @@ void check_float_non_negative(const char name[], const double…
	void check_float_positive(const char name[], const double value, int *status);
	void check_bool(const char name[], const double value, int *status);
	void check_int_non_negative(const char name[], const int value, int *status);
	+
	+double residual(const double new_val, const double old_val);
	+
	+double random_value_uniform(double min, double max);
	+double random_value_powerlaw(double power, double min, double max);
	+
	#endif