clean up compilation of C example

C/samples/build-and-run.sh

@@ -1,15 +0,0 @@
-#!/bin/bash
-root="$1"
-gcc -std=c99 -Wall -lm "$root".c -o "$root" -I/usr/local/include -L/usr/local/lib -lgsl -lgslcblas -lm -g
-
-# Link libraries, for good measure
-LD_LIBRARY_PATH=/usr/local/lib
-export LD_LIBRARY_PATH
-
-# Increase stack size limit
-ulimit -Ss 256000
-# -Ss: the soft limit. If you set the hard limit, you then can't raise it
-# 256000: around 250Mbs, if I'm reading it correctly.
-
-# run
-./samples

C/samples/build-gsl.sh

@@ -1,13 +0,0 @@
-#!/bin/bash
-root="$1"
-gcc -std=c99 -Wall -lm "$root".c -o "$root" -I/usr/local/include -L/usr/local/lib -lgsl -lgslcblas -lm -g
-
-# Link libraries, for good measure
-LD_LIBRARY_PATH=/usr/local/lib
-export LD_LIBRARY_PATH
-
-# Increase stack size limit
-ulimit -Ss 256000
-# -Ss: the soft limit. If you set the hard limit, you then can't raise it
-# 256000: around 250Mbs, if I'm reading it correctly.
-

C/samples/makefile

@@ -0,0 +1,50 @@
+# Interface: 
+#   make
+#   make build
+#   make format
+#   make run
+
+# Compiler
+CC=gcc
+# CC=tcc # <= faster compilation
+
+# Main file
+SRC=samples.c
+OUTPUT=samples
+
+## Dependencies
+DEPS='gsl'
+
+## Flags
+INCS=`pkg-config --cflags ${DEPS}`
+LIBS=`pkg-config --libs ${DEPS}`
+DEBUG= #'-g'
+STANDARD=-std=c99
+WARNINGS=-Wall
+
+## Formatter
+STYLE_BLUEPRINT=webkit
+FORMATTER=clang-format -i -style=$(STYLE_BLUEPRINT)
+
+## make build
+build: $(SRC)
+	$(CC) $(DEBUG) $(INCS) $(PLUGS) $(SRC) -o samples $(LIBS)
+
+format: $(SRC)
+	$(FORMATTER) $(SRC)
+
+run: $(SRC) $(OUTPUT)
+	echo "Increasing stack size limit, because we are dealing with 1M samples"
+	ulimit -Ss 256000
+	# ^ Increase stack size limit
+	# -Ss: the soft limit. If you set the hard limit, you then can't raise it
+	# 256000: around 250Mbs, if I'm reading it correctly.
+	./$(OUTPUT)
+
+
+
+# Old:
+# Link libraries, for good measure
+# LD_LIBRARY_PATH=/usr/local/lib
+# export LD_LIBRARY_PATH
+

C/samples/samples.c

@@ -1,8 +1,8 @@
-#include <stdlib.h>
-#include <stdio.h>
-#include <math.h>
-#include <gsl/gsl_rng.h>
 #include <gsl/gsl_randist.h>
+#include <gsl/gsl_rng.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
 
 #define N 1000000
 /* 
@@ -12,129 +12,138 @@
 */
 
 /* Helpers */
-void print(double *ys){
-  for(int i=0; i<N; i++){
-    printf("%f\n", ys[i]);
-  }
-  printf("\n");
+void print(double* ys)
+{
+    for (int i = 0; i < N; i++) {
+        printf("%f\n", ys[i]);
+    }
+    printf("\n");
 }
 
-void fill(double *ys, float f){
-  for(int i=0; i<N; i++){
-    ys[i] = f;
-  }
+void fill(double* ys, float f)
+{
+    for (int i = 0; i < N; i++) {
+        ys[i] = f;
+    }
 }
 
-double sum(double *ps, int n){
-  double result = 0;
-  for(int i=0; i<n; i++){
-    result += ps[i];
-  }
-  return(result);
+double sum(double* ps, int n)
+{
+    double result = 0;
+    for (int i = 0; i < n; i++) {
+        result += ps[i];
+    }
+    return (result);
 }
 
-void cumsum(double *ps, double *rs, int n){
-  double counter = 0;
-  for(int i=0; i<n; i++){
-    counter += ps[i];
-    rs[i] = counter;
-  }
+void cumsum(double* ps, double* rs, int n)
+{
+    double counter = 0;
+    for (int i = 0; i < n; i++) {
+        counter += ps[i];
+        rs[i] = counter;
+    }
 }
 
 /* Distributions*/
-void normal(gsl_rng * r, double *ys, double mean, double std){
-  for(int i=0; i<N; i++){
-    ys[i] = mean + gsl_ran_gaussian(r, std);
-  }
+void normal(gsl_rng* r, double* ys, double mean, double std)
+{
+    for (int i = 0; i < N; i++) {
+        ys[i] = mean + gsl_ran_gaussian(r, std);
+    }
 }
 
-void lognormal(gsl_rng * r, double *ys, double zeta, double sigma){
-  for(int i=0; i<N; i++){
-    ys[i] = gsl_ran_lognormal(r, zeta, sigma);
-  }
+void lognormal(gsl_rng* r, double* ys, double zeta, double sigma)
+{
+    for (int i = 0; i < N; i++) {
+        ys[i] = gsl_ran_lognormal(r, zeta, sigma);
+    }
 }
 
-void to(gsl_rng * r, double *ys, double low, double high){
-  double normal95confidencePoint = 1.6448536269514722; 
-  double log_low = log(low);
-  double log_high = log(high);
-  double zeta = (log_low + log_high)/2;
-  double sigma = (log_high - log_low) / (2.0 * normal95confidencePoint);
-  lognormal(r, ys, zeta, sigma);
+void to(gsl_rng* r, double* ys, double low, double high)
+{
+    double normal95confidencePoint = 1.6448536269514722;
+    double log_low = log(low);
+    double log_high = log(high);
+    double zeta = (log_low + log_high) / 2;
+    double sigma = (log_high - log_low) / (2.0 * normal95confidencePoint);
+    lognormal(r, ys, zeta, sigma);
 }
 
 /* Mixture of distributions */
-void mixture(gsl_rng * r, double *dists[], double *weights, int n, double *results){
-  /* Get cummulative, normalized weights */
-  double sum_weights = sum(weights, n);
-  double normalized_weights[n];
-  for(int i=0; i<n; i++){
-    normalized_weights[i] = weights[i]/sum_weights;
-  }
-  double cummulative_weights[n];
-  cumsum(normalized_weights, cummulative_weights, n);
-  
-  /* Get N samples, drawn from the different distributions in proportion to their weights. */
-  for(int i=0; i<N; i++){
-    double p_1 = gsl_rng_uniform(r);
-    double p_2 = gsl_rng_uniform(r);
-    
-    int index_found = 0;
-    int index_counter = 0;
-    while ((index_found == 0) && (index_counter < n) ){
-      if(p_1 < cummulative_weights[index_counter]){
-        index_found = 1;
-      }else{
-        index_counter++;
-      }
+void mixture(gsl_rng* r, double* dists[], double* weights, int n, double* results)
+{
+    /* Get cummulative, normalized weights */
+    double sum_weights = sum(weights, n);
+    double normalized_weights[n];
+    for (int i = 0; i < n; i++) {
+        normalized_weights[i] = weights[i] / sum_weights;
     }
-    if(index_found == 0) {
-      printf("\nThis shouldn't be able to happen");
-      // gsl_rng_free (r);
-      // abort(); // this shouldn't have happened.
-      
-    }else{
-      int sample_index = (int) floor(p_2 * N);
-      results[i] = dists[index_counter][sample_index];
+    double cummulative_weights[n];
+    cumsum(normalized_weights, cummulative_weights, n);
+
+    /* Get N samples, drawn from the different distributions in proportion to their weights. */
+    for (int i = 0; i < N; i++) {
+        double p_1 = gsl_rng_uniform(r);
+        double p_2 = gsl_rng_uniform(r);
+
+        int index_found = 0;
+        int index_counter = 0;
+        while ((index_found == 0) && (index_counter < n)) {
+            if (p_1 < cummulative_weights[index_counter]) {
+                index_found = 1;
+            } else {
+                index_counter++;
+            }
+        }
+        if (index_found == 0) {
+            printf("\nThis shouldn't be able to happen");
+            // gsl_rng_free (r);
+            // abort(); // this shouldn't have happened.
+
+        } else {
+            int sample_index = (int)floor(p_2 * N);
+            results[i] = dists[index_counter][sample_index];
+        }
     }
-  }
 }
 
 /* Main */
-int main(void){
-  /* Initialize GNU Statistical Library (GSL) stuff */
-  const gsl_rng_type * T;
-  gsl_rng * r;
-  // gsl_rng_env_setup();
-  T = gsl_rng_default;
-  r = gsl_rng_alloc (T);
-  
-  /* Toy example */
-  /* Declare variables in play */
-  double p_a, p_b, p_c;
-  double dist_none[N], dist_one[N], dist_few[N], dist_many[N], dist_mixture[N];
-  
-  /* Initialize variables */ 
-  p_a = 0.8;
-  p_b = 0.5;
-  p_c = p_a * p_b;
-  
-  fill(dist_none, 0);
-  fill(dist_one, 1);
-  to(r, dist_few, 1, 3);
-  to(r, dist_many, 2, 10);
+int main(void)
+{
+    /* Initialize GNU Statistical Library (GSL) stuff */
+    const gsl_rng_type* T;
+    gsl_rng* r;
+    // gsl_rng_env_setup();
+    T = gsl_rng_default;
+    r = gsl_rng_alloc(T);
 
-  /* Generate mixture */
-  int n = 4;
-  double weights[] = { 1 - p_c, p_c/2, p_c/4, p_c/4 };
-  double *dists[] = { dist_none, dist_one, dist_few, dist_many };
-  
-  mixture(r, dists, weights, n, dist_mixture);
-  printf("%f\n", sum(dist_mixture, N)/N);
+    /* Toy example */
+    /* Declare variables in play */
+    double p_a, p_b, p_c;
+    double dist_none[N], dist_one[N], dist_few[N], dist_many[N], dist_mixture[N];
 
-  /* Clean up GSL */
-  gsl_rng_free (r);
+    /* Initialize variables */
+    p_a = 0.8;
+    p_b = 0.5;
+    p_c = p_a * p_b;
 
-  /* Return success*/
-  return EXIT_SUCCESS;
+    fill(dist_none, 0);
+    fill(dist_one, 1);
+    to(r, dist_few, 1, 3);
+    to(r, dist_many, 2, 10);
+
+    /* Generate mixture */
+    int n = 4;
+    double weights[] = { 1 - p_c, p_c / 2, p_c / 4, p_c / 4 };
+    double* dists[] = { dist_none, dist_one, dist_few, dist_many };
+
+    mixture(r, dists, weights, n, dist_mixture);
+    printf("%f\n", sum(dist_mixture, N) / N);
+
+    /* Clean up GSL */
+    gsl_rng_free(r);
+
+    /* Return success*/
+    return EXIT_SUCCESS;
 }