Add C version (20x faster)

.gitignore

@@ -0,0 +1,3 @@
+/tags
+/a.out
+

random_boolean_network.c

@@ -0,0 +1,106 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+
+#define NUM_NODES 80
+#define NUM_CONNECTIONS 4
+#define NUM_GENERATIONS 250
+#define TRUTH_TABLE_SIZE (1 << NUM_CONNECTIONS)
+
+const unsigned char CHAR_ZERO = '0';
+const unsigned char CHAR_ONE = ' ';
+
+unsigned int nodes[NUM_NODES];
+unsigned int buffer[NUM_NODES];
+unsigned int connections[NUM_NODES][NUM_CONNECTIONS];
+unsigned int truth_table[TRUTH_TABLE_SIZE];
+
+void randomize_boolean_array(unsigned int *arr, unsigned int length);
+void randomize_connections();
+void propagate();
+void print_truth_table();
+void print_connections();
+void print_generation(unsigned int g);
+
+int main(void)
+{
+    srand(time(NULL));
+
+    randomize_boolean_array(nodes, NUM_NODES);
+    randomize_boolean_array(truth_table, TRUTH_TABLE_SIZE);
+    randomize_connections();
+    print_truth_table();
+    print_connections();
+    print_generation(0);
+
+    for (unsigned int i = 1; i < NUM_GENERATIONS; i++) {
+        propagate();
+        print_generation(i);
+    }
+    
+    return 0;
+}
+
+void propagate()
+{
+    unsigned int i, j, tt_index;
+    memcpy(buffer, nodes, NUM_NODES * sizeof(unsigned int));
+    for (i = 0; i < NUM_NODES; i++) {
+        tt_index = 0;
+        for (j = 0; j < NUM_CONNECTIONS; j++) {
+            tt_index += buffer[connections[i][j]] << (NUM_CONNECTIONS - 1 - j);
+        }
+        nodes[i] = truth_table[tt_index];
+    }
+}
+
+void randomize_boolean_array(unsigned int *arr, unsigned int length)
+{
+    for (unsigned int i = 0; i < length; i++) {
+        arr[i] = rand() % 2;
+    }
+}
+
+void randomize_connections()
+{
+    unsigned int i, j;
+    for (i = 0; i < NUM_NODES; i++) {
+        for (j = 0; j < NUM_CONNECTIONS; j++) {
+            connections[i][j] = rand() % 20;
+        }
+    }
+}
+
+void print_truth_table() 
+{
+    unsigned int i;
+    printf("Truth table:\n");
+    for (i = 0; i < TRUTH_TABLE_SIZE; i++) {
+        printf("[%3d] => [%d]\n", i, truth_table[i]);
+    }
+}
+
+void print_connections() 
+{
+    unsigned int i, j;
+    printf("Connections:\n");
+    for (i = 0; i < NUM_NODES; i++) {
+        printf("[%3d] => [", i);
+        for (j = 0; j < NUM_CONNECTIONS; j++) {
+            printf("%d, ", connections[i][j]);
+        }
+        printf("]\n");
+    }
+    
+}
+
+void print_generation(unsigned int g)
+{
+    unsigned int i;
+    printf("G%5d  ", g);
+    for (i = 0; i < NUM_NODES; i++) {
+        printf("%c ", nodes[i] == 0 ? CHAR_ZERO : CHAR_ONE);
+    }
+    printf("\n");
+}

random_boolean_network.php

@@ -8,9 +8,9 @@
     Fri 13 Nov
 */
 
-const NUM_NODES = 20;
+const NUM_NODES = 80;
-const NUM_CONNECTIONS = 3;
+const NUM_CONNECTIONS = 4;
-const NUM_GENERATIONS = 20;
+const NUM_GENERATIONS = 250;
 
 const CHAR_ON_ZERO = '0';
 const CHAR_ON_ONE = ' ';