From 0f1a31648c5292fa49b35eac90a2ee676d6c13e6 Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Sat, 31 Jan 2015 06:05:23 +0000
Subject: [PATCH] idk, probably something changed
---
src/utils.c | 187 ++++++++++++++++++++++++++++++++++------------
1 files changed, 138 insertions(+), 49 deletions(-)
diff --git a/src/utils.c b/src/utils.c
index 1afe048..2635494 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -1,17 +1,66 @@
-#include "utils.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
+#include <float.h>
+#include <limits.h>
+
+#include "utils.h"
+
+void pm(int M, int N, float *A)
+{
+ int i,j;
+ for(i =0 ; i < M; ++i){
+ printf("%d ", i+1);
+ for(j = 0; j < N; ++j){
+ printf("%10.6f, ", A[i*N+j]);
+ }
+ printf("\n");
+ }
+ printf("\n");
+}
+
+
+char *find_replace(char *str, char *orig, char *rep)
+{
+ static char buffer[4096];
+ char *p;
+
+ if(!(p = strstr(str, orig))) // Is 'orig' even in 'str'?
+ return str;
+
+ strncpy(buffer, str, p-str); // Copy characters from 'str' start to 'orig' st$
+ buffer[p-str] = '\0';
+
+ sprintf(buffer+(p-str), "%s%s", rep, p+strlen(orig));
+
+ return buffer;
+}
float sec(clock_t clocks)
{
return (float)clocks/CLOCKS_PER_SEC;
}
-void error(char *s)
+void top_k(float *a, int n, int k, int *index)
{
- fprintf(stderr, "Error: %s\n", s);
+ int i,j;
+ for(j = 0; j < k; ++j) index[j] = 0;
+ for(i = 0; i < n; ++i){
+ int curr = i;
+ for(j = 0; j < k; ++j){
+ if(a[curr] > a[index[j]]){
+ int swap = curr;
+ curr = index[j];
+ index[j] = swap;
+ }
+ }
+ }
+}
+
+void error(const char *s)
+{
+ perror(s);
exit(0);
}
@@ -29,8 +78,8 @@
list *split_str(char *s, char delim)
{
- int i;
- int len = strlen(s);
+ size_t i;
+ size_t len = strlen(s);
list *l = make_list();
list_insert(l, s);
for(i = 0; i < len; ++i){
@@ -44,9 +93,9 @@
void strip(char *s)
{
- int i;
- int len = strlen(s);
- int offset = 0;
+ size_t i;
+ size_t len = strlen(s);
+ size_t offset = 0;
for(i = 0; i < len; ++i){
char c = s[i];
if(c==' '||c=='\t'||c=='\n') ++offset;
@@ -57,9 +106,9 @@
void strip_char(char *s, char bad)
{
- int i;
- int len = strlen(s);
- int offset = 0;
+ size_t i;
+ size_t len = strlen(s);
+ size_t offset = 0;
for(i = 0; i < len; ++i){
char c = s[i];
if(c==bad) ++offset;
@@ -71,26 +120,30 @@
char *fgetl(FILE *fp)
{
if(feof(fp)) return 0;
- unsigned long size = 512;
+ size_t size = 512;
char *line = malloc(size*sizeof(char));
if(!fgets(line, size, fp)){
free(line);
return 0;
}
- int curr = strlen(line);
-
- while(line[curr-1]!='\n'){
- size *= 2;
- line = realloc(line, size*sizeof(char));
- if(!line) {
- printf("%ld\n", size);
- malloc_error();
+ size_t curr = strlen(line);
+
+ while((line[curr-1] != '\n') && !feof(fp)){
+ if(curr == size-1){
+ size *= 2;
+ line = realloc(line, size*sizeof(char));
+ if(!line) {
+ printf("%ld\n", size);
+ malloc_error();
+ }
}
- fgets(&line[curr], size-curr, fp);
+ size_t readsize = size-curr;
+ if(readsize > INT_MAX) readsize = INT_MAX-1;
+ fgets(&line[curr], readsize, fp);
curr = strlen(line);
}
- line[curr-1] = '\0';
+ if(line[curr-1] == '\n') line[curr-1] = '\0';
return line;
}
@@ -121,34 +174,34 @@
int count_fields(char *line)
{
- int count = 0;
- int done = 0;
+ int count = 0;
+ int done = 0;
char *c;
- for(c = line; !done; ++c){
- done = (*c == '\0');
- if(*c == ',' || done) ++count;
- }
- return count;
+ for(c = line; !done; ++c){
+ done = (*c == '\0');
+ if(*c == ',' || done) ++count;
+ }
+ return count;
}
float *parse_fields(char *line, int n)
{
- float *field = calloc(n, sizeof(float));
- char *c, *p, *end;
- int count = 0;
- int done = 0;
- for(c = line, p = line; !done; ++c){
- done = (*c == '\0');
- if(*c == ',' || done){
- *c = '\0';
- field[count] = strtod(p, &end);
- if(p == c) field[count] = nan("");
- if(end != c && (end != c-1 || *end != '\r')) field[count] = nan(""); //DOS file formats!
- p = c+1;
- ++count;
- }
- }
- return field;
+ float *field = calloc(n, sizeof(float));
+ char *c, *p, *end;
+ int count = 0;
+ int done = 0;
+ for(c = line, p = line; !done; ++c){
+ done = (*c == '\0');
+ if(*c == ',' || done){
+ *c = '\0';
+ field[count] = strtod(p, &end);
+ if(p == c) field[count] = nan("");
+ if(end != c && (end != c-1 || *end != '\r')) field[count] = nan(""); //DOS file formats!
+ p = c+1;
+ ++count;
+ }
+ }
+ return field;
}
float sum_array(float *a, int n)
@@ -181,6 +234,14 @@
return a;
}
+float mse_array(float *a, int n)
+{
+ int i;
+ float sum = 0;
+ for(i = 0; i < n; ++i) sum += a[i]*a[i];
+ return sqrt(sum/n);
+}
+
void normalize_array(float *a, int n)
{
int i;
@@ -208,6 +269,7 @@
a[i] *= s;
}
}
+
int max_index(float *a, int n)
{
if(n <= 0) return -1;
@@ -222,13 +284,40 @@
return max_i;
}
+// From http://en.wikipedia.org/wiki/Box%E2%80%93Muller_transform
+#define TWO_PI 6.2831853071795864769252866
float rand_normal()
{
- int i;
- float sum= 0;
- for(i = 0; i < 12; ++i) sum += (float)rand()/RAND_MAX;
- return sum-6.;
+ static int haveSpare = 0;
+ static double rand1, rand2;
+
+ if(haveSpare)
+ {
+ haveSpare = 0;
+ return sqrt(rand1) * sin(rand2);
+ }
+
+ haveSpare = 1;
+
+ rand1 = rand() / ((double) RAND_MAX);
+ if(rand1 < 1e-100) rand1 = 1e-100;
+ rand1 = -2 * log(rand1);
+ rand2 = (rand() / ((double) RAND_MAX)) * TWO_PI;
+
+ return sqrt(rand1) * cos(rand2);
}
+
+/*
+ float rand_normal()
+ {
+ int n = 12;
+ int i;
+ float sum= 0;
+ for(i = 0; i < n; ++i) sum += (float)rand()/RAND_MAX;
+ return sum-n/2.;
+ }
+ */
+
float rand_uniform()
{
return (float)rand()/RAND_MAX;
--
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