add convert.c for libsvm

SVM/libsvm liblinear-usage/README.md

@@ -17,10 +17,11 @@ unix系统下的安装方法：到[官网](http://www.csie.ntu.edu.tw/~cjlin/lib
 
 	>注：gen_datafile.py是我自己写的一个python脚本，放在我的[github](https://github.com/wepe/MachineLearning/tree/master/SVM/libsvm%20liblinear-usage)
 
-2. 生成可执行文件 a.out，在终端下键入：
+2. 编译convert.c生成可执行文件 a.out，在终端下键入：
 
 		gcc convert.c
 
+	>注：convert.c放在我的[github](https://github.com/wepe/MachineLearning/tree/master/SVM/libsvm%20liblinear-usage)
 
 3. 用上面得到的csv文件和a.out文件生成libsvm格式的文件, 在终端下键入:
 

SVM/libsvm liblinear-usage/convert.c

@@ -0,0 +1,121 @@
+/*
+	convert cvs data to libsvm/svm-light format 
+	Updated on Jan 11, 2014 to use strsep() instead of strtok().
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef __USE_BSD 
+char *strsep(char **stringp, const char *delim);
+#endif
+
+char buf[10000000];
+float feature[100000];
+
+int main(int argc, char **argv)
+{
+	FILE *fp;
+
+	if(argc!=2) { fprintf(stderr,"Usage %s filename\n",argv[0]); }
+	if((fp=fopen(argv[1],"r"))==NULL)
+	{
+		fprintf(stderr,"Can't open input file %s\n",argv[1]);
+	}
+
+	while(fscanf(fp,"%[^\n]\n",buf)==1)
+	{
+		int i=0,j;
+		/*
+		char *p=strtok(buf,",");
+		
+		feature[i++]=atof(p);
+
+		while((p=strtok(NULL,",")))
+			feature[i++]=atof(p);
+		*/
+
+		char *ptr=buf;
+		while (ptr != NULL)
+		{
+			char *token = strsep(&ptr, ",");
+			if (strlen(token) == 0)	
+				feature[i++] = 0.0;
+			else	
+				feature[i++] = atof(token);
+		}
+
+		//		--i;
+		/*
+		if ((int) feature[i]==1)
+			printf("-1 ");
+		else
+			printf("+1 ");
+		*/
+		//		printf("%f ", feature[1]);
+		printf("%d ", (int) feature[0]);
+		for(j=1;j<i;j++)
+			if(feature[j]!=0)
+				printf(" %d:%f",j,feature[j]);
+
+
+		printf("\n");
+	}
+	return 0;
+}
+
+#ifndef __USE_BSD 
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+char *strsep(char **stringp, const char *delim){
+	char *s;
+	const char *spanp;
+	int c, sc;
+	char *tok;
+
+	if ((s = *stringp) == NULL)
+		return (NULL);
+	for (tok = s;;) {
+		c = *s++;
+		spanp = delim;
+		do {
+			if ((sc = *spanp++) == c) {
+				if (c == 0)
+					s = NULL;
+				else
+					s[-1] = 0;
+				*stringp = s;
+				return (tok);
+			}
+		} while (sc != 0);
+	}
+}
+#endif
+