Need simple code for large file handling

Hi all,

I need a simple code for storing numeric data into a 2D matrix (consider dimensions are unknown) from a data-numeric format file.

The file is uploaded here...

http://archive.ics.uci.edu/ml/machin...n.data-numeric

I have tried but somehow failed.

Need your cooperation,

thanks.

somehow failed

is very descriptive bug report
Read this: http://cboard.cprogramming.com/annou...t.php?f=4&a=39

post your last code
describe your problem (what you expect, what you get, how it is different)
ask for directions

I'm extremely sorry. I have forgot to post my code. Here it is...

Code:

#include <stdio.h>
#include <stdlib.h>

struct matrix
{
	int nRow;
	int nCol;
	float **m;
};

typedef struct matrix *data;

data getdata(char file_path_name[])
{
	FILE *db;
	int ch;
	int i, j, cols;
	int rows = 0, entries = 0;

	data ptrdata=(data)malloc(sizeof(data*)) ;
	db = fopen(file_path_name, "r");

	printf("\nCollecting information...\n");

	while(1)
		{
			ch=fgetc(db);
			if(ch==EOF)
				{
					//rows++;
					//entries++;
					break;
					}
			if(ch=='\n')
				{
					rows++;
					entries++;
					}
			if(ch==' ')
			entries++;
			}

	fclose(db);

	cols = entries/rows;

	printf("\nData contains %d rows and %d columns\n", rows, cols);

	ptrdata->nRow = rows;
	ptrdata->nCol = cols;

	db = fopen("data.dat", "r");
	ptrdata->m = (float **) malloc(rows * sizeof(float *));

	for(i = 0; i < rows; i++)
		ptrdata->m[i] = (float *) malloc(cols * sizeof(float));

	for(i = 0; i < rows; i++)
		for(j = 0; j < cols; j++)
			fscanf(db, "%f", &(ptrdata->m[i][j]));

	fclose(db);
	return ptrdata;
}

int main()
{
	 char file_path_name[100];
	 data pb;
	 int i, j;

	 printf("Provide name of the file (including path):\n");
	 gets(file_path_name); //data.dat

	 pb = getdata(file_path_name);

	 printf("\nPrinting data matrix...\n\n");

	 for(i = 0; i < pb->nRow; i++)
	 //for(i = 0; i < 5; i++)
	 {
		for(j = 0; j < pb->nCol; j++)
		//for(j = 0; j < 5; j++)
		{
			printf("%.2f ",*(*((pb->m)+i)+j));
			}
		putchar('\n');
		}
	 free(pb);
	 return 0;
	 }

You still haven't said "what you expect, what you get, how it is different" -- which was good advice. As such, I'll have to guess.

Some general guidelines:

• Don't use gets(), it's dangerous. cpwiki.sf.net/Gets
• You should free() your malloc()'d memory when you're done with it. (All dimensions.)

As for your problem:

Code:

	for(i = 0; i < rows; i++)
		for(j = 0; j < cols; j++)
			fscanf(db, "&#37;f", &(ptrdata->m[i][j]));

Try switching those for loops around . . . .

Code:

	db = fopen(file_path_name, "r");

	db = fopen("data.dat", "r");

you still have not fixed this
as well as other notes made in the previos thread