Solved

Reading  a large number of floating point data into a dynamically allocated 2 dimensional variable

Posted on 2001-06-24
3
186 Views
Last Modified: 2010-04-02
I wrote a very very simple program to write 40000*84 floating point data into a file and then try to retrieve it back into a 2 dimensional dynamically allocated variable.

#include <stdlib.h>
#include <stdio.h>
#define TOTAL_TRAIN     40000
#define TOTAL_FEATURE     84

void main()
{
     FILE* ftest;
     ftest=fopen  
        ("C:\\windows\\desktop\\train.txt","w");
     if(ftest==NULL)     exit(0);
     
     float num=0.0;
     for(long i=0; i<(TOTAL_TRAIN*TOTAL_FEATURE); i++)
     {
          num=num+1.2;
          fprintf(ftest,"%f\n",num);
     }
     fclose(ftest);
     printf("file write done");
     
     FILE* fsort;
     long total=TOTAL_TRAIN;
     fsort=fopen
        ("C:\\windows\\desktop\\train.txt","r");
     if(fsort==NULL)     exit(0);
     
     float** features=new float* [TOTAL_TRAIN];
     for(i=0; i<TOTAL_TRAIN; i++)
          features[i]=new float [TOTAL_FEATURE];
     
     for(i=0; i<TOTAL_TRAIN; i++)
     {
          printf("%d\n",i);
          for(int j=0; j<TOTAL_FEATURE; j++)
          {              
          fscanf(fsort,"%f",&features[j][i]);
          }
     }
     
     fclose(fsort);

     printf("All features had been loaded\n");
       
        for(i=0; i<TOTAL_TRAIN; i++)
     delete [] features[i];
     delete[] features;
}
 
Writing into a file is not a problem but when I try to retrieve it back only 750*84 out of 40000*84 samples can be retrieved.
Try to run this program. If any one can find any solution can you inform me as soon as possible.

Is it due to memory problem. 40000*84*4(float point data size is 4bytes)=13.44Mbyte. I have a 64Mbyte of SDRAM, Pentium 3 600Mhz and 14Gbyte of HDD.
0
Comment
Question by:tiagrajah
  • 2
3 Comments
 
LVL 3

Accepted Solution

by:
elcapitan earned 30 total points
ID: 6223509
You have access violation.
Replace the line: fscanf(fsort,"%f",&features[j][i]);
with the line: fscanf(fsort,"%f",&features[i][j]);

--EC--
0
 
LVL 22

Expert Comment

by:nietod
ID: 6224264
alcapitan, you must have great eyes, or a much better font than I do!  :-)

Out of curiosity, was this posted as a comment or answer?
0
 
LVL 3

Expert Comment

by:elcapitan
ID: 6224286
Thanks,
I posted it as comment

--EC--
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Often, when implementing a feature, you won't know how certain events should be handled at the point where they occur and you'd rather defer to the user of your function or class. For example, a XML parser will extract a tag from the source code, wh…
Many modern programming languages support the concept of a property -- a class member that combines characteristics of both a data member and a method.  These are sometimes called "smart fields" because you can add logic that is applied automaticall…
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.

864 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now