multi dimensional arrays using C

[Allanon]

Hi, I've been trying to dynamically dimension a multidimensional array using C but I keep getting a compiler error. I've tried going through the help files example, but theres didn't work. Thanks for any help

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

int rows=3,columns=5;
void main(void)
{
  float *matrix=NULL;
  int i,j;
  matrix = (float*)calloc(rows, sizeof(float*));

  for (i=0; i<rows; ++i)
  {
    matrix[i] =(float*)calloc(columns,sizeof(float*));
  }
  for (i=0; i<rows; i++)
  {
    for (j=0; j<columns; j++)
    {
      //matrix[i][j] = i+j;
    }
  }
  for (i=0; i<rows; ++i) 
  {
    printf("\n\n");
    for (j=0; j<columns; ++j)
    {
      printf("%5.2Lf", matrix[i]);
    }
  }
  for (i=0; i<rows; i++)
  {
    //free(matrix[i]);
  }
  free(matrix);   
  getch();
}