Hello,

I am trying to pass a float array from a funtion. I wrote an test program to get the idea first. At first, I tried loading numbers from a file, but some were returned wrong. So I tried assigning numbers to the matrix (as in the following code) and still one came out wrong (matrix[0][1]). Does someone know where is my mistake?
Thanks


The main() file

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

void load (char *data, float (*matrix)[1]);

main()
{

char data[] = "data.txt";
FILE *input;
float matrix[1][1];
int i,j;


load(data, matrix);


for (i = 0; i<=1; i++)
{
for(j = 0; j<=1; j++)
printf("%f ",matrix[j][i]);
printf("\n");
}

printf("\n");

return 0;
}


And the function:

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




void load(char *data, float (*matrix)[1])

{

FILE *input;



matrix[0][0] = 1.00;
matrix[0][1] = 4.2;
matrix[1][0] = 10.28;
matrix[1][1] = 9.87;


return;

}

I supposed the output should be

1.000000 4.200000
10.280000 9.870000

But it actually is:
1.000000 10.280000
10.280000 9.870000

: The main() file
:
: #include <stdio.h>
: #include <stdlib.h>
:
: void load (char *data, float (*matrix)[2]);
:
: main()
: {
:
: char data[] = "data.txt";
: FILE *input;
: float matrix[2][2];
: int i,j;
:
:
: load(data, matrix);
:
:
: for (i = 0; i<=1; i++)
: {
: for(j = 0; j<=1; j++)
: printf("%f ",matrix[j][i]);
: printf("\n");
: }
:
: printf("\n");
:
: return 0;
: }
:
:
: And the function:
:
: #include <stdio.h>
: #include <stdlib.h>
:
:
:
:
: void load(char *data, float (*matrix)[2])
:
: {
:
: FILE *input;
:
:
:
: matrix[0][0] = 1.00;
: matrix[0][1] = 4.2;
: matrix[1][0] = 10.28;
: matrix[1][1] = 9.87;
:
:
: return;
:
: }
:

I made some changes in red. Basically, you were telling C that your array is 1x1, while you wanted it to be 2x2.


Best Regards,
Richard

The way I see it... Well, it's all pretty blurry

: : The main() file
: :
: : #include <stdio.h>
: : #include <stdlib.h>
: :
: : void load (char *data, float (*matrix)[2]);
: :
: : main()
: : {
: :
: : char data[] = "data.txt";
: : FILE *input;
: : float matrix[2][2];
: : int i,j;
: :
: :
: : load(data, matrix);
: :
: :
: : for (i = 0; i<=1; i++)
: : {
: : for(j = 0; j<=1; j++)
: : printf("%f ",matrix[j][i]);
: : printf("\n");
: : }
: :
: : printf("\n");
: :
: : return 0;
: : }
: :
: :
: : And the function:
: :
: : #include <stdio.h>
: : #include <stdlib.h>
: :
: :
: :
: :
: : void load(char *data, float (*matrix)[2])
: :
: : {
: :
: : FILE *input;
: :
: :
: :
: : matrix[0][0] = 1.00;
: : matrix[0][1] = 4.2;
: : matrix[1][0] = 10.28;
: : matrix[1][1] = 9.87;
: :
: :
: : return;
: :
: : }
: :
:
: I made some changes in red. Basically, you were telling C that your
: array is 1x1, while you wanted it to be 2x2.
:
:
: Best Regards,
: Richard
:
: The way I see it... Well, it's all pretty blurry

Thanks. I will try that.
You mean the coding indentation??

: Thanks. I will try that.
: You mean the coding indentation??
:


Code tags ftw:

int main()
{
  printf("Hello world");
  return 0;
}