Can't change global 2d array variable

I've tried creating a reference to the pointer and modifying that, like this, but that hasn't worked either.

Code:

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float **temp = &inverseMatrix;
temp[0][0] = 8;

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I've also tried setting the reference equal to another matrix by doing

Code:

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float **temp = someMatrix;

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I have no clue where to go next. I've been reading forum posts and have tried adding a * in front but that just results in compilation errors. What is the correct way to modify a global variable from a method that is not main?

Code:

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float** inverseMatrix;void change();


void printMatrix(const float **matrix, int rows, int columns);
int main()
{
        int j;
        inverseMatrix = (float**)malloc(8 * sizeof(float *));
        for (j = 0; j < 8; j++)
        {
                inverseMatrix[j] = (float*)malloc(8 * sizeof(float));


        }
        change();
        printMatrix(inverseMatrix, 8, 8);
}
void change()
{
        for (int i = 0; i < 8; i++)
        {
                for (int j = 0; j < 8; j++)
                {
                        inverseMatrix[i][j];
                }
        }
        printMatrix(inverseMatrix, 8, 8);
}

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You didn't say exactly what's wrong, but line 24 doesn't do anything. You should be getting a warning for that line. Don't ignore warnings.

What is it that you want line 24 to do?

Casting malloc - Cprogramming.com

Whoops. As I was trying to isolate the problem and reproduce it, I forgot to set it to a number. I meant to write [CODE]inverseMatrix[i][j] = j;[\CODE]. However, this still doesn't modify the matrix.

Post the smallest and simplest compilable program that demonstrates the problem.

Quote:

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Originally Posted by ColeBacha

Whoops. As I was trying to isolate the problem and reproduce it, I forgot to set it to a number. I meant to write inverseMatrix[i][j] = j;. However, this still doesn't modify the matrix.

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Yes it does. What does your print function look like? It should look something like this.

Code:

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void printMatrix(const int **m, int rows, int cols) {
  for(int r = 0; r < rows; r++) {
    for(int c = 0; c < cols; c++) {
      printf("%2d ", m[r][c]);
    }
    printf("\n");
  }
}

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