# find the determinant of the matrix using C

Jan 19th, 2015
HelloWorld
Category:
Computer Science
Price: \$10 USD

Question description

Can anyone please debug it. It's supposed to find the determinant of the matrix and the problem is in the second function. I'm a beginner and it's due soon. I have spent 12+ hours straight on just debugging. TBH I just want someone to give me the fixed code and give a quick and simple how. Whoever can do that will be rewarded \$10. The answers are supposed to be "The determinant of the matrix in matrix2.txt is 6080 The determinant of the matrix in matrix1.txt is -413 " heres the assignment lab1(5).pdf . assume that the header is fine as well as all the other parts cause i tested them. #include "lab1.h"

void findDeterminant(char filename[STRINGSIZE])

{

int det = 0;

int i, j;

int matrix[MATSIZE][MATSIZE];

FILE *fp3=fopen(filename, "r");

for (i = 0; i<MATSIZE; i++)

{

for (j = 0; j < MATSIZE; j++)

{

fscanf(fp3,"%d",&matrix[i][j]);

}

}

fclose(fp3);

det = determinant (MATSIZE, matrix);

printf("The determinant of the matrix in %s is %d\n", filename, det);

}

int determinant(int n, int matrix[n][n])

{

int det = 0;

int power, i, j, l;

int newMAT[n-1][n-1];

if (n == 2)

{

det = (matrix[0][0]* matrix [1][1]) - (matrix[1][0]*matrix[0][1]);

printf("the determinant of the 2x2 is %d\n", det);

return det;

}

else if (n == 1){

det = matrix [0][0];

return  det;

}

else {

for(l=0;l<n;l++)

{

int h = 0,k = 0;

for(i=1;i<n;i++)

{

for(j=0;j<n;j++)

{

if(j==l)

continue;

newMAT[h][k] = matrix[i+1][j];

k++;

if(k == n-1)

if(k == n-1)

{

h++;

k=0;

}

}

}

if (l%2 == 0)

{

det += matrix[0][l] * determinant ((n-1), newMAT);

return det;

}

else

{

det -= matrix[0][l] * determinant ((n-1), newMAT);

return det;

}

}

}

}

(Top Tutor) Daniel C.
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School: UCLA

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