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Passing 2d Matrix and a Vector - A Robust Matrix*Vector calculating function

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I am trying to build a robust matrix*vector calculating function (MatVec) that requires me to pass a 2d square matrix A and a 1d array V with n as number of rows or columns. Two things here:

1. I don't know how to make this function return a vector X and the main function to take that vector so that it could be used later.




2. Another thing is I don't want to pass the matrix with a known column number like arr[][3] as a parameter to the function to make it more robust.

Any ideas in this particular case will be deeply appreciated.

int *MatVec(int *A,int V[],int n)

 int C[n];
 for(int i = 0; i<n;i++)
 
 C[i] = innerprod(*(A+i*n),V,n);
 
 return C;


int innerprod(int v[], int u[],int n)
 
 double result = 0.0;
 for (int i = 0; i < n; i++)
 
 result += v[i]*u[i];
 //printf("%dn",v[i]*u[i]);
 
 return result;


int main()
 
 int n = 2;
 int C[n];
 int A[2][2] = 1,2,3,4;
 int V[2] = 3,4;
 int W[2] = 7,-2;
 int *c = MatVec((int *)A,V,n);
 for(int i = 0; i < n ;i++)
 
 printf("%dn",*(c+i));
 

c arrays function matrix 2d

share|improve this question

edited Mar 22 at 10:24

meowgoesthedog

11.1k41528

asked Mar 22 at 0:56

Crossfit_JesusCrossfit_Jesus

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add a comment | 

0

0

I am trying to build a robust matrix*vector calculating function (MatVec) that requires me to pass a 2d square matrix A and a 1d array V with n as number of rows or columns. Two things here:

1. I don't know how to make this function return a vector X and the main function to take that vector so that it could be used later.




2. Another thing is I don't want to pass the matrix with a known column number like arr[][3] as a parameter to the function to make it more robust.

Any ideas in this particular case will be deeply appreciated.

int *MatVec(int *A,int V[],int n)

 int C[n];
 for(int i = 0; i<n;i++)
 
 C[i] = innerprod(*(A+i*n),V,n);
 
 return C;


int innerprod(int v[], int u[],int n)
 
 double result = 0.0;
 for (int i = 0; i < n; i++)
 
 result += v[i]*u[i];
 //printf("%dn",v[i]*u[i]);
 
 return result;


int main()
 
 int n = 2;
 int C[n];
 int A[2][2] = 1,2,3,4;
 int V[2] = 3,4;
 int W[2] = 7,-2;
 int *c = MatVec((int *)A,V,n);
 for(int i = 0; i < n ;i++)
 
 printf("%dn",*(c+i));
 

c arrays function matrix 2d

share|improve this question

edited Mar 22 at 10:24

meowgoesthedog

11.1k41528

asked Mar 22 at 0:56

Crossfit_JesusCrossfit_Jesus

125

add a comment | 

I am trying to build a robust matrix*vector calculating function (MatVec) that requires me to pass a 2d square matrix A and a 1d array V with n as number of rows or columns. Two things here:

1. I don't know how to make this function return a vector X and the main function to take that vector so that it could be used later.




2. Another thing is I don't want to pass the matrix with a known column number like arr[][3] as a parameter to the function to make it more robust.

Any ideas in this particular case will be deeply appreciated.

int *MatVec(int *A,int V[],int n)

 int C[n];
 for(int i = 0; i<n;i++)
 
 C[i] = innerprod(*(A+i*n),V,n);
 
 return C;


int innerprod(int v[], int u[],int n)
 
 double result = 0.0;
 for (int i = 0; i < n; i++)
 
 result += v[i]*u[i];
 //printf("%dn",v[i]*u[i]);
 
 return result;


int main()
 
 int n = 2;
 int C[n];
 int A[2][2] = 1,2,3,4;
 int V[2] = 3,4;
 int W[2] = 7,-2;
 int *c = MatVec((int *)A,V,n);
 for(int i = 0; i < n ;i++)
 
 printf("%dn",*(c+i));
 

c arrays function matrix 2d

share|improve this question

edited Mar 22 at 10:24

meowgoesthedog

11.1k41528

asked Mar 22 at 0:56

Crossfit_JesusCrossfit_Jesus

125

int *MatVec(int *A,int V[],int n)

 int C[n];
 for(int i = 0; i<n;i++)
 
 C[i] = innerprod(*(A+i*n),V,n);
 
 return C;


int innerprod(int v[], int u[],int n)
 
 double result = 0.0;
 for (int i = 0; i < n; i++)
 
 result += v[i]*u[i];
 //printf("%dn",v[i]*u[i]);
 
 return result;


int main()
 
 int n = 2;
 int C[n];
 int A[2][2] = 1,2,3,4;
 int V[2] = 3,4;
 int W[2] = 7,-2;
 int *c = MatVec((int *)A,V,n);
 for(int i = 0; i < n ;i++)
 
 printf("%dn",*(c+i));
 

share|improve this question

edited Mar 22 at 10:24

meowgoesthedog

11.1k41528

asked Mar 22 at 0:56

Crossfit_JesusCrossfit_Jesus

125

share|improve this question

edited Mar 22 at 10:24

meowgoesthedog

11.1k41528

asked Mar 22 at 0:56

Crossfit_JesusCrossfit_Jesus

125

edited Mar 22 at 10:24

meowgoesthedog

11.1k41528

edited Mar 22 at 10:24

meowgoesthedog

11.1k41528

asked Mar 22 at 0:56

Crossfit_JesusCrossfit_Jesus

125

asked Mar 22 at 0:56

Crossfit_JesusCrossfit_Jesus

125