CODEWITHSUNDEEP
cvectormatrixdynamic-arrays
Yuval Cohen
Yuval Cohen

Reputation: 19

what is the proper way to turn a matrix's column into a single vector in C?

int *column_to_row(int **a, int rows, int column_index)
{
// a is a the matrix,rows are the number of rows in the matrix
//column_index is the chosen column of the matrix to be turned into a vector 
     int i;
     int *b=malloc(rows*sizeof(int));// b will be my returned vector
     if(b==NULL)
     {
          exit(EXIT_FAILURE);
     }    
     for(i=0;i<rows;i++)
     {
          b[i]=a[i][column_index];
     }
     return b;
}

I keep getting this C2040 Error:

error C2040: 'column_to_row' : 'int *(int **,int,int,int)' differs in levels of indirection from 'int ()'

What am I doing wrong?

Upvotes: 0

Views: 111

Answers (1)

Bort
Bort

Reputation: 21

the function works correctly.

most likely it complains because the prototype is missing.

int *(int **,int,int,int) looks like function call does not agree with declaration cause it should be int*(int **, int ,int)

Upvotes: 1

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