_Xform4dV (Windows CE 5.0)
Multiplies a four-dimensional vector by a 4x4 matrix.
float* _Xform4dV( float* dst, float* src, float* matrix);
Parameters
- dst
[out] Pointer to a four-dimensional destination vector. - src
[in] Pointer to a four-dimensional source vector. - matrix
[in] Pointer to an array of float values arranged such that the indices of the array are the [row][column] values of the 4x4 matrix.
Return Values
Pointer to the four-dimensional destination vector.
Remarks
The following code shows how to use _Xform4dV.
void print_matrix(float *matrix, float *src, float *dest)
{
int row, col;
printf("Matrix:\t\t\t\tSrc:\tDest:\n");
for (row = 0; row < 4; row++)
{
printf("| ");
for (col = 0; col < 4; col++)
{
printf("%6.2f", *matrix++);
}
printf(" |");
printf(" |%6.2f|", *src++);
printf("\t|%10.4f|\n", *dest++);
}
}
void main()
{
int i;
float dest[4];
float src[4] = {1.0,2.0,3.0,4.0};
float matrix[16]={ 1.0, 2.0, 3.0, 4.0,
5.0, 6.0, 7.0, 8.0,
9.0, 10.0, 11.0, 12.0,
13.0, 14.0, 15.0, 16.0};
_Xform4dV(dest, src, matrix); //[matrix]x[src[i]] --> dest[i]
print_matrix(matrix, src, dest);
}
Output
Matrix: Src: Dest:
| 1.00 2.00 3.00 4.00 | | 1.00| | 30.0000|
| 5.00 6.00 7.00 8.00 | | 2.00| | 70.0000|
| 9.00 10.00 11.00 12.00 | | 3.00| | 110.0000|
| 13.00 14.00 15.00 16.00 | | 4.00| | 150.0000|
Requirements
Header: shintr.h.
See Also
Intrinsic Functions for Renesas Microprocessors | _Xform3dV | _XDXform4dV | _XDXform3dV | _LoadMatrix | _SaveMatrix
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