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_Dot3dVW0 (Windows Embedded CE 6.0)

  • Article

1/5/2010

Computes the inner product of a pair of three or four-dimensional vectors with the "w" coordinate forced to 0.

Syntax

float _Dot3dVW0( 
  float* vector1, 
  float* vector2 
);

Parameters

  • Vector1
    [in] Pointer to a three or four-dimensional source vector.
  • Vector2
    [in] Pointer to a three or four-dimensional destination vector.

Return Values

The scalar resulting from the inner product.

Remarks

The fourth coordinate of a source vector will always force to 0.

To implement this function, use the /Qsh4/Oi (Generate Intrinsic Functions) flag when compiling.

The following code example shows how to use Dot3dVW0 to compute the inner products of three or four dimensional vectors.

/***********************************************************/
#include <stdio.h>
#include <shintr.h>
void main()
{
     float result;
     float v1[4]={1.0,2.0,3.0,4.0};
     float v2[4]={2.0,3.0,4.0,5.0};
     result = _Dot3dVW0(v1,v2);
/***********************************************************/
     printf("result=%f\n", result);
}

This example results in the following output.

result=20.000000

Requirements

Architecture SH-4
Header shintr.h
Routine _Dot3dVW0

See Also

Reference

Intrinsic Functions for Renesas Microprocessors
_Dot4dV
_Dot3dVW1