HP VXI 75000 C Series, User'S And Scpi Programming Manual

Page: 374 / 438

374 Generating User Defined Functions Appendix F
return ( r );
}
/*F******************************************************************
* NAME: static int32 round32f()
*
* TASK: Rounds a 32-bit floating point number.
*/
static int32 round32f( float64 number )
{
/* add or subtract 0.5 to round based on sign of number */
float64 half = (number > 0.0 )? 0.5 : -0.5 ;
return( (int32)( half ) );
}
/*F******************************************************************
* NAME: static float64 my_function()
*
* TASK: User-supplied function for calculating desired results of f(x).
*
* HAVERSINE
*/
float64 my_function( float64 input )
{
float64 returnValue;
returnValue = sin(input);
return( returnValue );
}
/*F******************************************************************
* NAME: void Build_table()
*
* TASK: Generates tables of mx+b values used for Custom Functions
*
in the E1415A.
*
* Generate the three coefficients for the CUSTOM FUNCTION algorithm:
* a. The "exponent" value
* b. The "slope" or "M" value
* c. The "intercept" or "B" value.
*
* INPUT PARAMETERS:
* float64 max_input - maximum input expected
* float64 min_input - minimum input expected
* float64 (*custom_function)( float64 input )
* - pointer to user function
* OUTPUT PARAMETERS
* float64 *range - returned table range
* float64 *offset - returned table offset
* uint16 *conv_array - returned coeficient array:
* (512 values for piecewise)
*
*F*/
void Build_table(float64 max_input, float64 min_input,
float64 (*custom_function)( float64 input ),
float64 *range, float64 *offset,