2.1.17.8.13 ocmath_linear_transform

Description

Map data array slope [min, max] to [nMin, nMax] linearly

Syntax

int ocmath_linear_transform( double * pData, uint i1, uint i2, int nMin, int nMax, double dMin = __NANUM, double dMax = __NANUM, DWORD dwCntrl = 0 )

Parameters

pData

[modify] pointer to data array

i1

[input] start data index

i2

[input] end data index (inclusive)

nMin

[input] result min

nMax

[input] result max

dMin

[input] input data min to be mapped to nMin, use NANUM to get actual data min

dMax

[input] input data max to be mapped to nMax, use NANUM to get actual data max

dwCntrl

[input] bits of LNTR_NO_ROUND_NEAREST_INT etc

Return

0 if success, -1 if dMin and dMax equal

Examples

EX1

void ocmath_linear_transform_ex1()
{
     vector vx2 = {100,200,300,400,500};
     vector vx;
     vx = vx2;
     int nErr = ocmath_linear_transform(vx, 0, vx.GetSize(), 0, 255, NANUM, NANUM);
     for(int ii = 0; ii < vx.GetSize(); ii++)
     {
         int nn = vx[ii];
         printf("%d ", nn);
     }
     out_str("");
     //output should be "0 64 127 191 255" 
}

Remark

See Also

Header to Include

origin.h

Reference