File content as of revision 0:22ebaf70b60e:

#include "calculator.h"
#include "mbed.h"
#include <stdlib.h>

/*------------------------< Function comment >------------------------*/ 
/* NAME         : constructor                                         */ 
/* PARAMETERS   : -                                                   */ 
/* RETURN VALUE : -                                                   */ 
/* DESCRIPTION  : -                                                   */ 
/*--------------------------------------------------------------------*/ 
calculator::calculator()
{

}

/*------------------------< Function comment >------------------------*/ 
/* NAME         : calculate SD                                        */ 
/* PARAMETERS   : -                                                   */ 
/* RETURN VALUE : SD value                                            */ 
/* DESCRIPTION  : -                                                   */ 
/*--------------------------------------------------------------------*/ 
float calculator::calculateSD(const float *sdData, int size)
{
    float sum = 0.0, mean, standardDeviation = 0.0;
    int i;

    if(!sdData)
    {
        return NULL;
    }
    
    for(i = 0; i < size ; i++)
    {
        sum += sdData[i];
        //pc.printf("sum = %.2f \n\r",sum);    
    }    
    mean = sum/size;
    //pc.printf("mean = %.2f \n\r",mean); 
    
    for(i = 0; i < size; i++)
    {
        standardDeviation += pow(sdData[i] - mean, 2);
        //pc.printf("standardDeviation = %.2f \n\r",standardDeviation);
    }
    return sqrt(standardDeviation / size);
}

/*------------------------< Function comment >------------------------*/ 
/* NAME         : calculate mean                                      */ 
/* PARAMETERS   : -                                                   */ 
/* RETURN VALUE : mean value                                          */ 
/* DESCRIPTION  : -                                                   */ 
/*--------------------------------------------------------------------*/
float calculator::calculateMean(const float *meanData, int size)
{
    float sum = 0.0, mean;
    int i;
    
    if(!meanData)
    {
        return NULL;
    }
    
    for(i = 0; i < size ; ++i)
    {
        sum += meanData[i];
        //pc.printf("sum = %.2f \n\r",sum);    
    }    
    mean = sum/size;
    //pc.printf("mean = %.2f \n\r",mean); 
    return mean;
}

/*------------------------< Function comment >------------------------*/ 
/* NAME         : calculate size of vector A(Ax, Ay, Az) in State 2,3 */ 
/* PARAMETERS   : -                                                   */ 
/* RETURN VALUE : size value                                          */ 
/* DESCRIPTION  : -                                                   */ 
/*--------------------------------------------------------------------*/
float calculator::calcSDVectorA(const float *arrAx, const float *arrAy, const float *arrAz, int size)
{
    float sum = 0.0, mean = 0.0;
    float standardDeviation = 0.0;
    int i; 
    float *vSize;
    
    /* check arg is not empty */
    if(!arrAx or !arrAy or !arrAz)
    {
        return NULL;
    }
    
    vSize = (float *)malloc(size*sizeof(float));
    /* check malloc is not return NULL */
    if( vSize == NULL )
    {
        return NULL;
    }
    /*--------------------------------------------------------------------*/ 
    /*                  calculate size of vector                          */ 
    /*--------------------------------------------------------------------*/ 
    for(i = 0; i < size; i++)
    {
        *(vSize + i) = sqrt( pow(arrAx[i],2) + pow(arrAy[i],2) + pow(arrAz[i],2) );   
    }    
    /*--------------------------------------------------------------------*/ 
    /*                  calculate mean of vector size                     */ 
    /*--------------------------------------------------------------------*/
    for(i = 0; i < size ; i++)
    {
        sum += *(vSize + i);
        //pc.printf("sum = %.2f \n\r",sum);    
    }    
    mean = sum/size;
    //pc.printf("mean = %.2f \n\r",mean); 
    for(i = 0; i < size; i++)
    {
        standardDeviation += pow(*(vSize + i) - mean, 2);
        //pc.printf("standardDeviation = %.2f \n\r",standardDeviation);
    }
    free(vSize);
    return sqrt(standardDeviation / size);
}   


/*------------------------< Function comment >------------------------*/ 
/* NAME         : calculate mean size of point(roll, pitch)           */ 
/* PARAMETERS   : -                                                   */ 
/* RETURN VALUE : mean value                                          */ 
/* DESCRIPTION  : -                                                   */ 
/*--------------------------------------------------------------------*/
float calculator::calcG4(const float *arrRoll, const float *arrPitch, int size)
{
    float sum = 0.0, mean = 0.0;
    int i; 
    float *pSize;
    
    /* check arg is not empty */
    if(!arrRoll or !arrPitch)
    {
        return NULL;
    }
    
    pSize = (float *)malloc(size*sizeof(float));
    /* check malloc is not return NULL */
    if( pSize == NULL )
    {
        return NULL;
    }
    /*--------------------------------------------------------------------*/ 
    /*                  calculate size of point                           */ 
    /*--------------------------------------------------------------------*/ 
    for(i = 0; i < size; i++)
    {
        *(pSize + i) = sqrt( pow(arrRoll[i],2) + pow(arrPitch[i],2) );   
    }    
    /*--------------------------------------------------------------------*/ 
    /*                  calculate mean of point size                      */ 
    /*--------------------------------------------------------------------*/
    for(i = 0; i < size ; i++)
    {
        sum += *(pSize + i);
        //pc.printf("sum = %.2f \n\r",sum);    
    }    
    mean = sum/size;
    //pc.printf("mean = %.2f \n\r",mean); 
    
    free(pSize);
    return mean;
}   
/*--------------------------------------------------------------------*/