C / C++ / MFC

//
// blenderOceanStdDev.c
//
// Implementation file for the complex number functions used by the blenderOcean module
//
// Contributors:  Simon Beeching - enhzflep
//         Date:  17 feb 2008

#include <math.h>    // for sqrt
#include <stdlib.h>  // for RAND_MAX

float calcArrayAvg(float *array, long numElements)
{
    double tmp = 0;
    long i;
      
    for (i=0; i<numElements; i++)
        tmp += array[i];
    tmp /= numElements;
    return tmp;
}

float calcStdDev(float *array, long numElements, float arrayAvg)
{
      double thisDev;
      double totalDev2 = 0.0;
      double varience;
      long i;
      
      for (i=0; i<numElements; i++)
      {
          thisDev = array[i] - arrayAvg;
          totalDev2 += thisDev*thisDev;
      }
      
      varience = totalDev2 / (float)numElements;
      return sqrt(varience);
}
      
void setArrayMean(float *array, long numElements, float newMean)
{
      double oldMean = calcArrayAvg(array, numElements);
      double delta = newMean - oldMean;
      long i;
      
      for (i=0; i<numElements; i++)
          array[i] += delta;
}

void setArrayStdDev(float *array, long numElements, float oldStdDev, float newStdDev)
{
     double scale;
     long i;
     
     scale = newStdDev / oldStdDev;
     for (i=0; i<numElements; i++)
         array[i] *= scale;
}

// creates an array of numElements floats
// this array is filled with random numbers before
// being adjusted so that the mean of the numbers in the array is 0.0
// and the standard deviation is 1.0
void standard_normal(float *array, long numElements)
{
     long i;
     double mean, stdDev;
     
     for (i=0; i<numElements; i++)
         array[i] = ((float)rand()/(float)RAND_MAX);
         
     mean = calcArrayAvg(array, numElements);
     stdDev = calcStdDev(array, numElements, mean);
     setArrayMean(array, numElements, 0.0);
     setArrayStdDev(array, numElements, stdDev, 1.0);
}

Megidolaon wrote:

Could you tell me a way to get an exception without explicitly throwing one?
I want to see for myself how it works, so I can use it myself later.

Megidolaon wrote:

I'm used to everything throwing an exception the moment something doesn't work in C# but in C++ they don't seem to occur nearly as often.

--Mike--
Visual C++ MVP
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