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1 /*
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2 * Copyright 2010 OpenSourceStewardshipFoundation.org
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3 * Licensed under GNU General Public License version 2
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4 *
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5 * Author: seanhalle@yahoo.com
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6 *
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7 */
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8
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9 #include "Histogram.h"
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10 #include <malloc.h>
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11
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12
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13 /*This Histogram Abstract Data Type has a number of bins, the starting
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14 * value, and the width of each bin, as a float, all chosen at creation.
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15 *
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16 *One creates a Histogram instance using the makeFloatHistogram function, then
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17 * updates it with the addToFloatHist function, and prints it out with the
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18 * printFloatHist function.
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19 *
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20 *Note, the bin width is an integer, so the end of the range is adjusted
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21 * accordingly. Use the bin-width to calculate the bin boundaries.
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22 */
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23
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24
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25 FloatHist *
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26 makeFloatHistogram( int32 numBins, float32 startOfRange, float32 binWidth )
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27 {
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28 FloatHist *hist;
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29 int i;
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30
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31 hist = malloc( sizeof(FloatHist) );
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32 hist->bins = malloc( numBins * sizeof(int) );
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33
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34 hist->numBins = numBins;
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35 hist->binWidth = binWidth;
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36 hist->endOfRange = startOfRange + hist->binWidth * numBins;
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37 hist->startOfRange = startOfRange;
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38
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39 for( i = 0; i < hist->numBins; i++ )
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40 {
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41 hist->bins[ i ] = 0;
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42 }
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43
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44 return hist;
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45 }
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46
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47
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48 /*All values higher than or equal to a bin's start value and less than the
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49 * start value of the next higher are put into that bin.
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50 */
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51 void
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52 addToFloatHist( float32 value, FloatHist *hist )
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53 {
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54 int binIdx;
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55
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56 if( value < hist->startOfRange )
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57 { binIdx = 0;
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58 }
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59 else if( value > hist->endOfRange )
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60 { binIdx = hist->numBins - 1;
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61 }
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62 else
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63 { //truncate so bin holds: binStartVal =< values < nextBinStartVal
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64 binIdx = (int32)((value - hist->startOfRange) / hist->binWidth);
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65 }
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66
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67 hist->bins[ binIdx ] += 1;
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68 }
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69
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70 void
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71 printFloatHist( FloatHist *hist )
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72 {
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73 int32 binIdx, i, numBars, maxHeight;
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74 float32 barValue, binStart, binEnd;
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75
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76 maxHeight = 0;
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77 for( i = 0; i < hist->numBins; i++ )
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78 {
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79 if( maxHeight < hist->bins[ i ] ) maxHeight = hist->bins[ i ];
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80 }
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81 barValue = maxHeight / 40; //40 spaces across page for tallest bin
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82
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83 printf("histogram: \n");
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84 if( barValue == 0 ) printf("error printing histogram\n");
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85 for( binIdx = 0; binIdx < hist->numBins; binIdx++ )
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86 {
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87 binStart = hist->startOfRange + hist->binWidth * binIdx;
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88 binEnd = binStart + hist->binWidth;
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89 printf("bin range: %3f - %3f", binStart, binEnd );
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90
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91 numBars = hist->bins[ binIdx ] / barValue;
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92 //print one bin, height of bar is num dashes across page
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93 for( i = 0; i < numBars; i++ )
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94 {
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95 printf("-");
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96 }
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97 printf("\n");
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98 }
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99 }
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100
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