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Showing content from https://TheAlgorithms.github.io/C-Plus-Plus/d0/d08/realtime__stats_8cpp_source.html below:

TheAlgorithms/C++: math/realtime_stats.cpp Source File

Go to the documentation of this file. 38

Ex2 +=

static_cast<double>

(tmp) * tmp;

42 double mean

()

const

{

return

K + Ex / n; }

45 double variance

()

const

{

return

(Ex2 - (Ex * Ex) / n) / (n - 1); }

79 double

delta = x - mu;

81 double

delta2 = x - mu;

86 double mean

()

const

{

return

mu; }

107 double

mu = 0, var = 0, M = 0;

119 float

mean = 0.f, variance = 0.f;

124 for

(

int

i = 0; i < number_of_samples; i++) {

125

stats01.

(test_data[i]);

126

stats02.

(test_data[i]);

127

mean += test_data[i];

130

mean /= number_of_samples;

132 for

(

int

i = 0; i < number_of_samples; i++) {

133 float

temp = test_data[i] - mean;

134

variance += temp * temp;

136

variance /= number_of_samples;

138

std::cout <<

"<<<<<<<< Test Function >>>>>>>>"

<< std::endl

139

<<

"Expected: Mean: "

<< mean <<

"\t Variance: "

<< variance

141

std::cout <<

"\tMethod 1:" 142

<<

"\tMean: "

<< stats01.

()

143

<<

"\t Variance: "

<< stats01.

()

144

<<

"\t Std: "

<< stats01.

() << std::endl;

145

std::cout <<

"\tMethod 2:" 146

<<

"\tMean: "

<< stats02.

()

147

<<

"\t Variance: "

<< stats02.

()

148

<<

"\t Std: "

<< stats02.

() << std::endl;

150

assert(std::abs(stats01.

() - mean) < 0.01);

151

assert(std::abs(stats02.

() - mean) < 0.01);

152

assert(std::abs(stats02.

() - variance) < 0.01);

154

std::cout <<

"(Tests passed)"

<< std::endl;

159 const float

test_data1[] = {3, 4, 5, -1.4, -3.6, 1.9, 1.};

160 test_function

(test_data1,

sizeof

(test_data1) /

sizeof

(test_data1[0]));

163

<<

"Enter data. Any non-numeric data will terminate the data input." 171

std::cout <<

"Enter number: "

;

182

std::cout <<

"\tMethod 1:" 183

<<

"\tMean: "

<< stats1.

()

184

<<

"\t Variance: "

<< stats1.

()

185

<<

"\t Std: "

<< stats1.

() << std::endl;

186

std::cout <<

"\tMethod 2:" 187

<<

"\tMean: "

<< stats2.

()

188

<<

"\t Variance: "

<< stats2.

()

189

<<

"\t Std: "

<< stats2.

() << std::endl;

friend std::istream & operator>>(std::istream &input, stats_computer1 &stat)

friend std::istream & operator>>(std::istream &input, stats_computer2 &stat)

void test_function(const float *test_data, const int number_of_samples)

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