joshpeterson/MatrixTest.cpp

## MatrixTest.cpp
#include <cstdlib>
#include <ctime>
#include <iostream>

// From http://stackoverflow.com/questions/2704521/generate-random-double-numbers-in-c
double fRand(double fMin, double fMax)
{
    double f = (double)rand() / RAND_MAX;
    return fMin + f * (fMax - fMin);
}

int main(int argc, char* argv[])
{
    int n = 5000;

    std::clock_t start = std::clock();

    double** A = (double**)malloc(sizeof(double*)*n);
    double* B = (double*)malloc(sizeof(double)*n);

    std::cout << "Starting" << std::endl;

    srand(time(NULL));

    for (int i = 0; i < n; i++)
    {
        double* row = (double*)malloc(sizeof(double)*n);
        for (int j = 0; j < n; j++)
        {
            row[j] = fRand(0.0, 1.0);
        }
        A[i] = row;
        B[i] = fRand(0.0, 1.0);
    }

    double* X = (double*)malloc(sizeof(double)*n);
    for (int i = 0; i < n; i++)
    {
        double sum = 0.0;
        for (int j = 0; j < n; j++)
        {
            sum += A[i][j] * B[i];
        }

        X[i] = sum;
    }

    double elapsed = double(std::clock() - start) / CLOCKS_PER_SEC;

    std::cout << "Done in " << elapsed << "s" << std::endl;

    return 0;
}

## MatrixTest.html
<html>
    <head>
        <title>Test Matrix</title>
        <script>
            window.onload = function()
            {
                alert("Starting");

                var start = new Date().getTime();

                n = 5000;
                var A = new Array(n);
                var B = new Array(n);
                for (i = 0; i < n; i++)
                {
                    var row = new Array(n);
                    for (j = 0; j < n; j++)
                    {
                        row[j] = Math.random();
                    }
                    A[i] = row;
                    B[i] = Math.random();
                }

                var X = new Array(n);
                for (i = 0; i < n; i++)
                {
                    var sum = 0;
                    for (j = 0; j < n; j++)
                    {
                        sum += A[i][j] * B[i];
                    }

                    X[i] = sum;
                }

                var end = new Date().getTime();
                var time = (end - start) / 1000;

                alert("Done in: " + time + "s");
            }
        </script>
    </head>
</html>
	#include <cstdlib>
	#include <ctime>
	#include <iostream>

	// From http://stackoverflow.com/questions/2704521/generate-random-double-numbers-in-c
	double fRand(double fMin, double fMax)
	{
	double f = (double)rand() / RAND_MAX;
	return fMin + f * (fMax - fMin);
	}

	int main(int argc, char* argv[])
	{
	int n = 5000;

	std::clock_t start = std::clock();

	double A = (double)malloc(sizeof(double)n);
	double* B = (double)malloc(sizeof(double)n);

	std::cout << "Starting" << std::endl;

	srand(time(NULL));

	for (int i = 0; i < n; i++)
	{
	double* row = (double)malloc(sizeof(double)n);
	for (int j = 0; j < n; j++)
	{
	row[j] = fRand(0.0, 1.0);
	}
	A[i] = row;
	B[i] = fRand(0.0, 1.0);
	}

	double* X = (double)malloc(sizeof(double)n);
	for (int i = 0; i < n; i++)
	{
	double sum = 0.0;
	for (int j = 0; j < n; j++)
	{
	sum += A[i][j] * B[i];
	}

	X[i] = sum;
	}

	double elapsed = double(std::clock() - start) / CLOCKS_PER_SEC;

	std::cout << "Done in " << elapsed << "s" << std::endl;

	return 0;
	}
	<html>
	<head>
	<title>Test Matrix</title>
	<script>
	window.onload = function()
	{
	alert("Starting");

	var start = new Date().getTime();

	n = 5000;
	var A = new Array(n);
	var B = new Array(n);
	for (i = 0; i < n; i++)
	{
	var row = new Array(n);
	for (j = 0; j < n; j++)
	{
	row[j] = Math.random();
	}
	A[i] = row;
	B[i] = Math.random();
	}

	var X = new Array(n);
	for (i = 0; i < n; i++)
	{
	var sum = 0;
	for (j = 0; j < n; j++)
	{
	sum += A[i][j] * B[i];
	}

	X[i] = sum;
	}

	var end = new Date().getTime();
	var time = (end - start) / 1000;

	alert("Done in: " + time + "s");
	}
	</script>
	</head>
	</html>