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<h3 class="section">20.9 Examples</h3>
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<p>Here is a basic example of how to use the statistical functions:
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<pre class="example"><pre class="verbatim"> #include <stdio.h>
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#include <gsl/gsl_statistics.h>
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double data[5] = {17.2, 18.1, 16.5, 18.3, 12.6};
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double mean, variance, largest, smallest;
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mean = gsl_stats_mean(data, 1, 5);
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variance = gsl_stats_variance(data, 1, 5);
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largest = gsl_stats_max(data, 1, 5);
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smallest = gsl_stats_min(data, 1, 5);
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printf ("The dataset is %g, %g, %g, %g, %g\n",
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data[0], data[1], data[2], data[3], data[4]);
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printf ("The sample mean is %g\n", mean);
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printf ("The estimated variance is %g\n", variance);
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printf ("The largest value is %g\n", largest);
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printf ("The smallest value is %g\n", smallest);
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<p>The program should produce the following output,
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<pre class="example"><pre class="verbatim"> The dataset is 17.2, 18.1, 16.5, 18.3, 12.6
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The sample mean is 16.54
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The estimated variance is 4.2984
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The largest value is 18.3
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The smallest value is 12.6
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<p>Here is an example using sorted data,
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<pre class="example"><pre class="verbatim"> #include <stdio.h>
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#include <gsl/gsl_sort.h>
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#include <gsl/gsl_statistics.h>
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double data[5] = {17.2, 18.1, 16.5, 18.3, 12.6};
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double median, upperq, lowerq;
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printf ("Original dataset: %g, %g, %g, %g, %g\n",
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data[0], data[1], data[2], data[3], data[4]);
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gsl_sort (data, 1, 5);
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printf ("Sorted dataset: %g, %g, %g, %g, %g\n",
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data[0], data[1], data[2], data[3], data[4]);
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= gsl_stats_median_from_sorted_data (data,
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= gsl_stats_quantile_from_sorted_data (data,
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= gsl_stats_quantile_from_sorted_data (data,
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printf ("The median is %g\n", median);
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printf ("The upper quartile is %g\n", upperq);
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printf ("The lower quartile is %g\n", lowerq);
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<p>This program should produce the following output,
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<pre class="example"><pre class="verbatim"> Original dataset: 17.2, 18.1, 16.5, 18.3, 12.6
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Sorted dataset: 12.6, 16.5, 17.2, 18.1, 18.3
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The upper quartile is 18.1
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The lower quartile is 16.5
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