Statistic-library for C

This repository contains a statistic library for the C programming language which prepare useful functions for dealing with average, standard deviation etc. The library is platform-independent. So you can use this library with any C-compiler.

Usage

You needed to put in the files statistic.h and statistic.c in your project directory. After that you include the header file statistic.h in your project. Then you can use the functions of this library. You will find the files statistic.h and statistic.c in the directory src.

Overview about the functions

The first int-argument represents the size of the sample (double-array).

/*
    Computes the average of a given sample.
    The sample is a set of double values.
    The average-function gets a variable number of arguments. 
    The first argument must be the number of arguments!
    The averageArray-function instead gets a double-array of values and a int-number that
    represents the size of the double-array.
*/
double average_Array(int,const double[]);
double average(int,...);

/* 
    Computes the standard deviation (n-1)
*/
double standard_deviation(int,...);
double standard_deviation_array(int, const double[]);

/*
    Computes the standard deviation (n)
*/
double standard_deviation_N(int,...);
double standard_deviation_N_array(int, const double[]);

/*
    variance: computes the variance (n-1)
    variance_N: computes the variance (n)
*/
double variance(int, const double[]);
double variance_N(int, const double[]);

/*
    gets the max (min) element of the sample 
*/
double max(int, const double[]);
double min(int , const double[]);

/*
    computes the median of the sample
*/
double median(int, const double[]);

/*
    adds up all values of the sample.
*/
double sum(int,const double[]);

/* 
    computes the range of the sample.
*/
double range(int, const double[]);

/*
    gets the frequency of the last argument (double) of that sample.
*/
double frequency_of(int, const double[], double);

/* 
    quartile_I: computes the first quartile.
    quartile_III: computes the third quartile.
    The second quartile is the median!
*/
double quartile_I(int, const double[]);
double quartile_III(int, const double[]);

/*
    computes the quartile distance
*/
double quartile_distance(int, const double[]);

Running the tests

You navigate in the directory of this repository and type in the console:

gcc -o myTests test/test.c src/statistic.c  -lcunit -lm  && ./myTests

Dependencies for tests

• CUnit
• gcc