sumif
Calculates the sum of elements in an array that satisfy a certain condition.
Interface
#include <codecogs/statistics/sumif.h>
using namespace Statistics;
Overview
The components available with this module calculate the sum of elements in an array that satisfy a certain condition. The difference between the two functions consists in the way the condition is given.
FUNCTION
sumif
This function calculates the sum of elements in an array that satisfy a certain predicate given as argument. The predicate is a user-defined function that takes as first argument each element of the array and as second argument the value of <em> cmp </em>. Three predicate functions are available with this module to provide basic relational operators, tests to see if two values are equal, or whether one is greater/lesser than the other.
Example 1
#include <iostream>
#include <codecogs/statistics/sumif.h>
int main()
{
int x[12] = {3, 5, 1, 2, 6, 8, 10, 2, 2};
std::cout << "The sum of elements equal to 2 is: ";
std::cout << Statistics::sumif<int>(12, x, 2, Statistics::isEqual);
std::cout << std::endl;
std::cout << "The sum of elements greater than 3 is: ";
std::cout << Statistics::sumif<int>(12, x, 3, Statistics::isGreater);
std::cout << std::endl;
std::cout << "The sum of elements less than 7 is: ";
std::cout << Statistics::sumif<int>(12, x, 7, Statistics::isLess);
std::cout << std::endl;
return 0;
}Output
The sum of elements equal to 2 is: 6
The sum of elements greater than 3 is: 29
The sum of elements less than 7 is: 21Parameters
Returns
FUNCTION
sumif
This function calculates the sum of <em> integers </em> in an array that satisfy a certain predicate given as argument. The predicate is given as a character string, with the following syntax: the first character is one of "=", "!", ">" or "<" to provide the relation that needs to be satisfied, where "!" means inequality. The next characters are used to specify the integer (signed or unsigned) to which the value of each element of the array is to be compared.
Example 1
#include <iostream>
#include <codecogs/statistics/sumif.h>
int main()
{
int x[12] = {3, 5, 1, 2, 6, 8, 10, 2, 2};
std::cout << "The sum of elements equal to 2 is: ";
std::cout << Statistics::sumif<int>(12, x, "=2");
std::cout << std::endl;
std::cout << "The sum of elements greater than 3 is: ";
std::cout << Statistics::sumif<int>(12, x, ">3");
std::cout << std::endl;
std::cout << "The sum of elements less than 7 is: ";
std::cout << Statistics::sumif<int>(12, x, "<7");
std::cout << std::endl;
return 0;
}Output
The sum of elements equal to 2 is: 6
The sum of elements greater than 3 is: 29
The sum of elements less than 7 is: 21