function template
<valarray>
std::abs
template<class T> valarray<T> abs (const valarray<T>& x);
Compute absolute value of valarray elements
Returns a valarray containing the absolute values of all the elements of x, in the same order.
The function calls abs (unqualified) for each element.
This function is overloaded in <cstdlib> for integral types (see cstdlib abs), in <cmath> for floating-point types (see cmath abs), and in <complex> for complex numbers (see complex abs).
Parameters
- x
- valarray containing elements of a type for which the unary function abs is defined.
Return value
A valarray object with the absolute values of the elements of x.
Example
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
// abs valarray example
#include <iostream> // std::cout
#include <cstddef> // std::size_t
#include <cstdlib> // std::abs(int)
#include <valarray> // std::valarray, std::abs(valarray)
int main ()
{
int val[] = {5, 3, -10, 4, -7};
std::valarray<int> foo (val,5);
std::valarray<int> bar = abs (foo);
std::cout << "foo:";
for (std::size_t i=0; i<foo.size(); ++i)
std::cout << ' ' << foo[i];
std::cout << '\n';
std::cout << "bar:";
for (std::size_t i=0; i<bar.size(); ++i)
std::cout << ' ' << bar[i];
std::cout << '\n';
return 0;
}
|
Output:
foo: 5 3 -10 4 -7
bar: 5 3 10 4 7
|