Namespace
Varianti

std::proj<div class="t-tr-text">(Std :: complesso)<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">(std::complex)</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>

Da cppreference.com.
< cpp‎ | numeric‎ | complex

 
 
Numeri libreria
Comuni funzioni matematiche
Virgola mobile ambiente
I numeri complessi
Array numerici
Pseudo-casuale generazione
In fase di compilazione aritmetica razionale (C++11)
Generici operazioni numeriche
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
I numeri complessi
Membri funzioni
Original:
Member functions
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complex::complex
complex::operator=
complex::real
complex::imag
complex::operator+=
complex::operator-=
complex::operator*=
complex::operator/=
Non membri funzioni
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Non-member functions
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operator==
operator!=
operator<<
operator>>
real
imag
abs
arg
norm
conj
proj(C++11)
polar
Funzioni esponenziali
Original:
Exponential functions
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exp
log
log10
Funzioni di risparmio energia
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Power functions
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pow
sqrt
Funzioni trigonometriche
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Trigonometric functions
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asin(C++11)
acos(C++11)
atan(C++11)
Funzioni iperboliche
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Hyperbolic functions
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asinh(C++11)
acosh(C++11)
atanh(C++11)
 
Defined in header <complex>
template< class T >
complex<T> proj( const complex<T>& z );
(dal C++11)
Restituisce la proiezione del z numero complesso sulla sfera Riemann.
Original:
Returns the projection of the complex number z onto the Riemann sphere.
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Per la maggior parte z, std::proj(z)==z, ma tutti gli infiniti complessi, anche i numeri in cui un componente è infinito e l'altro è NaN, diventare reale positivo infinito, (INFINITY, 0) o (INFINITY, -0). Il segno dell'immaginario (zero) componente è il segno di std::imag(z).
Original:
For most z, std::proj(z)==z, but all complex infinities, even the numbers where one component is infinite and the other is NaN, become positive real infinity, (INFINITY, 0) or (INFINITY, -0). The sign of the imaginary (zero) component is the sign of std::imag(z).
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Indice

[modifica] Parametri

z -
valore complesso
Original:
complex value
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[modifica] Valore di ritorno

la proiezione di z sulla sfera di Riemann
Original:
the projection of z onto the Riemann sphere
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[modifica] Esempio

#include <iostream>
#include <complex>
 
int main()
{
    std::complex<double> c1(1, 2);
    std::cout << "proj" << c1 << " = " << std::proj(c1) << '\n';
 
    std::complex<double> c2(INFINITY, -1);
    std::cout << "proj" << c2 << " = " << std::proj(c2) << '\n';
 
    std::complex<double> c3(0, -INFINITY);
    std::cout << "proj" << c3 << " = " << std::proj(c3) << '\n';
}

Output:

proj(1,2) = (1,2)
proj(inf,-1) = (inf,-0)
proj(0,-inf) = (inf,-0)

[modifica] Vedi anche

restituisce la grandezza di un numero complesso
Original:
returns the magnitude of a complex number
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(funzione di modello) [edit]
restituisce la grandezza quadrato
Original:
returns the squared magnitude
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(funzione di modello) [edit]
costruisce un numero complesso di ampiezza e di fase
Original:
constructs a complex number from magnitude and phase angle
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(funzione di modello) [edit]