Lines Matching refs:phi
91 my ( $rho, $theta, $phi ) = @_;
93 return ( $rho * cos( $theta ) * sin( $phi ),
94 $rho * sin( $theta ) * sin( $phi ),
95 $rho * cos( $phi ) );
331 ($rho, $theta, $phi) = cartesian_to_spherical($x, $y, $z);
333 ($rho_s, $theta, $phi) = cylindrical_to_spherical($rho_c, $theta, $z);
334 ($x, $y, $z) = spherical_to_cartesian($rho, $theta, $phi);
335 ($rho_c, $theta, $z) = spherical_to_cylindrical($rho_s, $theta, $phi);
349 coordinate. The angle from the I<z>-axis is B<phi>, also known as the
352 pi/2, rho>. In geographical terms I<phi> is latitude (northward
356 B<BEWARE>: some texts define I<theta> and I<phi> the other way round,
357 some texts define the I<phi> to start from the horizontal plane, some
383 ($rho, $theta, $phi) = cartesian_to_spherical($x, $y, $z);
391 ($rho_s, $theta, $phi) = cylindrical_to_spherical($rho_c, $theta, $z);
397 ($x, $y, $z) = spherical_to_cartesian($rho, $theta, $phi);
401 ($rho_c, $theta, $z) = spherical_to_cylindrical($rho_s, $theta, $phi);
423 I<phi> are latitudes: zero at the North Pole, northward positive,
425 geographically: the I<phi> zero is at the North Pole, not at the
456 # Notice the 90 - latitude: phi zero is at the North Pole.