pix2ang

Find spherical coordinate location of HEALPix pixels

Contents

Syntax

tp = pix2ang(nSide,pix,'Param1',Value1,...)

Input Arguments

nSide    HEALPix resolution parameter (positive integer power of 2)
pix      (optional) array of pixel values to find coordinates of
Param    Values
'nest'   pixels are given in nested indexing (true | {false})

Return Arguments

tp       cell array of [theta; phi] pixel locations (radians)

Example

Return [theta; phi] postion angles for all pix of nSide=4, nest scheme

nSide = 4;
tp = pix2ang(nSide,'nest',true);
size(tp)
tp{1}
% Return position angles for a random assortment of pixels
pix = randi(nSide2nPix(nSide),3,4);
tp = pix2ang(nSide,pix);
size(tp)
tp{1}
ans =

     1   192


ans =

    1.4033
    0.7854


ans =

     3     4


ans =

    1.5708
    6.0868

See also

See also ang2pix, pix2vec, vec2pix

Copyright 2010-2011 Lee Samuel Finn. Terms of Use.