pix2vec

Convert MEALPix pixel numbers to cartesian location vectors

Contents

Syntax
Input Arguments
Return Arguments
Example
See also
Requires

Syntax

[x,y,z] = pix2vec(nSide,pix,'Param1',Value1,...)
xyz = pix2vec(nSide,pix,'Param1',Value1,...)

Input Arguments

nSide       HEALPix resolution parameter
pix         (optional) numeric array of pixel numbers

Param       Value
'nest'      indexing scheme is nested (true | {false})

Return Arguments

x,y,z       size(pix) size(pix) numeric array of unit vector coordinate
            components corresponding to pixels pix
xyz         size(pix) size(pix) cell array of cartesian unit vectors
            corresponding to pixels pix

Example

nSide = 2^4;
nPix = nSide2nPix(nSide);
pix0 = reshape(1:6,3,2);
pix1 = reshape(nPix+(-5:0),3,2);
pix = [pix0,pix1];
xyz = pix2vec(nSide,pix);
xyzn = pix2vec(nSide,pix,'nest',true);
size(xyz)
[xyz{1},xyz{end}]
[xyzn{1},xyzn{end}]

ans =

     3     4


ans =

    0.0361    0.0361
    0.0361   -0.0361
    0.9987   -0.9987


ans =

    0.7065    0.7065
    0.7065   -0.7065
    0.0417   -0.0417

See also

ang2pix, pix2ang, vec2pix

Requires

nest2ring

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