source: issm/trunk-jpl/externalpackages/mealpix/help/html/pix2vec_help.html

Last change on this file was 25367, checked in by adhikari, 5 years ago

NEW: matlab package for analyzing spherical harmonics based on Max Tegmark's HEALpix tool
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65 </style></head><body><div class="content"><h1>pix2vec</h1><!--introduction--><p>Convert MEALPix pixel numbers to cartesian location vectors</p><!--/introduction--><h2>Contents</h2><div><ul><li><a href="#1">Syntax</a></li><li><a href="#2">Input Arguments</a></li><li><a href="#3">Return Arguments</a></li><li><a href="#4">Example</a></li><li><a href="#5">See also</a></li><li><a href="#6">Requires</a></li></ul></div><h2>Syntax<a name="1"></a></h2><pre>[x,y,z] = pix2vec(nSide,pix,'Param1',Value1,...)
66xyz = pix2vec(nSide,pix,'Param1',Value1,...)</pre><h2>Input Arguments<a name="2"></a></h2><pre>nSide HEALPix resolution parameter
67pix (optional) numeric array of pixel numbers</pre><pre>Param Value
68'nest' indexing scheme is nested (true | {false})</pre><h2>Return Arguments<a name="3"></a></h2><pre>x,y,z size(pix) size(pix) numeric array of unit vector coordinate
69 components corresponding to pixels pix
70xyz size(pix) size(pix) cell array of cartesian unit vectors
71 corresponding to pixels pix</pre><h2>Example<a name="4"></a></h2><pre class="codeinput">nSide = 2^4;
72nPix = nSide2nPix(nSide);
73pix0 = reshape(1:6,3,2);
74pix1 = reshape(nPix+(-5:0),3,2);
75pix = [pix0,pix1];
76xyz = pix2vec(nSide,pix);
77xyzn = pix2vec(nSide,pix,<span class="string">'nest'</span>,true);
78size(xyz)
79[xyz{1},xyz{end}]
80[xyzn{1},xyzn{end}]
81</pre><pre class="codeoutput">
82ans =
83
84 3 4
85
86
87ans =
88
89 0.0361 0.0361
90 0.0361 -0.0361
91 0.9987 -0.9987
92
93
94ans =
95
96 0.7065 0.7065
97 0.7065 -0.7065
98 0.0417 -0.0417
99
100</pre><h2>See also<a name="5"></a></h2><p>ang2pix, pix2ang, vec2pix</p><h2>Requires<a name="6"></a></h2><p>nest2ring</p><p>Copyright 2010-2011 Lee Samuel Finn. <a href="mealpix_notices.html">Terms of Use</a>.</p><p class="footer"><br>
101 Published with MATLAB&reg; 7.12<br></p></div><!--
102##### SOURCE BEGIN #####
103%% pix2vec
104% Convert MEALPix pixel numbers to cartesian location vectors
105
106%% Syntax
107% [x,y,z] = pix2vec(nSide,pix,'Param1',Value1,...)
108% xyz = pix2vec(nSide,pix,'Param1',Value1,...)
109
110%% Input Arguments
111% nSide HEALPix resolution parameter
112% pix (optional) numeric array of pixel numbers
113%
114% Param Value
115% 'nest' indexing scheme is nested (true | {false})
116
117%% Return Arguments
118% x,y,z size(pix) size(pix) numeric array of unit vector coordinate
119% components corresponding to pixels pix
120% xyz size(pix) size(pix) cell array of cartesian unit vectors
121% corresponding to pixels pix
122
123%% Example
124nSide = 2^4;
125nPix = nSide2nPix(nSide);
126pix0 = reshape(1:6,3,2);
127pix1 = reshape(nPix+(-5:0),3,2);
128pix = [pix0,pix1];
129xyz = pix2vec(nSide,pix);
130xyzn = pix2vec(nSide,pix,'nest',true);
131size(xyz)
132[xyz{1},xyz{end}]
133[xyzn{1},xyzn{end}]
134
135%% See also
136% ang2pix, pix2ang, vec2pix
137
138%% Requires
139% nest2ring
140
141%%
142% Copyright 2010-2011 Lee Samuel Finn. <mealpix_notices.html Terms of Use>.
143##### SOURCE END #####
144--></body></html>
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