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pydhaj.1
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pydhaj.1
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.\" ========================================================================
.\"
.IX Title "DHAJ 1"
.TH DHAJ 1 "2014-09-12" "SHTOOLS 3.0" "SHTOOLS 3.0"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "DHaj"
.IX Header "DHaj"
.IP "DHaj \-" 8
.IX Item "DHaj -"
Compute the latitudinal weights used in the Driscoll and Healy (1994) spherical harmonic transform.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.IP "\s-1SUBROUTINE\s0 DHaj (" 18
.IX Item "SUBROUTINE DHaj ("
N, \s-1AJ\s0 )
.RS 4
.IP "REAL*8" 10
.IX Item "REAL*8"
\&\s-1AJ\s0(N)
.IP "\s-1INTEGER\s0" 10
.IX Item "INTEGER"
N
.RE
.RS 4
.RE
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIDHaj\fR will calculate the latitudinal weights used in the spherical harmonic transform of Driscoll and Healy (1994; equation 9). The number of samples N must be even, and the transform and its inverse are implemented as \fISHExpandDH\fR and \fIMakeGridDH\fR, respectively. It is noted that the first element, corresponding to the north pole, is always zero. The element corresponding to the south pole is not included.
.SH "ARGUMENTS"
.IX Header "ARGUMENTS"
.IP "N" 10
.IX Item "N"
(input) \s-1INTEGER\s0
.Sp
The number of samples in latitude used in the spherical harmonic transform. This must be \s-1EVEN\s0.
.IP "\s-1AJ\s0" 10
.IX Item "AJ"
(output) REAL*8, \s-1DIMENSION\s0 (N)
.Sp
The latitudinal weights used in the spherical harmonic transform.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIshexpanddh\fR\|(1), \fImakegriddh\fR\|(1)
.PP
<http://shtools.ipgp.fr/>
.SH "REFERENCES"
.IX Header "REFERENCES"
Driscoll, J.R. and D.M. Healy, Computing Fourier transforms and convolutions on the 2\-sphere, \fIAdv. Appl. Math.\fR, 15, 202\-250, 1994.
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright 2012 by Mark Wieczorek <wieczor@ipgp.fr>.
.PP
This is free software; you can distribute and modify it under the terms of the revised \s-1BSD\s0 license.