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116 lines
3.7 KiB
Plaintext
116 lines
3.7 KiB
Plaintext
NAME
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d2dm - convert degrees into degrees, and minutes
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SYNOPSIS
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d2dm(degs, d, m [,rnd])
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TYPES
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degs real
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d null-or-real-valued lvalue with assign-to permission
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m null-or-real-valued lvalue with assign-to permission
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rnd nonnegative integer, defaults to config("mod")
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return mod(degs, 360, rnd)
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DESCRIPTION
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Convert degs degrees into d degrees, and m minutes.
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The return value is a normalized number of degrees, and is equivalent
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to the following:
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return_value = mod(degs, 360, rnd);
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The argument rnd, if not given, defaults to config("mod").
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For more information on the effects of rnd, see "help mod".
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Depending on the rounding mode, the return could be a real value
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in the interval [0, 360) or a real value in the interval (-360, 0].
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For the default round mode, the return value is in the interval [0, 360).
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The d argument will be an integer number of degrees.
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The value d will be set as if the following were used:
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d = int(return_value);
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For some rounding modes, d will be an integer in the interval [0, 360).
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For other rounding modes, d will be an integer in the interval (-360, 0].
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For the default round mode, d is in the interval [0, 360).
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The m argument will be a real number of minutes.
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The value m will be set as if the following were used:
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tmp = return_value - d;
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m = tmp * 60;
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free(tmp);
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For some rounding modes, m will be a real value in the interval [0, 60).
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For other rounding modes, m will be a real value in the interval (-60, 0].
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For the default round mode, m will be in the interval [0, 60).
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The following shows relationship between the return value and the resulting
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d, and m values:
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return_value == d + m/60;
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EXAMPLE
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; ## if args are undefined, pre-declare them or assign them as args
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; global d, m;
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; print d2dm(12.3456,d,m), d, m;
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12.3456 12 20.736
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; print d2dm(1234.5678,d,m), d, m;
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154.5678 154 34.068
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; print d2dm(-1234.5678,d,m), d, m;
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205.4322 205 25.932
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; print d2dm(654.321,deg=,min=), deg, min;
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294.321 294 19.26
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; print d2dm(-654.321,deg=,min=), deg, min;
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65.679 65 40.74
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; print d2dm(360.321,deg=,min=), deg, min;
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0.321 0 19.26
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; ## certain non-default rounding modes can return negative values
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; print d2dm(654.321,deg=,min=,1), deg, min;
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-65.679 -65 -40.74
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; print d2dm(-654.321,deg=,min=,1), deg, min;
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-294.321 -294 -19.26
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; print d2dm(360.321,deg=,min=,1), deg, min;
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-359.679 -359 -40.74
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LIMITS
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none
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LINK LIBRARY
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none
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SEE ALSO
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config, d2dms, dm2d, dms2d, g2gm, g2gms, gm2g, gms2g,
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h2hm, h2hms, hm2d, hms2d, mod
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## Copyright (C) 2021 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## Under source code control: 2021/09/25 17:24:51
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## File existed as early as: 2021
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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