mirror of
https://github.com/lcn2/calc.git
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42129a3672
When printing an error, calc used to print the errnum (error number):
; 1/0
Error 10001
Calc now prints the errsym (errsym):
; 1/0
Error E_DIVBYZERO
Added errsym E_LN_3 for ln(0).
Added errsym E_LOG_5 for log(0).
Added errsym E_LOG2_4 for log2(0).
Added errsym E_LOGN_6 for logn(0,base).
99 lines
3.1 KiB
Plaintext
99 lines
3.1 KiB
Plaintext
NAME
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aexcsc - inverse exterior trigonometric cosecant
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SYNOPSIS
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aexcsc(x [,eps])
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TYPES
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x number (real or complex)
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eps 0 < real < 1, defaults to epsilon()
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return real
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DESCRIPTION
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Returns the inverse exterior trigonometric cscant of x to a multiple of eps with error less in
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absolute value than .75 * eps.
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This function is sometimes called arcexcsc, is equivalent to:
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aexcsc(x) = acsc(x + 1)
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EXAMPLE
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; print aexcsc(0), aexcsc(0.5), aexcsc(1)
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1.57079632679489661923 0.72972765622696636345 0.52359877559829887308
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; print aexcsc(-0.5), aexcsc(-1)
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1.57079632679489661923-1.31695789692481670863i Error E_AEXCSC_3
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; print aexcsc(.5, 1e-5), aexcsc(.5, 1e-10), aexcsc(.5, 1e-15)
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0.72973 0.7297276562 0.729727656226966
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; print aexcsc(.5, 1e-20)
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0.72972765622696636345
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; print aexcsc(5), aexcsc(5i)
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0.16744807921968933055 0.03777750167037411869-0.19127650074191792629i
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; print aexcsc(5+5i)
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0.09818639956668015454-0.08227107131216428877i
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; pi = pi(1e-20)
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; print aexcsc(pi/6), aexcsc(pi/3)
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0.7159583700300961063 0.51033850088317613655
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; print aexcsc(4*pi/3)
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0.19393657131001704582
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LIMITS
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0 < eps < 1
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LINK LIBRARY
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NUMBER *qaexcsc(NUMBER *x, NUMBER *eps)
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COMPLEX *c_aexcsc(COMPLEX *c, NUMBER *epsilon)
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SEE ALSO
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sin, cos, tan, cot, sec, csc
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asin, acos, atan, acot, asec, acsc
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versin, coversin, vercos, covercos
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aversin, acoversin, avercos, acovercos
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haversin, hacoversin, havercos, hacovercos
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ahaversin, hacoversin, havercos, ahacovercos
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exsec, aexsec, excsc
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crd, acrd
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cas, cis
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epsilon
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EXTERNAL RESOURCES
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For general information on trigonometric functions, see:
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https://en.wikipedia.org/wiki/Trigonometric_functions#Unit-circle_definitions
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https://en.wikipedia.org/wiki/Versine
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https://en.wikipedia.org/wiki/Exsecant
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https://en.wikipedia.org/wiki/Inverse_trigonometric_functions
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https://en.wikipedia.org/wiki/Chord_(geometry)
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https://en.wikipedia.org/wiki/Secant_line
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https://en.wikipedia.org/wiki/Hartley_transform#cas
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https://en.wikipedia.org/wiki/Cis_(mathematics)
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## Copyright (C) 2023 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: 2023/09/30 23:22:21
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## File existed as early as: 2023
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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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