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Re: Question about DayOfWeek

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126217] Re: Question about DayOfWeek
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Wed, 25 Apr 2012 00:37:16 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201204240934.FAA24505@smc.vnet.net>

Needs["Calendar`"]

Equal can only compare "between numbers or other raw data, such as
strings." If symbols are involved the expression will be interpreted
by Mathematica as an equation.

Head /@ {Wednesday, Thursday}

{Symbol, Symbol}

You need to use SameQ ( === ) to test whether symbols are literally
the same symbol.

Wednesday === Thursday

False

DayOfWeek[{1975, 1, 1}] === Wednesday

True

DayOfWeek[{1975, 1, 1}] === Thursday

False

Alternatively,

ToString[Wednesday] == ToString[Thursday]

False

ToString /@ (DayOfWeek[{1975, 1, 1}] == Thursday)

False


Bob Hanlon


On Tue, Apr 24, 2012 at 5:34 AM, Kent Holing <KHO at statoil.com> wrote:
> DayOfWeek[{1975,1,1}]==Wednesday gives True (as it should), but DayOfWeek[{1975,1,1}]==Thursday gives
> Wednesday == Thursday and not False, as it should? Why is it so?
>



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