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Re: Question about DayOfWeek

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126205] Re: Question about DayOfWeek
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Wed, 25 Apr 2012 00:33:07 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201204240934.FAA24505@smc.vnet.net>
  • Reply-to: drmajorbob at yahoo.com

Use === (SameQ) rather than == (Equal).

To Equal, it is possible that Wednesday and Thursday are symbols with  
equal value.

Clear[x, y]
x == y
x == y (* returns unevaluated, since x and y may or may not be equal *)

x === y
False (* different expressions are not the same *)

Bobby

On Tue, 24 Apr 2012 04:34:58 -0500, 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?
>


-- 
DrMajorBob at yahoo.com



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