[Date Index]
[Thread Index]
[Author Index]
Re: Simplify[expr] bug?
*To*: mathgroup at smc.vnet.net
*Subject*: [mg53408] Re: [mg53398] Simplify[expr] bug?
*From*: Ken Tozier <kentozier at comcast.net>
*Date*: Mon, 10 Jan 2005 01:42:02 -0500 (EST)
*References*: <200501100404.XAA14039@smc.vnet.net> <41E21453.1080603@math.umass.edu>
*Sender*: owner-wri-mathgroup at wolfram.com
On Jan 10, 2005, at 12:36 AM, Murray Eisenberg wrote:
> NO, it's not a bug!
>
> Before attempting such things, it behooves you to read a couple of
> pages of the documentation that accompanies Mathematica. Just about
> ANY source of such documentation would explain that (in the default
> input mode for Mathematica expressions), you surround arguments of
> functions in [square brackets], whereas (parentheses) are used solely
> as punctuation.
>
> What you entered means: Sin * a - Sin * b. so Mathematica correctly
> simplfied that by factoring out the expression Sin.
>
> What presumably you want to enter is:
>
> Simplify[Sin[a] - Sin[b]]
>
> But since Mathematica knows nothing about a or b, it will return
> Sin[a] - Sin[b] as result.
>
> The same problem is the case with your second alleged bug.
>
> Plesae try not to suggest attributing the term "bug" to Mathematica
> behavior you do not yet understand!
>
> Best wishes for getting started productively with Mathematica.
Duly chastised : )
I come from a C background so the "(" and ")" looked like a perfectly
reasonable way to call a function. It's just one of those blind spot
things.
Thanks for the info.
Ken
>
>
> Ken Tozier wrote:
>> I'm a complete newbie to Mathematica and not a math whiz, but the
>> results I got from the following two equations seems like bugs to me.
>> Test 1:
>> Running: Simplify[Sin(a) - Sin(b)]
>> Yeilds: (a - b)Sin
>> Looks like it's treating the function "Sin" like a coefficient
>> Test 2:
>> Running: Simplify[d/s + Cos(2*¹*v/s) - Cos(2*¹*(v - 1)/s)]
>> Yeilds: (d + 2 Cos ¹) / s
>> Mathematica completely factors out the variable "v" which is critical
>> to the correct solution.
>> Are these bugs or am I making an inadvertent syntax error.
>> Thanks,
>> Ken Tozier
>
> --
> Murray Eisenberg murray at math.umass.edu
> Mathematics & Statistics Dept.
> Lederle Graduate Research Tower phone 413 549-1020 (H)
> University of Massachusetts 413 545-2859 (W)
> 710 North Pleasant Street fax 413 545-1801
> Amherst, MA 01003-9305
>
>
Prev by Date:
**Re: Simplify[expr] bug?**
Next by Date:
**Re: direct product of two sets**
Previous by thread:
**Re: Simplify[expr] bug?**
Next by thread:
**Re: Simplify[expr] bug?**
| |