bug#4031: calc simplification problem

bug#4031: calc simplification problem

[Colin Williams]

In calc, doing `a s' simplifies "(1 + cos(x)^2 - 1) / cos(x)" to
"cos(x)^2 sec(x)", which contradicts an example in the tutorial on
rewrite rules.

Colin

bug#4031: calc simplification problem

[Jay Belanger]

Colin Williams <lackita@gmail.com> writes:

> In calc, doing `a s' simplifies "(1 + cos(x)^2 - 1) / cos(x)" to
> "cos(x)^2 sec(x)", which contradicts an example in the tutorial on
> rewrite rules.

So it does.  Calc needs to simplify expressions with secant (and
cosecant and cotangent) better.  I'll be out of town for the next week;
I'll fix it as soon as I get back.

Jay

bug#4031: marked as done (calc simplification problem)

[Emacs bug Tracking System]

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and subject line Re: calc simplification problem
has caused the Emacs bug report #4031,
regarding calc simplification problem
to be marked as done.

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From: Colin Williams <lackita@gmail.com>
To: bug-gnu-emacs@gnu.org
Subject: calc simplification problem
Date: Tue, 4 Aug 2009 10:28:58 -0400
Message-ID: <1b97198a0908040728u21355fccjd9e7c485958ba471@mail.gmail.com>

In calc, doing `a s' simplifies "(1 + cos(x)^2 - 1) / cos(x)" to
"cos(x)^2 sec(x)", which contradicts an example in the tutorial on
rewrite rules.

Colin



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From: Jay Belanger <jay.p.belanger@gmail.com>
To: 4031-done@emacsbugs.donarmstrong.com
Cc: jay.p.belanger@gmail.com
Subject: Re: calc simplification problem
Date: Sat, 24 Oct 2009 15:58:10 -0500
Message-ID: <87k4ykmrvh.fsf@gmail.com>


> In calc, doing `a s' simplifies "(1 + cos(x)^2 - 1) / cos(x)" to
> "cos(x)^2 sec(x)", which contradicts an example in the tutorial on
> rewrite rules.

The simplification rules were adjusted, and the example was changed to
match the rules.

bug#4031: calc simplification problem

[Chong Yidong]

Jay Belanger <jay.p.belanger@gmail.com> wrote:

> > In calc, doing `a s' simplifies "(1 + cos(x)^2 - 1) / cos(x)" to
> > "cos(x)^2 sec(x)", which contradicts an example in the tutorial on
> > rewrite rules.

> So it does.  Calc needs to simplify expressions with secant (and
> cosecant and cotangent) better.  I'll be out of town for the next week;
> I'll fix it as soon as I get back.

Hi Jay,

Did you get around to fixing this?  If so, this bug should be closed.

bug#4031: calc simplification problem

[Jay Belanger]

Chong Yidong <cyd@stupidchicken.com> writes:
...
>> > In calc, doing `a s' simplifies "(1 + cos(x)^2 - 1) / cos(x)" to
>> > "cos(x)^2 sec(x)", which contradicts an example in the tutorial on
>> > rewrite rules.
...
> Hi Jay,
>
> Did you get around to fixing this?

Yes.

> If so, this bug should be closed.

Sorry; I'll take care of it now.

Jay