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boundary="2164780-1011759679-1397106229=:8794" X-Mailman-Approved-At: Thu, 10 Apr 2014 08:47:40 +0200 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: Kim Plofker List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 175 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1397112461 news.xs4all.nl 2974 [2001:888:2000:d::a6]:35600 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:70018 --2164780-1011759679-1397106229=:8794 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Thanks, the % operator is indeed what I want, but I want to use it with a f= unction expression rather than with numbers alone. =C2=A0And that seems to = create a type error.=0A=0AHere's an example of what goes wrong:=0A=0At =3D = var('t')=0A=0AL(t) =3D t*725.5%360.0=0A=0A=0AThis produces the following er= ror message:=0A=0A...=0ATypeError: unsupported operand type(s) for %:=0A'sa= ge.symbolic.expression.Expression' and=0A'sage.symbolic.expression.Expressi= on'=0A=0AI can use other arithmetic operators such as + and / in this funct= ion expression, but not %, and I don't understand why. =C2=A0Is it indeed a= Sage-specific problem rather than something I could work around in Python?= =0A=0AMany thanks again for any help.=0A=0AKim=0A=0A=0A____________________= ____________=0A From: Ben Finney =0ATo: python-= list@python.org =0ASent: Thursday, April 10, 2014 12:54 AM=0ASubject: Re: P= lotting the integer-and-fraction remainder of a function value modulo 360= =0A =0A=0AKim Plofker writes:=0A=0A> How can I get = Python to represent a value of a function in degrees,=0A> i.e., with values= between 0 and 360, by taking the (non-integer)=0A> function expression mod= 360?=0A=0AIn Python, you simply use the modulo (=E2=80=98%=E2=80=99) opera= tor::=0A=0A=C2=A0 =C2=A0 >>> 45.0 % 360=0A=C2=A0 =C2=A0 45.0=0A=C2=A0 =C2= =A0 >>> 700.0 % 360=0A=C2=A0 =C2=A0 340.0=0A=C2=A0 =C2=A0 >>> =0A=0A> That = is, I have a function with non-integer values, called Longitude=0A=0AIf the= y're not integers, and you're not saying what they *are*, then I=0Acan't kn= ow anything beyond =E2=80=9Cthey will behave the way the Longitude class=0A= defines them=E2=80=9D.=0A=0A> which is defined in terms of the variable t.= =0A=0AI don't understand what it means for a longitude value to be =E2=80= =9Cdefined in=0Aterms of the variable t=E2=80=9D.=0A=0ACan you say more abo= ut how these values are defined? Since (as you say)=0Athey're not integers,= what *are* they?=0A=0A> I just want to plot Longitude modulo 360 for a ran= ge of values of t:=0A> that is, for every value of t, plot the integer-AND-= fraction remainder=0A> after dividing Longitude by 360.=0A=0AWhat does it m= ean to =E2=80=9Cplot the integer-AND-fraction remainder=E2=80=9D? It=0Asoun= ds like you want to plot two numbers separately, the integer and the=0Afrac= tion remainder. But that doesn't make much sense to me.=0A=0ADo you mean si= mply that you want to plot numbers like =E2=80=983.7=E2=80=99, =E2=80=98270= .0=E2=80=99,=0Aand =E2=80=9848.75=E2=80=99? In which case, this is supporte= d by the native =E2=80=98float=E2=80=99=0Atype, and (for better accuracy) b= y the =E2=80=98decimal.Decimal=E2=80=99 type from the=0Astandard library::= =0A=0A=C2=A0 =C2=A0 >>> lon =3D decimal.Decimal("758.45")=0A=C2=A0 =C2=A0 >= >> lon % 360=0A=C2=A0 =C2=A0 Decimal('38.45')=0A=0A> But Python (in Sage) a= pparently won't let me use the int function or=0A> the // operator on funct= ions defined in terms of a variable: I get a=0A> "cannot evaluate symbolic = expression numerically" TypeError.=0A=0AIt sounds like this Sage is not beh= aving as the standard Python types=0Ado, with regard to the modulo =E2=80= =98%=E2=80=99 operator.=0A=0AFor help with Sage (I don't know what that is)= , you probably will get=0Abetter answers on a Sage-specific discussion foru= m.=0A=0AFrom the perspective of Python, the standard types handle the=0Areq= uirements you describe without any TypeError.=0A=0A-- =0A\=C2=A0 =C2=A0 =C2= =A0 =E2=80=9CIf you were going to shoot a mime, would you use a silencer?= =E2=80=9D |=0A=C2=A0 `\=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =E2=80=94Steven Wri= ght |=0A_o__)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 |=0ABen Finney=0A=0A-- =0Ahttps://mail.python.org/mail= man/listinfo/python-list --2164780-1011759679-1397106229=:8794 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Thanks, the % operator is indeed what I want, but = I want to use it with a function expression rather than with numbers alone.=  And that seems to create a type error.

Here's an example of what goes wrong:=

t =3D var('t')
L(t) =3D t*7= 25.5%360.0

This produces the following error message:

...=0ATypeError: unsupported operand type(s) for %:=0A'sage.symbolic.ex=
pression.Expression' and=0A'sage.symbolic.expression.Expression'

I can use other arithmetic op=
erators such as + and / in this function expression, but not %, and I don't=
 understand why.  Is it indeed a Sage-specific problem rather than som=
ething I could work around in Python?

Many thanks = again for any help.

Kim

From: Ben Finney <ben+python@ben= finney.id.au>
To: p= ython-list@python.org
Sent: Thursday, April 10, 2014 12:54 AM
Subject: Re: Plotting the integer-and-fraction remainder= of a function value modulo 360

Kim Plofker <kim_plofker@yahoo.com> writes:
=
> How can I get Python to represent a value of a function in degrees= ,
> i.e., with values between 0 and 360, by taking the (non-integer)<= br>> function expression mod 360?

In Python, you simply use the m= odulo (=E2=80=98%=E2=80=99) operator::

    >>> 45= .0 % 360
    45.0
    >>> 700.0 % 360    340.0
    >>>

> That is, I have a functio= n with non-integer values, called Longitude

If they're not integers,= and you're not saying what they *are*, then I
can't know anything beyon= d =E2=80=9Cthey will behave the way the Longitude class
defines them=E2= =80=9D.

> which is defined in terms of the variable t.

I d= on't understand what it means for a longitude value to be =E2=80=9Cdefined = in
terms of the variable t=E2=80=9D.

Can you say more about how t= hese values are defined? Since (as you say)
they're not integers, what *= are* they?

> I just want to plot Longitude modulo 360 for a range= of values of t:
> that is, for every value of t, plot the integer-AN= D-fraction remainder
> after dividing Longitude by 360.

What d= oes it mean to =E2=80=9Cplot the integer-AND-fraction remainder=E2=80=9D? I= t
sounds like you want to plot two numbers separately, the integer and t= he
fraction remainder. But that doesn't make much sense to me.

Do you mean simply that you wan= t to plot numbers like =E2=80=983.7=E2=80=99, =E2=80=98270.0=E2=80=99,
a= nd =E2=80=9848.75=E2=80=99? In which case, this is supported by the native = =E2=80=98float=E2=80=99
type, and (for better accuracy) by the =E2=80=98= decimal.Decimal=E2=80=99 type from the
standard library::

  =   >>> lon =3D decimal.Decimal("758.45")
    >= >> lon % 360
    Decimal('38.45')

> But Python= (in Sage) apparently won't let me use the int function or
> the // o= perator on functions defined in terms of a variable: I get a
> "canno= t evaluate symbolic expression numerically" TypeError.

It sounds lik= e this Sage is not behaving as the standard Python types
do, with regard= to the modulo =E2=80=98%=E2=80=99 operator.

For help with Sage (I d= on't know what that is), you probably will get
better answers on a Sage-= specific discussion forum.

From the perspective of Python, the standard types handle the
requirements you describe without any Typ= eError.

--
\      =E2=80=9CIf you were going to = shoot a mime, would you use a silencer?=E2=80=9D |
  `\   = ;                     &nb= sp;                     &= nbsp;     =E2=80=94Steven Wright |
_o__)      &= nbsp;                    =                     &nbs= p;                 |
Ben Finney<= br>
--
https://mail.python.org/mailman/listinfo/python-list<= /a>


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