On Wed, Mar 4, 2020 at 12:20 AM Fernando Gouvea wrote:
>
> But no, it doesn't work, since it gives a rectangular plot instead of one in
> polar coordinates. But maybe we are closer.
I looked at the labels on the axes, and they do match the ranges of r
and phi, so I don't udnerstand
how it's poss
But no, it doesn't work, since it gives a rectangular plot instead of
one in polar coordinates. But maybe we are closer.
I still think implicit_plot should be smarter about values that do not
make sense.
Fernando
On 3/3/2020 6:26 PM, Dima Pasechnik wrote:
even better:
sage: var('x y u v r
Nice idea. Thanks.
Fernando
On Tue, Mar 3, 2020 at 6:27 PM Dima Pasechnik wrote:
> even better:
>
> sage: var('x y u v r phi')
> : u=r*cos(phi)
> : v=r*sin(phi)
> : x=u*sqrt(9/(1-r^2))
> : y=v*sqrt(9/(1-r^2))
> : implicit_plot(y^2-x^3+x==0,(r,0,999/1000),(phi,-pi,pi))
>
> On
even better:
sage: var('x y u v r phi')
: u=r*cos(phi)
: v=r*sin(phi)
: x=u*sqrt(9/(1-r^2))
: y=v*sqrt(9/(1-r^2))
: implicit_plot(y^2-x^3+x==0,(r,0,999/1000),(phi,-pi,pi))
On Tue, Mar 3, 2020 at 10:28 PM Dima Pasechnik wrote:
>
> On Tue, Mar 3, 2020 at 10:10 PM Fernando Gouve
On Tue, Mar 3, 2020 at 10:10 PM Fernando Gouvea wrote:
>
> The whole point of this is to show the behavior of the curve near infinity,
> so changing the limits is not an option.
just paste together a number of rectangles where (u,v) stay inside the
unit circle.
(yes, this would need writing a lo
A caveat is that at the boundary, the mapping you describe becomes
non differentiable (the determinant of the differential blows up to
infinity),
so it's going to be painful for implicit_plot to work.
That being said, the following tweak runs ok but it's not ex
The whole point of this is to show the behavior of the curve near
infinity, so changing the limits is not an option.
Fernando
On 3/3/2020 4:15 PM, Dima Pasechnik wrote:
On Tue, Mar 3, 2020 at 8:20 PM Fernando Gouvea wrote:
Here's what I ended up trying, with r=3:
var('x y u v')
x=u*sqrt(9/(
On Tue, Mar 3, 2020 at 9:15 PM Dima Pasechnik wrote:
>
> On Tue, Mar 3, 2020 at 8:20 PM Fernando Gouvea wrote:
> >
> > Here's what I ended up trying, with r=3:
> >
> > var('x y u v')
> > x=u*sqrt(9/(1-u^2-v^2))
> > y=v*sqrt(9/(1-u^2-v^2))
> > implicit_plot(y^2-x^3+x==0,(u,-1,1),(v,-1,1))
> >
> >
On Tue, Mar 3, 2020 at 8:20 PM Fernando Gouvea wrote:
>
> Here's what I ended up trying, with r=3:
>
> var('x y u v')
> x=u*sqrt(9/(1-u^2-v^2))
> y=v*sqrt(9/(1-u^2-v^2))
> implicit_plot(y^2-x^3+x==0,(u,-1,1),(v,-1,1))
>
> That gives an error:
>
> /opt/sagemath-8.9/local/lib/python2.7/site-packages
Here's what I ended up trying, with r=3:
var('x y u v')
x=u*sqrt(9/(1-u^2-v^2))
y=v*sqrt(9/(1-u^2-v^2))
implicit_plot(y^2-x^3+x==0,(u,-1,1),(v,-1,1))
That gives an error:
/opt/sagemath-8.9/local/lib/python2.7/site-packages/sage/ext/interpreters/wrapper_rdf.pyx insage.ext.interpreters.wrapper_r
It worked.
I just removed everything and downloaded and built it again, following to
the steps in your first reply.
Thanks a lot :)
On Tuesday, 3 March 2020 22:11:36 UTC+5:30, Dima Pasechnik wrote:
>
> anyhow, Sage needs R version 3.4.4 or later,
> so this is provided by Ubuntu's r-base-dev pack
anyhow, Sage needs R version 3.4.4 or later,
so this is provided by Ubuntu's r-base-dev package.
Did you try it?
(Unless you must use a newer R for some reason...)
On Tue, Mar 3, 2020 at 2:55 PM K2 wrote:
>
> Hi,
> Thanks for the quick help.
> I have experimented with installing several versions
what exactly are these versions of R packages? (with urls) One needs
development packages, ones that come with headers.
Please post config.log
as well
On Tue, 3 Mar 2020, 14:55 K2, wrote:
> Hi,
> Thanks for the quick help.
> I have experimented with installing several versions of R :
> 3.6.2-
Hi,
Thanks for the quick help.
I have experimented with installing several versions of R :
3.6.2-1bionic
3.6.3-1bionic
But None of them are recognized, and the configure still says:
*r-3.6.2.p0: no suitable system package;
will be installed as an SPKG*
On T
This is a known problem.
One way to work around it is to install R and related packages from the system.
We recommend that you do
$ sudo apt-get install bc binutils bzip2 cliquer curl g++ g++ gcc gcc
gfan gfortran git gmp-ecm lcalc libboost-dev libbz2-dev libcliquer-dev
libcurl4-openssl-dev libec-
Am not able to build sage from the source code on my xubuntu.
I am getting an error in build of r-3.6.2.p0
I have attached the log files below
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