maxima broken in notebook on sagenb?

[Dana Ernst]

I was attempting to convince my calculus students this morning in class to play with Sage when doing their homework instead of using Wolfram|Alpha all the time. However, this failed miserably because maxima wasn't working on sagenb.org (at least it wasn't around 10:30 AM EST and it still isn't working as I type this email). When I entered stuff like

integral(x*e^(-x),x)

I got an error message about maxima:

Traceback (click to the left of this block for traceback)
...
TypeError: Unable to start maxima because the command 'maxima-noreadline
--userdir="/tmp/sagenbws/maxima" -p
"/usr/local/sage2/local/bin/sage-maxima.lisp"' failed.
Is this a problem on my end or is something up with sagenb.org?

Thanks.

Dana Ernst, Ph.D.
Assistant Professor
Department of Mathematics
Plymouth State University
MSC 29, 17 High Street
Plymouth, NH 03264-1595

Email: dce...@plymouth.edu
Web Page: http://oz.plymouth.edu/~dcernst
Office: Hyde 312

[Thomas Scofield]

Could this also be the source of my problem?  Code like

var('x y z t') p1 = parametric_plot3d((x,0,z), (x,-1.2,1.2), (z,-1.2,1.2), color='green', opacity=.65) p2 = parametric_plot3d((x,2-x,z), (x,-1.2,1.2), (z,-1.2,1.2), color='green', opacity=.65) p3 = parametric_plot3d((sin(t), y, cos(t)), (t,0,2*pi), (y,-0.5,3), color='blue', opacity=.65) show(p1+p2+p3)

resulted in nothing at all, when before I've received a nice 3D plot.  One student told me this am he has been experiencing this kind of behavior back into the weekend.  We (my students and I) are all working off of sagenb.org.

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Thomas L. Scofield

--------------------------------------------------------

Associate Professor

Department of Mathematics and Statistics

Calvin College

--------------------------------------------------------

[William Stein]

On Mon, Mar 1, 2010 at 8:36 AM, Thomas Scofield <scof...@calvin.edu> wrote:
>
> Could this also be the source of my problem?  Code like
> var('x y z t') p1 = parametric_plot3d((x,0,z), (x,-1.2,1.2), (z,-1.2,1.2),
> color='green', opacity=.65) p2 = parametric_plot3d((x,2-x,z), (x,-1.2,1.2),
> (z,-1.2,1.2), color='green', opacity=.65) p3 = parametric_plot3d((sin(t), y,
> cos(t)), (t,0,2*pi), (y,-0.5,3), color='blue', opacity=.65) show(p1+p2+p3)
> resulted in nothing at all, when before I've received a nice 3D plot.  One
> student told me this am he has been experiencing this kind of behavior back
> into the weekend.  We (my students and I) are all working off of sagenb.org.
>
> On Mar 1, 2010, at 11:29 AM, Dana Ernst wrote:
>
> I was attempting to convince my calculus students this morning in class to
> play with Sage when doing their homework instead of using Wolfram|Alpha all
> the time.  However, this failed miserably because maxima wasn't working on
> sagenb.org (at least it wasn't around 10:30 AM EST and it still isn't
> working as I type this email).  When I entered stuff like
>
> integral(x*e^(-x),x)
>
> I got an error message about maxima:
>
> Traceback (click to the left of this block for traceback)
> ...
> TypeError: Unable to start maxima because the command 'maxima-noreadline
> --userdir="/tmp/sagenbws/maxima" -p
> "/usr/local/sage2/local/bin/sage-maxima.lisp"' failed.
> Is this a problem on my end or is something up with sagenb.org?
>
> Thanks.
>

It's with sagenb. Somebody again "fork bombed" sagenbws. I've killed
all processes, and I'll raise the process limit somewhat (maybe 200 is
too restrictive).

William