[sage-support] Groebner bases error?

2008-03-03 Thread David Joyner
Hi: I'm wondering if the following possible error (in 2.10.3.rc0) is already known, or if I'm just doing something stupid: sage: R.a,b,c,d = PolynomialRing(QQ, 4) sage: I = ideal(b^2-a*c, c^2-b*d, a*d-b*c) sage: F = I.groebner_fan(); F Groebner fan of the ideal: Ideal (b^2 - a*c, c^2 - b*d,

[sage-support] Re: Groebner bases error?

2008-03-03 Thread Michael Abshoff
On Mon, Mar 3, 2008 at 12:18 PM, David Joyner [EMAIL PROTECTED] wrote: Hi David, Hi: I'm wondering if the following possible error (in 2.10.3.rc0) is already known, or if I'm just doing something stupid: it is already known, but not fixed as far as I know. There is no track ticket

[sage-support] VMware image to use IDE disk type

2008-03-03 Thread anatoly techtonik
Current 2.10.2 VMware image seems to have SCSI virtual disk type. This causes problems with other VM software, such as VirtualBox that supports only IDE images. As it doesn't really matter which drive type is used in VM, a little change in VMware images to use IDE allows to expose these images to

[sage-support] Re: VMware image to use IDE disk type

2008-03-03 Thread William Stein
On Mon, Mar 3, 2008 at 8:48 AM, anatoly techtonik [EMAIL PROTECTED] wrote: Current 2.10.2 VMware image seems to have SCSI virtual disk type. This causes problems with other VM software, such as VirtualBox that supports only IDE images. As it doesn't really matter which drive type is used

[sage-support] Re: sage installation Ubuntu 7.10 - extracting .tar error

2008-03-03 Thread William Stein
On Mon, Mar 3, 2008 at 1:01 PM, Chris S. [EMAIL PROTECTED] wrote: I am trying to install sage 2.10.2 on Ubuntu 7.10. I have tried both installation from a precompiled binary and from source. Each led to an error (below). I also tried installing sage 2.10.1 from source which had the same

[sage-support] Re: sage installation Ubuntu 7.10 - extracting .tar error

2008-03-03 Thread Carlo Hamalainen
On Mon, Mar 3, 2008 at 8:01 PM, Chris S. [EMAIL PROTECTED] wrote: gzip: stdin: invalid compressed data--crc error gzip: stdin: invalid compressed data--length error tar: Child returned status 1 tar: Error exit delayed from previous errors As William said, you didn't get the full file.

[sage-support] Re: Groebner bases error?

2008-03-03 Thread Marshall Hampton
Isn't this the same problem as 2358? Same source probably. -M.Hampton On Mar 3, 6:04 am, Michael Abshoff [EMAIL PROTECTED] wrote: On Mon, Mar 3, 2008 at 12:18 PM, David Joyner [EMAIL PROTECTED] wrote: Hi David, Hi: I'm wondering if the following possible error (in 2.10.3.rc0) is

[sage-support] Re: Groebner bases error?

2008-03-03 Thread [EMAIL PROTECTED]
On Mar 4, 1:12 am, Marshall Hampton [EMAIL PROTECTED] wrote: Isn't this the same problem as 2358? Same source probably. -M.Hampton Hi Marshall, it is either tightly related or the same issue. So far no one seems to have taken a serious stab at this [AFAIK]. Cheers, Michael

[sage-support] Re: Vector fields and Quivers

2008-03-03 Thread Jason Grout
Hector Villafuerte wrote: Hi, I would like to plot the gradient (i.e. vector field) of functions such as f(x,y) = exp(-(x^2 + y^2)); in this case: grad(f(x,y)) = vector([ -2*x*exp(-(x^2 + y^2)), -2*y*exp(-(x^2 + y^2)) ]) Initially I tried with plot_vector_field, but as of now it just