Dianbin Bao's profile - activity

Thank you so much. It saves my day!!!!!!

Hi all,

I am using Sage on my mac terminal. The mac keyboard does not have home or end key. I check out several combinations and they does not work in Sage terminal platform, but works on Rstudio. How do I recover the home and end key?

Thanks.

Hi all,

I would like to draw a random graph by Sage. The general stochastic model is the following: The graph contains $n$ vertices and the n vertices are divided into $r$ communities $C_1\cdots,C_r$. For two vertices within the same community, there is a probability $P_r$ that they are connected directly by an edge. How do I plot such a graph in Sage? References appreciated.

Hi

suppose I have a real number x in decimal digits, how do I find an approximate polynomial f(x) \in ZZ[x] with x a root?

Hi

I would like to compute Petersson Inner product of two Hecke eigenforms by Sage. What command can Sage do that?

Thanks very much, T,monteil. You save me the day!

Hi,

Suppose for example E =[x,x^2,x+1] is a list of elements in ZZ[x]. Let K be a number field defined in Sage

K.<a> = NumberField(f(x))

for some irreducible polynomial $f(x)$. Then how can one evaluate the list E by setting $x=a$ and $x=\sigma(a)$ (conjugate of a) in Sage?

To people who has similar problems: One can unravel multidimensional list to one dimensional list and then input Sage.

This is exactly what I want. Thank you very much, Tmonteil!

Hi,

Let f(x) be an irreducible polynomial over $ZZ[x]$. We can define a number field

K.<a>= NumberField(f(x))

My question is how does one define all the embedding of K into the real or complex in Sage?

Hi all,

I would like to write the output of a for loop in Pari to a file named 'foo', However the output of a for loop has no numbering contrast with other output. If I look at the numbers labeling the outputs before and after the for loop and use that number in the following command

\w n foo

Then what I get in foo is 0. What happened and how can this be fixed?

Hi all,

I would like to do number field arithmetic in Pari. To be more precise, I would like let Pari do the following job as Sage does,

K.<a> = NumberField(f(x))
L.<b> = NumberField(g(x))

where f(x), g(x) are irreducible polynomials over the rational. I would like to do arithmetic with a,b. This is easily done in Sage. How can I do this by Pari?

Thanks

Hi all,

I would like to define a big matrix E (130$\times$ 30) with entries being a list like E[11,1] = [x, [1,-2]];

E[14,1] = [x, [1,-1,-2,1]]; or 0. These entries are stored in a separate file which is readable by Pari but not Sage.

How do I define it by Sage?

This happens for Sage installed on my laptop and also that installed on my university's server. I type %gp in Sage to run Pari, but I can not exit using the usual command \q, I tried quit, then it reports PARI/GP interpreter crashed -- automatically restarting again and again.

Hi all,

I am doing computation with a Pari readable table. Since I am a beginner to Pari, I would like to know that after defining a number field for example $K=nfinit(x^2-76)$, how do I play around with the generator $x$? This is super easy in Sage and may be silly question for people familiar with Pari. It also solve my problem if you know how to save a big matrix defined in Pari to an object readable by Sage.

Dear vdelecroix,

I am doing computation with Stein's tables at [http://wstein.org/Tables/an.html], William Stein says it is readable by Pari. However when I failed to load it by the Pari kernel installed in Sage. But it is OK now once I installed Pari on my laptop and load the database there. The bug may be due to the fact that Pari is not embedded in Sage perfectly.

Hi all, I meet the following problem when exiting pari:

It reports that PARI/GP interpreter crashed -- automatically restarting.

I clicked control+C for a couple times, it can exit but no if I do nothing. Is this a bug? Sage is installed on a ubuntu system.