Hi, everyone,
I want to create a sparse matrix, so I need to create a dict first. I
try to use `dict.fromkeys()` to do it, which like following:
```
sage: keys = [(0,1),(1,2)] # the length of keys maybe very long
sage: values = [0,1] # values have the same length as keys
sage: d = dict.fromkey
Hi, Dan, Thanks very much! It works very well. -- Huayi
On 2015年05月20日 09:39, Dan Drake wrote:
On Wed, 20 May 2015 at 06:27AM +0800, Huayi Wei wrote:
Hi, everyone,
I want to create a sparse matrix, so I need to create a dict first.
I try to use `dict.fromkeys()` to do it, which like following
Hi, everyone,
I have a sage matrix, and I want to get its left-lower and right-upper
triangular parts. Does there exist any method to get them directly?
In matlab, there are two functions `triu` and `tril` to do such things.
Does sage have the similar functions?
Best
Huayi
--
You receiv
efficient ways for sparse matrix, can you give me some
suggestion? Thanks very much.
Best
Huayi
On 2015年05月20日 14:26, Vincent Delecroix wrote:
Hi Huayi,
On 20/05/15 08:20, Huayi Wei wrote:
I have a sage matrix, and I want to get its left-lower and right-upper
triangular parts. Does there
Hi, there,
I met the following error when I install sage from ppa. My system is
Ubuntu 14.04 LTS 64bit.
I need your help. Thanks very much.
Best
Huayi
```
:~$ sudo apt-get install sagemath-upstream-binary
Reading package lists... Done
Building dependency tree
Reading state information... Don
th/+build/7362961/+files/sagemath-upstream-binary_6.6ppa1_amd64.deb>
sudo apt-mark hold sagemath-upstream-binary
And we can unhold the version-hold when we have a working PPA again.
Hopefully within a few days. Apologies for the inconvenience.
Regards,
Jan
On 1 June 2015 at 01:06, Huayi Wei &
