Ask Your Question
1

remember and collect values/output

asked 2017-11-23 14:07:44 -0600

anonymous user

Anonymous

Hello, I am working with a function that involves random values. Thus, every time I run my code I get different values(in my case it is a set of values). When I get my output I want Sage to remember it and collect it every time I run my code. At the end I'd like to get a list of sets that has been accumulated every time I ran my code. Is there a way to do it?

I tried to research this topic and haven't found anything except saving a list to .txt file.

edit retag flag offensive close merge delete

Comments

One can set the seed, maybe, to make the results reconstructible. For instance:

sage: import random
sage: random.seed(20171123)
sage: for k in range( 3 ):
....:     print random.uniform(0,1)
....:     
0.797007996491
0.714119918018
0.683650988237
sage: random.seed(20171123)
sage: for k in range( 3 ):
....:     print random.uniform(0,1)
....:     
0.797007996491
0.714119918018
0.683650988237

Now to the question, let us use a list that records the random numbers in between...

sage: random.seed(20171123)
sage: random_values = []    # and we append
sage: for k in range( 3 ):
....:     z = random.uniform(0,1)
....:     random_values.append( z )
....:     # do stuff

giving the list of the three values...

dan_fulea gravatar imagedan_fulea ( 2017-11-23 14:25:42 -0600 )edit

Which is now the question more exactly?! The used data can be of course stored in the one or the other way...

dan_fulea gravatar imagedan_fulea ( 2017-11-23 14:26:35 -0600 )edit

@dan_fulea, i am not sure about the user's intentions, but it might be that the computation is long so that when she finds something interesting, she wants to store it, to not only to be able to recompute it. Keeping the seed when doing randomized experiments is a good idea in any case.

tmonteil gravatar imagetmonteil ( 2017-11-24 04:08:02 -0600 )edit

1 answer

Sort by ยป oldest newest most voted
2

answered 2017-11-24 03:59:06 -0600

tmonteil gravatar image

If you want to collect your sets into a list, you can start with the empty list, and append your sets to that list:

sage: L = []
sage: L.append({1,2,3})
sage: L.append({12,13})
sage: L
[{1, 2, 3}, {12, 13}]

At the end of the day, you can save that list on your disk:

sage: save(L,'/path/to/my_list.sobj')

The other day, you can load that list again:

sage: L = load('/path/to/my_list.sobj')
sage: L
[{1, 2, 3}, {12, 13}]

Then continue to append sets into it:

sage: L.append({123})
sage: L
[{1, 2, 3}, {12, 13}, {123}]

Then sage it again (on the same or a different file if you want to keep the history):

sage: save(L,'/path/to/my_list.sobj')

And so on.

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools

1 follower

Stats

Asked: 2017-11-23 14:07:44 -0600

Seen: 76 times

Last updated: Nov 24