Hi Gustavo,
oh YEAH - WHOW...what a *MACHINE* ! :) 8)
Thanks a lot!
Cheers
Meino
Gustavo Massaccesi [16-12-03 03:18]:
> I suggest to use the current-pseudo-random-generator, because otherwise the
> shuffle/seed will change globally the random sequence of all the program.
> For example:
>
>
Hi Jon,
That sounds excellent. Always preferable to find a better algorithm, and I
wasn't familiar with interval trees.
Thanks for the pointer.
Dave
On Fri, Dec 2, 2016 at 3:18 PM, Jon Zeppieri wrote:
> You could use an interval tree instead of a list. Before inserting into
> it, you could c
You could use an interval tree instead of a list. Before inserting into it,
you could check to see if your current chunk number is contiguous with an
existing interval in the tree. If so, merge the chunks and expand the
existing interval. Otherwise, insert an interval of size 1 into the tree.
Step
Thanks, Dan. Working with shifted lists is an interesting technique that
I'll keep in my quiver. I appreciate you taking the time.
On Fri, Dec 2, 2016 at 1:56 PM, Daniel Prager
wrote:
> Perhaps this is a more elegant approach to the tactical problem:
> simultaneously iterating over displaced v
Perhaps this is a more elegant approach to the tactical problem:
simultaneously iterating over displaced versions of the original list. E.g.
_x '(1 1 2 3 5 7 200 201 202) ; shifted right
x '(1 2 3 5 7 200 201 202 203) ; original list
x_ '(2 3 5 7 200 201 202 203 203) ; shifted left
When (=
I have a GUI program (located here, for reference:
https://github.com/lehitoskin/ivy.git ) I'm working on and I've found that the
time it takes to go from clicking on the binary (or calling from CLI) to
getting a fully loaded window takes about 2.5 ~ 3 seconds. What I would like is
to get it do
For the benefit of people on the Racket Users list, we're discussing the
Conjugate Gradient (CG) method applied to Least Squares problems, as
described in the original paper by Hestenes and Stiefel:
http://www.math.purdue.edu/~lucier/jresv49n6p409_A1b.pdf
The formulas to use are (10:2) on page
This is a more business-logic as opposed to syntax/technique question than
usually shows up on this list, but hopefully folks won't mind.
I started off to ask "what's the best way to find contiguous sequences of
numbers in a list?" and then realized that maybe I should answer the "What
are you try
I suggest to use the current-pseudo-random-generator, because otherwise the
shuffle/seed will change globally the random sequence of all the program.
For example:
;---
#lang racket
;; shuffle/seed : list? integer -> list?
(define (shuffle/seed lst seed)
(random-seed seed)
(shuffle lst))
(def
In case you get interested in implementing fitting for non-linear problems
as well, consider taking a look at this survey: "Methods for non-linear
least squares problems" by K. Madsen, H.B. Nielsen, O. Tingleff.
http://www2.imm.dtu.dk/pubdb/views/edoc_download.php/3215/pdf/imm3215.pdf
The first
Daniel Feltey [16-12-02 09:28]:
> I think something like this works:
>
> ;; shuffle/seed : list? integer -> list?
> (define (shuffle/seed lst seed)
> (random-seed seed)
> (shuffle lst))
>
> > (define a-list (list 1 2 3 4 5 6 7 8 9 10))
> > (shuffle/seed a-list 0)
> '(3 4 9 8 5 1 10 7 6 2)
>
I think something like this works:
;; shuffle/seed : list? integer -> list?
(define (shuffle/seed lst seed)
(random-seed seed)
(shuffle lst))
> (define a-list (list 1 2 3 4 5 6 7 8 9 10))
> (shuffle/seed a-list 0)
'(3 4 9 8 5 1 10 7 6 2)
> (shuffle/seed a-list 0)
'(3 4 9 8 5 1 10 7 6 2)
> (sh
On Thu, Dec 1, 2016 at 7:29 PM, David Storrs wrote:
> I'm having trouble understanding the docs on hash contracts (
> https://docs.racket-lang.org/reference/data-structure-
> contracts.html#%28def._%28%28lib._racket%2Fcontract%
> 2Fprivate%2Fhash..rkt%29._hash%2Fc%29%29)
>
> What I'm trying to ex
Hi,
is there a racket function, which shuffles a list of items
based on a seed value...that is: Same seed value results in
same shuffle results?
Cheers
Meino
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