Am Sun, 22 Dec 2013 02:12:51 +0100
schrieb Timon Gehr timon.g...@gmx.ch:
On 12/22/2013 02:09 AM, Timon Gehr wrote:
The morale is that uniform random numbers doesn't imply that
every value in the range will eventually be generated once!
Yes it does. (The probability that some value is
On Sunday, 22 December 2013 at 08:06:30 UTC, Marco Leise wrote:
Can you elaborate a bit? How do you know that the Java LCG
can produce every 32-bit integer once? If that's true then
the problem with the Java code was something different and I
was just biased, because I was already expecting the
On 12/22/2013 09:06 AM, Marco Leise wrote:
Am Sun, 22 Dec 2013 02:12:51 +0100
schrieb Timon Gehr timon.g...@gmx.ch:
On 12/22/2013 02:09 AM, Timon Gehr wrote:
The morale is that uniform random numbers doesn't imply that
every value in the range will eventually be generated once!
Yes it
Am Sun, 22 Dec 2013 09:19:48 +
schrieb Chris Cain clc...@uncg.edu:
On Sunday, 22 December 2013 at 08:06:30 UTC, Marco Leise wrote:
Can you elaborate a bit? How do you know that the Java LCG
can produce every 32-bit integer once? If that's true then
the problem with the Java code was
On Saturday, 21 December 2013 at 05:12:57 UTC, Chris Cain wrote:
For more information, I've written a document on an
implementation of uniform (which should be coming in 2.065,
btw) which discusses the issue with just using the modulus
operator:
Chris Cain:
https://dl.dropboxusercontent.com/u/2206555/uniformUpgrade.pdf
From page 6:
size_t[] counts = new size_t[](top);
foreach(i; 0 .. 500_000_000)
counts[uniform(0, top)] += 1;
Modern D allows you to write better code:
size_t[N] counts;
foreach (immutable _; 0 .. 500_000_000)
On Saturday, 21 December 2013 at 15:03:34 UTC, bearophile wrote:
Chris Cain:
https://dl.dropboxusercontent.com/u/2206555/uniformUpgrade.pdf
From page 6:
size_t[] counts = new size_t[](top);
foreach(i; 0 .. 500_000_000)
counts[uniform(0, top)] += 1;
Modern D allows you to write better
Meta:
I know immutable is a good thing, but don't you think
`immutable _` is a bit unnecessary in this case?
Some answer, choose the one you prefer:
1) Yes, it's totally useless because the _ variable is not even
used inside the loop body! So sorry, I'm always so pedantic.
2) It's
Am Fri, 20 Dec 2013 15:53:08 +0100
schrieb marcpmichel marc.p.mic...@gmail.com:
I participated in the global day of code retreat 2013, and we
had to do refactoring on a very ugly piece of code which was
available on many languages.
But there was no D version, so I made one (based on the
On 12/22/2013 01:07 AM, Marco Leise wrote:
...
It didn't cause issues for any of the other students, but on
this particular computer the random seed that the Random ctor
chose caused a degenerate case where it never hit any of the 3
remaining indexes of the list.
The morale is that uniform
On 12/22/2013 02:09 AM, Timon Gehr wrote:
The morale is that uniform random numbers doesn't imply that
every value in the range will eventually be generated once!
Yes it does. (The probability that some value is never generated is 0.)
The actual morale is that random number generators do not
On Saturday, 21 December 2013 at 20:43:27 UTC, bearophile wrote:
3) Just like the integer '5' a range of values as 0 .. 1000 is
an immutable value. So a variable that scans such range should
be immutable. If you really want to mutate such variable you
should add a modifier like mutable or mut
marcpmichel:
Here is the ugly thing :
https://github.com/jbrains/trivia/tree/master/d
And wrong:
if (rand.front() % 9 == 7) {
Bye,
bearophile
On Friday, 20 December 2013 at 15:05:07 UTC, bearophile wrote:
marcpmichel:
Here is the ugly thing :
https://github.com/jbrains/trivia/tree/master/d
And wrong:
if (rand.front() % 9 == 7) {
Bye,
bearophile
Do you mean I should have used :
if (uniform(0,10) == 7) {
instead ?
marcpmichel:
Do you mean I should have used :
if (uniform(0,10) == 7) {
instead ?
Right. Using % introduces a bias.
Bye,
bearophile
On Friday, 20 December 2013 at 16:20:44 UTC, marcpmichel wrote:
On Friday, 20 December 2013 at 15:05:07 UTC, bearophile wrote:
marcpmichel:
Here is the ugly thing :
https://github.com/jbrains/trivia/tree/master/d
And wrong:
if (rand.front() % 9 == 7) {
Bye,
bearophile
Do you mean I
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