On Thursday, 23 May 2019 at 10:16:42 UTC, Alex wrote:
On Wednesday, 22 May 2019 at 08:25:58 UTC, Basile B. wrote:
On Wednesday, 22 May 2019 at 00:22:09 UTC, JS wrote:
I am trying to create some fast sin, sinc, and exponential
routines to speed up some code by using tables... but it
seems it's
On Thursday, 23 May 2019 at 15:25:31 UTC, Per Nordlöw wrote:
You mean wise versa, right?
Nevermind that comment. No "wise versa". You're answer is
correct, rikki cattermole.
Thanks
On Friday, 24 May 2019 at 08:33:34 UTC, Ola Fosheim Grøstad wrote:
So the LUT is 3-4 times faster even with your quarter-LUT
overhead.
4-5 times faster actually, since I made the LUT size known at
compiletime.
On Thursday, 23 May 2019 at 21:47:45 UTC, Alex wrote:
Either way, sin it's still twice as fast. Also, in the code the
sinTab version is missing the writeln so it would have been
faster.. so it is not being optimized out.
Well, when I run this modified version:
https://gist.github.com/run-dlan
On Friday, 24 May 2019 at 08:33:34 UTC, Ola Fosheim Grøstad wrote:
https://gist.github.com/run-dlang/9f29a83b7b6754da98993063029ef93c
I made an error here:
"return s*((1 - f)*QuarterSinTab[ai&511] +
f*QuarterSinTab[(ai+1)&511]);"
Should of course be:
return s*((1 - f)*QuarterSinTab[ai&511
Almost forgot...
I also redid the titles for all posts to clarify and group them
under various themes.
Today's blog post over on gtkDcoding.com is about using a GTK
dialog for saving a file. You can find it here:
http://gtkdcoding.com/2019/05/24/0038-file-save-dialog.html
On Friday, 24 May 2019 at 09:52:38 UTC, Ron Tarrant wrote:
Today's blog post over on gtkDcoding.com is about using a GTK
dialog for saving a file. You can find it here:
http://gtkdcoding.com/2019/05/24/0038-file-save-dialog.html
Interesting posts you have.
I might not be the first one to ask
Basically, I want this to fail:
auto notNull(T, Args...)(Args args) {
return NotNull!T(new T(args));
}
struct NotNull(T) {
private T _value;
@property ref inout(T) value() inout { return this._value; }
alias value this;
//disable opAssign to null as well
}
class C {}
void func(ref C
On Wednesday, 22 May 2019 at 00:22:09 UTC, JS wrote:
for(int i = 0; i < res; i++)
QuarterSinTab[i] = sin(PI*(i/cast(double)res));
Btw, I think this creates a half sine, not a quarter, so you want
(?):
QuarterSinTab[i] = sin(PI*(0.5*i/cast(double)res));
On Wednesday, 22 May 2019 at 12:59:13 UTC, greatsam4sure wrote:
I am having some difficulty installing DLS for dlang 1.16.4 the
visual studio code plugin for Dlang on my pc-windows 10 Lenovo
laptop ci7. it actually install in my ci3 running windows 10.
It says this app can't install on this pc.
On Friday, 24 May 2019 at 10:16:50 UTC, aliak wrote:
Basically, I want this to fail:
auto notNull(T, Args...)(Args args) {
return NotNull!T(new T(args));
}
struct NotNull(T) {
private T _value;
@property ref inout(T) value() inout { return this._value; }
alias value this;
//disable
On Friday, 24 May 2019 at 10:40:01 UTC, Simen Kjærås wrote:
NotNull n;
Typo. Should be NotNull!C n;
--
Simen
On Friday, 24 May 2019 at 10:09:06 UTC, Radu wrote:
Interesting posts you have.
Thanks.
I might not be the first one to ask for this, but including
some screen shots when talking about UI is usually a good idea.
You're right; you're not. :)
I'm still debating this idea, but I won't say I'm
On Friday, 24 May 2019 at 11:06:47 UTC, Ron Tarrant wrote:
I'm still debating this idea, but I won't say I'm adamantly
opposed to it. Research into how people learn seems to support
both sides of the argument: should imagery be included or not?
And I suppose if I ever pull all this stuff toge
On Friday, 24 May 2019 at 10:40:01 UTC, Simen Kjærås wrote:
On Friday, 24 May 2019 at 10:16:50 UTC, aliak wrote:
Basically, I want this to fail:
auto notNull(T, Args...)(Args args) {
return NotNull!T(new T(args));
}
struct NotNull(T) {
private T _value;
@property ref inout(T) value() i
On Friday, 24 May 2019 at 08:33:34 UTC, Ola Fosheim Grøstad wrote:
On Thursday, 23 May 2019 at 21:47:45 UTC, Alex wrote:
Either way, sin it's still twice as fast. Also, in the code
the sinTab version is missing the writeln so it would have
been faster.. so it is not being optimized out.
Well,
On Friday, 24 May 2019 at 08:13:00 UTC, Basilez B. wrote:
On Thursday, 23 May 2019 at 10:16:42 UTC, Alex wrote:
On Wednesday, 22 May 2019 at 08:25:58 UTC, Basile B. wrote:
On Wednesday, 22 May 2019 at 00:22:09 UTC, JS wrote:
I am trying to create some fast sin, sinc, and exponential
routines t
On Friday, 24 May 2019 at 11:40:20 UTC, aliak wrote:
It's ref so that you can do this for e.g.
class C { int i; }
auto a = notNull!C;
a.i = 3;
That's a valid concern for a struct, but classes are already
reference types, so you're only adding a new layer of ref-ness.
The above will work grea
On Wednesday, 22 May 2019 at 12:59:13 UTC, greatsam4sure wrote:
I am having some difficulty installing DLS for dlang 1.16.4 the
visual studio code plugin for Dlang on my pc-windows 10 Lenovo
laptop ci7. it actually install in my ci3 running windows 10.
It says this app can't install on this pc.
On Friday, 24 May 2019 at 11:45:46 UTC, Ola Fosheim Grøstad wrote:
On Friday, 24 May 2019 at 08:33:34 UTC, Ola Fosheim Grøstad
wrote:
On Thursday, 23 May 2019 at 21:47:45 UTC, Alex wrote:
Either way, sin it's still twice as fast. Also, in the code
the sinTab version is missing the writeln so it
On Friday, 24 May 2019 at 11:57:44 UTC, Alex wrote:
On Friday, 24 May 2019 at 08:13:00 UTC, Basilez B. wrote:
On Thursday, 23 May 2019 at 10:16:42 UTC, Alex wrote:
On Wednesday, 22 May 2019 at 08:25:58 UTC, Basile B. wrote:
On Wednesday, 22 May 2019 at 00:22:09 UTC, JS wrote:
I am trying to cr
On Friday, 24 May 2019 at 12:03:08 UTC, Simen Kjærås wrote:
On Friday, 24 May 2019 at 11:40:20 UTC, aliak wrote:
It's ref so that you can do this for e.g.
class C { int i; }
auto a = notNull!C;
a.i = 3;
That's a valid concern for a struct, but classes are already
reference types, so you're o
On Friday, 24 May 2019 at 12:01:55 UTC, Alex wrote:
Well, the QuarterWave was suppose to generate just a quarter
since that is all that is required for these functions due to
symmetry and periodicity. I started with a half to get that
working then figure out the sign flipping.
Sure, it is a t
On Friday, 24 May 2019 at 11:45:46 UTC, Ola Fosheim Grøstad wrote:
On Friday, 24 May 2019 at 08:33:34 UTC, Ola Fosheim Grøstad
wrote:
On Thursday, 23 May 2019 at 21:47:45 UTC, Alex wrote:
Either way, sin it's still twice as fast. Also, in the code
the sinTab version is missing the writeln so it
On Friday, 24 May 2019 at 12:24:02 UTC, Alex wrote:
So it seems like a quarter-wave LUT is 27 times faster than
sin…
If so then that is great and what I'd expected to achieve
originally.
I guess this is using LDC though? I wasn't able to compile with
LDC since after updating I'm getting l
On Friday, 24 May 2019 at 12:56:55 UTC, Ola Fosheim Grøstad wrote:
suggest above. Just beware that I haven't checked the code, so
it might be off by ±1 and such.
So before using such code for anything important, make sure that
it is tested for the edge cases, like denormal numbers (values
clo
On Friday, 24 May 2019 at 12:24:02 UTC, Alex wrote:
If it truly is a 27x faster then then that is very relevant and
knowing why is important.
Of course, a lot of that might simply be due to LDC and I
wasn't able to determine this.
Just one more thing you really ought to consider:
It isn't o
On Friday, 24 May 2019 at 11:45:46 UTC, Ola Fosheim Grøstad wrote:
const double sign =
cast(double)(-cast(uint)((mantissa>>63)&1));
Yep, this was wrong (0 or -1). Should be something like (1 or -1):
const double sign =
cast(double)(1-cast(uint)((mantissa>>62)&2));
You'll have to cod
On Friday, 24 May 2019 at 11:19:14 UTC, Radu wrote:
But there is also the marketing effect, these posts will be
more inviting for newcomers, especially ones coming from no D
experience. Might worth considering even for this reason as
your posts could be a powerful marketing tool for D.
Yup,
On Friday, 24 May 2019 at 12:03:37 UTC, Laurent Tréguier wrote:
On Wednesday, 22 May 2019 at 12:59:13 UTC, greatsam4sure wrote:
I am having some difficulty installing DLS for dlang 1.16.4
the visual studio code plugin for Dlang on my pc-windows 10
Lenovo laptop ci7. it actually install in my ci
This appears to get roughly the same results as sin(x):
__gshared double[512+1] QuarterSinTab;
void init(){
const auto res = QuarterSinTab.length-1;
for(int i = 0; i < res; i++)
QuarterSinTab[i] = sin(PI*(0.5*i/cast(double)res));
QuarterSinTab[$-1] = sin(PI*0.5);
}
With linear interpolation you get roughly the same result with
floats, a little more efficient too (half the memory and a bit
faster):
__gshared float[512+1] QuarterSinTab;
void init(){
const auto res = QuarterSinTab.length-1;
for(int i = 0; i < res; i++)
QuarterSinTab[i] = sin
On Friday, 24 May 2019 at 13:57:30 UTC, Ola Fosheim Grøstad wrote:
On Friday, 24 May 2019 at 12:24:02 UTC, Alex wrote:
If it truly is a 27x faster then then that is very relevant
and knowing why is important.
Of course, a lot of that might simply be due to LDC and I
wasn't able to determine t
On Friday, 24 May 2019 at 17:04:33 UTC, Alex wrote:
I'm not sure what the real precision of the build in functions
are but it shouldn't be hard to max out a double using standard
methods(even if slow, but irrelevant after the LUT has been
created).
LUTs are primarily useful when you use sin(x
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