On Wednesday, 15 June 2016 at 02:43:37 UTC, data pulverizer wrote:
How do I unravel a sliced item T[].sliced(...) to an array T[]?
For instance:
import std.experimental.ndslice;
auto slice = new int[12].sliced(3, 4);
int[] x = ??;
Thanks
A slice is just a _view_ on your memory, the easiest w
On Wednesday, 15 June 2016 at 02:50:30 UTC, Seb wrote:
On Wednesday, 15 June 2016 at 02:43:37 UTC, data pulverizer
wrote:
How do I unravel a sliced item T[].sliced(...) to an array T[]?
For instance:
import std.experimental.ndslice;
auto slice = new int[12].sliced(3, 4);
int[] x = ??;
Thanks
On Wednesday, 15 June 2016 at 03:11:23 UTC, data pulverizer wrote:
in that case:
import std.array : array;
int[] x = slice.byElement.array;
Are you sure you want to create a _copy_ of your data? In most
cases you don't need that ;-)
thanks, now I can go to bed!
You are welcome. Sleep tig
On Wednesday, 15 June 2016 at 03:17:39 UTC, Seb wrote:
On Wednesday, 15 June 2016 at 03:11:23 UTC, data pulverizer
wrote:
in that case:
import std.array : array;
int[] x = slice.byElement.array;
Are you sure you want to create a _copy_ of your data? In most
cases you don't need that ;-)
t
On Wednesday, 15 June 2016 at 07:24:23 UTC, data pulverizer wrote:
On Wednesday, 15 June 2016 at 03:17:39 UTC, Seb wrote:
On Wednesday, 15 June 2016 at 03:11:23 UTC, data pulverizer
wrote:
in that case:
import std.array : array;
int[] x = slice.byElement.array;
Are you sure you want to creat
On Wednesday, 15 June 2016 at 07:45:12 UTC, Andrea Fontana wrote:
On Wednesday, 15 June 2016 at 07:24:23 UTC, data pulverizer
wrote:
On Wednesday, 15 June 2016 at 03:17:39 UTC, Seb wrote:
On Wednesday, 15 June 2016 at 03:11:23 UTC, data pulverizer
wrote:
in that case:
import std.array : array
On Wednesday, 15 June 2016 at 08:25:35 UTC, data pulverizer wrote:
I guess foreach would not copy the elements? for example:
foreach(el; slice.byElement)
x ~= el;
But it feels wrong to be doing work pulling elements that
already exists by using foreach. I feel as if I am missin
On Wednesday, 15 June 2016 at 08:53:22 UTC, Andrea Fontana wrote:
On Wednesday, 15 June 2016 at 08:25:35 UTC, data pulverizer
wrote:
I guess foreach would not copy the elements? for example:
foreach(el; slice.byElement)
x ~= el;
But it feels wrong to be doing work pulling eleme
On Wednesday, 15 June 2016 at 08:56:15 UTC, data pulverizer wrote:
On Wednesday, 15 June 2016 at 08:53:22 UTC, Andrea Fontana
wrote:
On Wednesday, 15 June 2016 at 08:25:35 UTC, data pulverizer
wrote:
I guess foreach would not copy the elements? for example:
foreach(el; slice.byElement)
On Wednesday, 15 June 2016 at 09:32:21 UTC, Andrea Fontana wrote:
Then I think the slice.byElement.array is the right solution.
The problem with that is that it slows down the code. I compared
matrix multiplication between R and D's cblas adaptor and ndslice.
n = 4000
Matrices: A, B
Sizes: b
On Wednesday, 15 June 2016 at 11:19:20 UTC, data pulverizer wrote:
On Wednesday, 15 June 2016 at 09:32:21 UTC, Andrea Fontana
wrote:
Then I think the slice.byElement.array is the right solution.
The problem with that is that it slows down the code. I
compared matrix multiplication between R a
On Wednesday, 15 June 2016 at 12:10:32 UTC, Seb wrote:
As said you can avoid the copy (see below). I also profiled it
a bit and it was interesting to see that 50% of the runtime are
spent on generating the random matrix. On my machine now both
scripts take 1.5s when compiled with
I didn't ben
Oh, I didn't see that runif now returns a tuple.
On Wednesday, 15 June 2016 at 13:13:05 UTC, data pulverizer wrote:
On Wednesday, 15 June 2016 at 12:10:32 UTC, Seb wrote:
As said you can avoid the copy (see below). I also profiled it
a bit and it was interesting to see that 50% of the runtime
are spent on generating the random matrix. On my m
On Wednesday, 15 June 2016 at 14:14:23 UTC, Seb wrote:
On Wednesday, 15 June 2016 at 13:13:05 UTC, data pulverizer
And where can I find more cool tricks like that?
Browse the source code and the unittests. Phobos is an amazing
resource :)
Very true!
That's great many thanks!
On Wednesday, 15 June 2016 at 14:14:23 UTC, Seb wrote:
```
T[] a = slice.ptr[0.. slice.elementsCount];
```
This would work only for slices with continuous memory
representation and positive strides. -- Ilya
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