I don't know, your "(res+V×0)" is probably the way to go for that purpose, I'm
not an expert but I understand what you mean.
I have an alias defined as:
proto←{↑0⍴⊂ ⍵}
that give me the prototype of the argument (use with: 24 QuadCR proto w). It
will probably not help you but good to know.
Xtian.
On 2017-06-30 00:24, Elias Mårtenson wrote:
The purpose of it is to preserve the structure of the argument, while setting
all values to MAXINT.
Is there a better way to achieve this?
Regards,
Elias
On 30 June 2017 at 12:21, Christian Robert <christian.rob...@polymtl.ca
<mailto:christian.rob...@polymtl.ca>> wrote:
On 2017-06-30 00:19, Elias Mårtenson wrote:
Thanks. I'll stick with this for now then.
How would (res+V×0) wrap around, by the way?
Bad first reading, (res+V×0) does nothing, it add 0 to "res". How is it
usefull ?
Xtian.
On 30 June 2017 at 12:17, Christian Robert <christian.rob...@polymtl.ca
<mailto:christian.rob...@polymtl.ca> <mailto:christian.rob...@polymtl.ca
<mailto:christian.rob...@polymtl.ca>>> wrote:
I think this is the best you can get, about 62 bits of randomness.
(64⍴2) ⊤⎕syl[20;2] ⍝ the largest 64 bits integer supported
by gnu-apl
0 1 1 1 1 1 1 1 1 0 1 0 1 1 0 0 1 1 1 1 0 1 1 1 0 1 0 0 0 0 0 1 1
0 0 1 1 1 0 1 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
so, it's a bit less than 63 bits, say 62 bits for safety is Ok.
Note that (res+V×0) may wrap around.
Xtian.
On 2017-06-29 23:23, Elias Mårtenson wrote:
I had a need to have a function that does the same as monadic
?, but with the difference that the resulting numbers not be integers, but
floating point.
Now, here's my attempt at creating such a function, I'd like
to know if this is the best way to achieve what I need:
∇ r←*hrRand* V ;res
⍝⍝ Like monadic ?, but returns floating point numbers
res ← ⎕SYL[19+⎕IO;1+⎕IO]
r ← V × res÷⍨ ?res+V×0
∇
Example:
* hrRand 3 2 ⍴ 10 100 5 (3 4 (2 2⍴5)) 1000*
┏→━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
↓ 4.138685128 <tel:4.138685128> <tel:4.138685128
<tel:4.138685128>> 54.55782413 ┃
┃ 0.4543486424
┏→━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓┃
┃ ┃2.024528001 <tel:2.024528001>
<tel:2.024528001 <tel:2.024528001>> 2.772781338 ┏→━━━━━━━━━━━━━━━━━━━━━━┓┃┃
┃ ┃ ↓3.185551114
<tel:3.185551114> <tel:3.185551114 <tel:3.185551114>> 3.13571477 ┃┃┃
┃ ┃ ┃1.204617876 4
<tel:1.204617876%204> <tel:204617876%204>.396324338┃┃┃
┃ ┃
┗━━━━━━━━━━━━━━━━━━━━━━━┛┃┃
┃
┗∊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛┃
┃634.0902523
9.353801479┃
┗∊∊━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
Regards,
Elias
