L- *:
rms has a nice tree, and fewer concepts are required.
Linda
-Original Message-
From: programming-boun...@forums.jsoftware.com
[mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Don Kelly
Sent: Monday, November 18, 2013 2:06 AM
To: programm...@jsoftware.com
Subje
In some ancient articles, they may tell you the average fo
sum of square is (+/%#)@*:
They are correct for some very old versions of J (at least for
the old J7 in 1993), becuase at that time rank of monad *: is _,
but later it was changed to rank 0.
Пн, 18 ноя 2013, Don Kelly писал(а):
> The pr
The problem is that
rms =: %:@(+/%#)@*:
doesn't work in this case but replacing @ with @: does work
(+/%#)@:*: 1 2 1 2
1 4 1 4
(+/%#)@:*: 1 2 1 2
2.5
it appears that (+/%#)@ 1 2 1 2 leads to 1 4 1 4 -the summation taken over
individual elements
(i.e (+/1%1),(+/4%1)... rather than acti
-++- %
>│L- #
>L- *:
>
> rms has a nice tree, and fewer concepts are required.
>
> Linda
>
>
> -Original Message-
> From: programming-boun...@forums.jsoftware.com
> [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Don K
Sent: Monday, November 18, 2013 2:06 AM
To: programm...@jsoftware.com
Subject: Re: [Jprogramming] Novice problem
You sent an answer to my question before I asked it! Thanks- I suspected
but didn't know that this was it.
I think that I will stay with the earlier definition:
rms=:[:%:[:(+/%
I do not expect a measurable speed difference in the rms
implementations I have seen here.
I could be wrong, of course.
Thanks,
--
Raul
On Mon, Nov 18, 2013 at 2:06 AM, Don Kelly wrote:
> You sent an answer to my question before I asked it! Thanks- I suspected
> but didn't know that this w
I always read/interpret "@" or "@:" as "of the"
Took me a while to get this "interpretation" but now I use it all the time
when I write J programs:
rms =: %:@(+/%#)@*: NB. square root "of the" mean "of the" squares.
On Mon, Nov 18, 2013 at 6:06 PM, Don Kelly wrote:
> You sent an answer to m
You sent an answer to my question before I asked it! Thanks- I
suspected but didn't know that this was it.
I think that I will stay with the earlier definition:
rms=:[:%:[:(+/%#)*:
which, while it does have brackets is somewhat more readable for my present
state of understanding. Yours is sho
Thanks - This is what I had concluded and Jasmin and Linda have also
emphasized the [: rather than @: Both, in this case do what I wanted.
Don
On 16/11/2013 9:43 PM, km wrote:
Focus on what you want to DO. You want to do "the square root of the mean of the
square".
A novice's tip for using
That is neat and does give me further material to think about.
I note that &. doesn't work (as I expected from the dictionary entry)
but &.: so I have to figure this out
Is it because that in u%.v y the u is applied to each element of y
and for &.: it is applied to the whole of y?
Don
On
scalJasmin/Advanced%20forks%20and%20grammar
- Original Message -
From: Don Kelly
To: "programm...@jsoftware.com"
Cc:
Sent: Saturday, November 16, 2013 8:20:04 PM
Subject: [Jprogramming] Novice problem
This is a novice problem (which arose from reading "Easy J" by Linda
Shorter version of root-mean-square using &.:
rms=.(+/%#)&.:*:
rms 1 2 1 2
1.58114
Den 16:23 søndag den 17. november 2013 skrev Raul Miller
:
Here's another definition of rms
>
> Rms=: +/@:*: %:@% #
> Rms 1 2 1 2
>1.58114
>
>Explanation:
>
>We do not need to square the numbers in
Here's another definition of rms
Rms=: +/@:*: %:@% #
Rms 1 2 1 2
1.58114
Explanation:
We do not need to square the numbers in the argument to #, we only
need to square them in the argument to +/
We only need the square root on the result of %
Makes sense?
Also, here's a partial explanat
Focus on what you want to DO. You want to do "the square root of the mean of
the square".
A novice's tip for using [: is to read [: f g as "the f of the g" . What you
want is
[: %: ( [: (+/%#) *: )
which you read as "the square root of ( the mean of the square )" . (Omitted
one "
: programm...@jsoftware.com
Subject: [Jprogramming] Novice problem
This is a novice problem (which arose from reading "Easy J" by Linda
Alvort I think that I have it worked out but this is something (IMHO) that
possibly should be in a primer.
I have occasion to use what is called rms or root
Here's how I think I'd do this:
RMS=: (+/ % #)&.:*:
RMS 1 2 1 2
1.58114
--
Raul
On Sat, Nov 16, 2013 at 8:20 PM, Don Kelly wrote:
> This is a novice problem (which arose from reading "Easy J" by Linda
> Alvort
> I think that I have it worked out but this is something (IMHO) that possi
%20grammar
- Original Message -
From: Don Kelly
To: "programm...@jsoftware.com"
Cc:
Sent: Saturday, November 16, 2013 8:20:04 PM
Subject: [Jprogramming] Novice problem
This is a novice problem (which arose from reading "Easy J" by Linda
Alvort
I think that I have it worked o
This is a novice problem (which arose from reading "Easy J" by Linda
Alvort
I think that I have it worked out but this is something (IMHO) that
possibly should be in a primer.
I have occasion to use what is called rms or root mean square (usually
applied to a wave form).
I can define root, me
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