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Re: Is this list still active?
From: |
Macy |
Subject: |
Re: Is this list still active? |
Date: |
Wed, 2 Oct 2013 16:14:29 -0700 |
--- address@hidden wrote:
From: "c." <address@hidden>
To: Macy <address@hidden>
Cc: <address@hidden>
Subject: Re: Is this list still active?
Date: Wed, 2 Oct 2013 19:25:51 +0200
On 2 Oct 2013, at 19:06, Macy <address@hidden> wrote:
> Carlo,
>
> Thank you for the URL.
>
> I received a copy from the group's system, so assumed it also went to
> everybody.
>
> Perhaps, too easy a question?
>
This is the latest message from you I can see on the list:
https://mailman.cae.wisc.edu/pipermail/help-octave/2013-September/060552.html
Is that the question you refer to?
It seems that message did receive an answer though ...
c.
= = = = =
Am I supposed to be bottom posting, too?
I don't think that was the last one. However, I did get great suggestions for
that one that resulted in a 100 to 1 speed increase!
After vectorizing the loop, I then checked it for accuracy it is THAT question
I heard nothing from.
The message [which I don't have copy of] compares the for i=1:?? loop's
accuracy to the vectorized loop's accuracy [I always do these sanity checks]
Usually when I plot sigA-sigB I get a zero line, but in this case I got a very
interesting random error plot, obviously caused by computer truncation
accuracies. I expected some error, but what I got starts small, then 'step'
increases, then 'step' increases again, and so on. The original error is on
the order of 1e-7 and the 'error on the error' is around 1e-7, which means YES
1e-15 is the truncation accuracy in the machin, but what amazed me was the step
step step of that error.
I may still have the program - I did a stand alone script of both techniques,
followed by a plot of the difference of the two techniques, hoping someone
would try the script and tell me what their machine did.
I hope it doesn't get kicked out for being long message. Will look for it.
Essentially it is a comparison between using a for loop versus the vectorized
approach to find the effect of clock jitter on a signal
then the two results are subtracted [SHOULD BE ZERO], but are not.