| Re: moving average of a large array [message #51442] |
Mon, 27 November 2006 09:21  |
![Paul Van Delst[1] is currently offline](theme/default/images/xoffline.png.pagespeed.ic.XRkd1fkXye.png "Paul Van Delst[1] is currently offline")
Paul Van Delst[1]
Messages: 1157
Registered: April 2002
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Senior Member |
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David Fanning wrote:
> Jenny writes:
>
>> Thanks for your kind reminder! I see they are not the same. What I
>> really want is a 5 or 7 point moving average of the 3rd dimension of my
>> array. Why couldn't they add the convenient arguments/keywords to
>> TS_SMOOTH?!
>
> Maybe they will when you ask you ask them nicely. :-)
>
> Most programs are written with a particular purpose in
> mind. But anyone who has shared programs with the world
> quickly comes to realize that either (A) people can't
> read the documentation, or (B) people could care less
> about the documentation and want to use the program for
> their own purposes anyway. It's an eye-opening experience.
>
> Over time you get a little better at anticipating how
> people are going to use/abuse your programs and you make
> allowances for that in your coding. But only a savant could
> see all the possibilities. :-)
Or you could label your code as opiniated software. See:
http://tinyurl.com/7ojc8
A small quote:
<quote>
Rails is opinionated software. It eschews placing the old ideals of software in a primary
position. One of those ideals is flexibility�the notion that we should try to accommodate
as many approaches as possible, that we shouldn't pass judgement on one form of
development over another.
</quote>
cheers,
paulv
--
Paul van Delst Ride lots.
CIMSS @ NOAA/NCEP/EMC Eddy Merckx
Ph: (301)763-8000 x7748
Fax:(301)763-8545
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| Re: moving average of a large array [message #51474 is a reply to message #51473] |
Fri, 24 November 2006 08:17  |
envi35@yahoo.ca
Messages: 48
Registered: March 2005
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Member |
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Hi David,
Thanks for your kind reminder! I see they are not the same. What I
really want is a 5 or 7 point moving average of the 3rd dimension of my
array. Why couldn't they add the convenient arguments/keywords to
TS_SMOOTH?!
Good day,
Jenny
David Fanning wrote:
> Jenny writes:
>
>> Hi, thanks for you reply. I must have been blinded not seeing SMOOTH
>> can be used instead of TS_SMOOTH for multi-dimension array!!
>
> Well, I think you might want to be a bit careful here,
> as the "smoothing" carried out by TS_SMOOTH is not the
> same as the "smoothing" implemented by SMOOTH, I think.
> Just be sure you know what you are doing. :-)
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: moving average of a large array [message #51487 is a reply to message #51485] |
Fri, 24 November 2006 06:46 |
envi35@yahoo.ca
Messages: 48
Registered: March 2005
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Member |
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Hi, thanks for you reply. I must have been blinded not seeing SMOOTH
can be used instead of TS_SMOOTH for multi-dimension array!!
Jenny
Kenneth P. Bowman wrote:
> In article <1164296828.559622.31580@m7g2000cwm.googlegroups.com>,
> "Jenny" <envi35@yahoo.ca> wrote:
>
>> Hi, I want to calculate the moving average of a large array:
>> data[800,800,365]. The moving average is for the 3rd dimension - day of
>> year. But TS_SMOOTH only works for a vector. Anyone knows if there is
>> another function in IDL that I could use? I probably can use TS_SMOOTH
>> and for loops to get this, but it will be slow. In addition, there are
>> invalid data in my array as well.
>>
>> I've read discussions in this list about adding Dimension and NAN
>> keywords to other functions, such as Total, Median, etc., which are
>> very useful. Why nobody cares about TS_SMOOTH? Or am I asking a silly
>> question? Is there an obvious way to calculate the moving average of a
>> large array?
>>
>>
>> Thanks,
>> Jenny
>
> If x = FLTARR(800, 800, 365)
>
> try
>
> y = SMOOTH(x, [1, 1, 3])
>
> This runs a boxcar smoother, which has awful spectral characteristics.
> You also might want to consider what to do at the edges.
>
> Ken Bowman
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| Re: moving average of a large array [message #51499 is a reply to message #51487] |
Thu, 23 November 2006 19:58 |
Kenneth P. Bowman
Messages: 585
Registered: May 2000
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Senior Member |
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In article <1164296828.559622.31580@m7g2000cwm.googlegroups.com>,
"Jenny" <envi35@yahoo.ca> wrote:
> Hi, I want to calculate the moving average of a large array:
> data[800,800,365]. The moving average is for the 3rd dimension - day of
> year. But TS_SMOOTH only works for a vector. Anyone knows if there is
> another function in IDL that I could use? I probably can use TS_SMOOTH
> and for loops to get this, but it will be slow. In addition, there are
> invalid data in my array as well.
>
> I've read discussions in this list about adding Dimension and NAN
> keywords to other functions, such as Total, Median, etc., which are
> very useful. Why nobody cares about TS_SMOOTH? Or am I asking a silly
> question? Is there an obvious way to calculate the moving average of a
> large array?
>
>
> Thanks,
> Jenny
If x = FLTARR(800, 800, 365)
try
y = SMOOTH(x, [1, 1, 3])
This runs a boxcar smoother, which has awful spectral characteristics.
You also might want to consider what to do at the edges.
Ken Bowman
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| Re: moving average of a large array [message #51591 is a reply to message #51442] |
Mon, 27 November 2006 09:32 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Paul van Delst writes:
> Or you could label your code as opiniated software.
I just take it for granted that anyone who downloads
software from my web page knows it's opinioned software.
Otherwise, what's the point? :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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