comp.lang.idl-pvwave archive: archive » Interpolate the NaN in 2D array.

Home » Public Forums » archive » Interpolate the NaN in 2D array.

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Interpolate the NaN in 2D array. [message #91511 is a reply to message #91508]

Wed, 22 July 2015 12:11

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Wednesday, July 22, 2015 at 2:04:53 PM UTC-4, Paul van Delst wrote:
> On 07/22/15 13:14, a**@gmail.com wrote:
>> Hi everyone,
>>
>> I have a question about 2D interpolation with NaN inside. My doubt is
>> how I proceed to interpolate NaN inside the 2D array.
>
> Filter them out?
>
> INTERPOL has a /NAN keyword. But you can do it yourself too.

INTERPOL() is only for 1-d data I believe. But I would probably start by averaging the result of using INTERPOL() over a row, and INTERPOL() over a column. A more "correct' way would be to use the very powerful -- and very complicated -- GRIDDATA() function, but this is only for the ambitious.

For a similar problem I have used the maskinterp package by Joe Harrington ( https://physics.ucf.edu/~jh/ast/software.html ) but again it is not very user-friendly. However, in my case I had to make sure that I did not bias my results when interpolating over multiple NaN values, and this package is good for this.

Report message to a moderator

[Message index]

		Interpolate the NaN in 2D array. By: anagetinga on Wed, 22 July 2015 10:14
		Re: Interpolate the NaN in 2D array. By: Paul Van Delst[1] on Wed, 22 July 2015 11:04
		Re: Interpolate the NaN in 2D array. By: wlandsman on Wed, 22 July 2015 12:11
		Re: Interpolate the NaN in 2D array. By: Haje Korth on Thu, 23 July 2015 04:58
		Re: Interpolate the NaN in 2D array. By: wlandsman on Thu, 23 July 2015 20:40

Previous Topic:	compass search
Next Topic:	!x/y.window & convert_coord giving unwanted offset to my image scale

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 20:09:02 PDT 2025

Total time taken to generate the page: 0.01380 seconds