comp.lang.idl-pvwave archive: archive » Fourier transform with missing data.

Home » Public Forums » archive » Fourier transform with missing data.

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

Fourier transform with missing data. [message #1620]

Thu, 13 January 1994 10:31

rfinch
Messages: 51
Registered: March 1991

Member

Followup-To: sci.math.num-analysis

We are doing Fourier transforms of hydrologic timeseries data and a
question occurred to us. This data often has missing values. Right
now we just remove the missing data and create a new 1-d array with
only the good data; this means there will be abrupt jumps in the data.
Then we pass the new vector to the FFT routine.

Is this the right way to handle missing data? Should they perhaps be
zeroed out, instead of removed? I think of this as an alternative
only because some textbooks advise padding your vector with zero's to
get the vector length to a power of 2.
--
Ralph Finch 916-653-8268 voice
rfinch@venice.water.ca.gov 916-653-6077 fax
Any opinions expressed are my own; they do not represent the DWR

Report message to a moderator

[Message index]

Fourier transform with missing data.

By: rfinch on Thu, 13 January 1994 10:31

Previous Topic:	shading (polyfill) of continents outlines. How to ?
Next Topic:	I/O to and from /dev/tty00

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Dec 03 10:10:40 PST 2025

Total time taken to generate the page: 1.37142 seconds