Curve Fitting

[Bruce or Jennifer Ford <fordville_bruce@xxxxxxxxx>]

Ferreters!

I need to curve fit a best-fit line to many points on a scatter plot drawn
from many CDF files.  Any thoughts on how to do this?

Thanks in advance!

Bruce



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-----Original Message-----
From: Ansley Manke [mailto:ansley@pmel.noaa.gov]
Sent: Thursday, January 16, 2003 6:06 PM
To: bruce@fordville.org
Cc: ferret_users@ferret.wrc.noaa.gov
Subject: Re: Masking Land


Hi Bruce,
Yes, you can do this.  You'll need to have the land data on the
same grid as your NetCDF files, and then you can mask out
the points that correspond to land.  Here are the kinds of commands
you'll need.  The mask is set to 1 if the topography data is less
than 0, otherwise it has a bad-value flag.  my_grid is the grid of
the variable my_var.

  yes? use etopo60
  yes? use my_data
  yes? let  landmask = if rose[d=1,g=my_grid] LT 0 then 1
  yes? let masked_var =  my_var* landmask   ! then you can use this...

Ansley Manke

Bruce or Jennifer Ford wrote:

> Is there a way to mask over-land data points?  I'm using cdf files and
> overland areas skew my data.  Can I ignore datapoints that are designated
as
> land by etopo.60 files or earch_continents.nc?
>
> Thanks
>
> Bruce
>
> Spread the word!  EverythingDulcimer.com, the most complete dulcimer
website
> on earth!
> ------------------------
> Bruce W. Ford
> http://www.InciteScience.com
> http://www.EverythingDulcimer.com
> Learn - Exchange - Improve

--
Ansley Manke  Pacific Marine Environmental Laboratory  Seattle WA
(206)526-6246