Re: Curve Fitting

[Lynn deWitt <ldewitt@xxxxxxxxxxxxxxxxxxxx>]

Bruce,
   You might find the journal files regress(x,y,z,t).jnl do what you 
want.  Look in (ferret path)/ferret/go.  I've used them quite a bit - 
let me know if you need examples.  Lynn

At 9:54 PM -0500 1/20/03, Bruce or Jennifer Ford wrote:
> 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
>
>
>
> 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
>
> -----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
--------------------------------------------
Lynn deWitt

ldewitt@pfeg.noaa.gov

Pacific Fisheries Environmental Laboratories
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097
(831)-648-9036