[gradsusr] zinterp.gs

[Meredith Croke]

Hi Jeff,

I tried this and am still getting the same error, I attached the 2
scripts, thought this might be easier so you can see what I'm doing.
I'm not sure if this is necessary but in the test script (not in there
now) I also tried setting lev to zlev and got an error message with
that.

 

Thanks again for helping me out with this!

 

Meredith

 

From: gradsusr-bounces at gradsusr.org
[mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Jeffrey Duda
Sent: Thursday, April 21, 2011 4:52 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] zinterp.gs

 

Meredith,
No problem.  It took me awhile to figure out how to use functions like
this, too.

If you have the standard script from the website script library (that
begins like this:)

function zinterp(field,zgrid,zlev)


*----------------------------------------------------------------------
* 
* Bob Hart (hart at ems.psu.edu) /  PSU Meteorology
* 3/4/1999
*
* GrADS function to interpolate within a 3-D grid to a specified


* height level.  Can also be used on non-pressure level data, such
* as sigma or eta-coordinate output where height is a function
* of time and grid level.

then you need to put your call to the function outside of the code that
contains the function (i.e., either before the first line that says
"function zinterp(field,zgrid,zlev)" or after the last line
"Return(interp)".  The code says it will return to you a newly defined
variable called "interp".  Thus you will then want to display that
variable.  You can do it any of the ways suggested in the notes.  One
way I would suggest is:

'zinterp(temp,height,5000)'
'd interp'

See if following that method works.

Jeff

On Thu, Apr 21, 2011 at 3:25 PM, Meredith Croke <mcroke at airdat.com>
wrote:

Thanks Jeff, 

I should have mentioned, initially I tried running zinterp from a
script, but once that wasn't working I was trying to trouble shoot on
the command line.  I tried your suggestion and put
'zinterp(tmpprs,hgtprs,5000)' as the first line in the zinterp.gs
script, I then tried running a very short script that just opened a ctl
file and 'd zinterp(tmpprs,hgtprs,5000)'

I again get the following error: 

Syntax Error:  Invalid Operand 

  'zinterp' not a variable or function name

  Error ocurred at column 1

DISPLAY error:  Invalid expression 

  Expression = zinterp(tmprs,hgtprs,5000)

 

I also tried putting 'zinterp(tmpprs,hgtprs,5000)' on the second line of
zinterp.gs (under function zinterp(field,zgrid,zlev)) and got the same
error.

Not sure what I'm missing.

 

Thanks for the help,

Meredith

 

 

From: gradsusr-bounces at gradsusr.org [mailto:
gradsusr-bounces at gradsusr.org] On Behalf Of Jeffrey Duda
Sent: Thursday, April 21, 2011 3:45 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] zinterp.gs

 

Meredith,
To my knowledge, you can't run a function from the Grads command prompt.
Instead, you need to put in a call to it inside a script that contains
the function code.  Thus, just put the line
'zinterp(tmpprs,hgtprs,5000)' as the first line of code in the 
zinterp.gs script file.

Jeff Duda

On Thu, Apr 21, 2011 at 2:02 PM, Meredith Croke <mcroke at airdat.com>
wrote:

Hi Grads Users,



I'm trying to use the zinterp.gs function to determine the 6km wind from
model data that is output on pressure levels, however I'm running into
some issues with zinterp.gs.



To test the function I am attempting to run it from the command line and
follow the samples in the script, so I have tried

'd zinterp(tmpprs,hgtprs,5000)', to display a temperature field at 5000,
however I receive this error:

Syntax Error:  Invalid Operand

 'zinterp' not a variable or function name

 Error ocurred at column 1

DISPLAY error:  Invalid expression

 Expression = zinterp(tmpprs,hgtprs,5000)



The function is in my directory,  what else do I need to do to get this
to work?

I am using grads v1.9b4



Thanks for your help.



Regards,



Meredith




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-- 
Jeff Duda
Iowa State University
Meteorology Graduate Student
3134 Agronomy Hall
www.meteor.iastate.edu/~jdduda <http://www.meteor.iastate.edu/%7Ejdduda>



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-- 
Jeff Duda
Iowa State University
Meteorology Graduate Student
3134 Agronomy Hall
www.meteor.iastate.edu/~jdduda

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