[gradsusr] Pass Data via the 'Return' Expression

Mon Apr 26 15:42:39 EDT 2010

Hi John,
Thanks for the information.  I had read the instructions on the use of gsfpath before posting to the list.  

I've tried every combination of it as follows with no good result. In the main script I tried:
rc = gsfpath("\mark\b")
rc = gsfpath("/mark/b")
rc = gsfpath("c:\mark\b")
rc = gsfpath("c:/mark/b")

In all instances, the main script hangs on execution of the gsfpath command. It appears to not be able to find the path.

But  if the .gsf file is in the same directory as the main script all works fine (with the gfspath command  commented out).  Grads just doesn't seems to want to navigate to another directory that is at the same level as the directory that it is being executed out of. I've had problem with pathing in the past and had to use the unmount command to resolve it.   

But no fear, there  is another solution.....

After re-reading Brians suggestions and after having previous limited success with the 'run' command, I have something that works.  

*--Main Script (located in c:/mark/a)--
'run c:/mark/b/script2.gs 'var1' 'var2' 'var3
answer = result

*--Second Script (located at c:/mark/b)-- 
function script2 (args)
    vara  = subwrd(args,1)
    varb = subwrd(args,2)
    varc = subwrd(args,3)

--process the variables--

return(final_value)

One can send the results of script 'b' via the return command, and script 'a' can read those results easily by just reading the result variable and setting it equal to some new variable name. This is all I was trying to accomlish with my original post.  

So the problem is solved.  Thanks everyone for all your help.  Hopefully this will be useful to other users.  

Thanks,
Mark

----- Original Message -----
From: John Huddleston 
To: GrADS Users Forum 
Sent: Mon, 26 Apr 2010 14:45:41 +0000 (UTC)
Subject: Re: [gradsusr] Pass Data via the 'Return' Expression

Good morning Mark,

Sorry for the delay, we had nearly three inches of rain followed

by four inches of snow and I was sequestered at home until today.

See http://www.iges.org/grads/gadoc/gadocindex

and click on the gsfpath() indexed item.

There are some steps for you to complete; according to the

instructions on that page.

It does appear that those paths must be the full path, e.g. rc =

gfspath(/home/mark/b /home/mark/a)

Here is a snippet from the page

The private path directory list is an optional list that is

provided via the gsfpath function: 
rc = gsfpath("dirlist")
If used, the declaration of the

private path directory list should appear at the top of the main script just

underneath the statement enabling the dynamic script loading. 
For example, if our main script "do_eof.gs" is

executed with the command: 
run /usr/local/gradslib/do_eof
and this script file contains the following lines at the

front: 
rc = gsfallow("on")
rc

= gsfpath("math1 string2") 
and the script calls a function str_chop which is not found in the main script, then the search

path would be: 

/usr/local/gradslib/str_chop.gsf 
/usr/local/gradslib/math1/str_chop.gsf 
/usr/local/gradslib/string2/str_chop.gsf 

John

John Huddleston, PhD

From: gradsusr-bounces at gradsusr.org

[mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Mark Sponsler
Sent: Friday, April 23, 2010 2:36 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] Pass Data via the 'Return' Expression

John,
I

hate to be a pain but am still having problems.

So if my main script is here: c:/grib/a/main_script.gs  and the

called script is here: c:/grib/b/called.gfs

Then I

should set gfspath as follows:

rc =

gsfpath("../b") 

Unfortunately the

script hangs on the gfspath command. 

I've

tried it with both \ and / too.  

Any

suggestions?

Thanks,

Mark

----- Original Message -----

From: "John Huddleston" <Huddleston at cira.colostate.edu>

To: "GrADS Users Forum" <gradsusr at gradsusr.org>

Sent: Friday, April 23, 2010 11:45:23 AM GMT -08:00 US/Canada Pacific

Subject: Re: [gradsusr] Pass Data via the 'Return' Expression

Mark,

The Windows builds use the Cygwin "UNIX" style of

paths. So, if you want to go up one directory and then down into another, use

the ".." parent directory. The "." directory is the current

directory.

John Huddleston, PhD

From:

gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] On Behalf Of Mark

Sponsler [msponsler at comcast.net]
Sent: Friday, April 23, 2010 9:39 AM
To: GrADS Users Forum
Subject: Re: [gradsusr] Pass Data via the 'Return' Expression

Brian,
Excellent

addtional examples.  I am using gfsallow right now, and it works fine if

the 'b' script is in the same directory as the 'a' script. 
But

now I'm kinda stuck because I want the b script to be in a different

directory. I'm trying to set up a bunch of common scripts

in a standalone directory, so they can be accessed from any grads script

elswhere on the drive. So pathing is now the issue.

I'm

trying to locate 'script b' using gfspath.

Say

'script a' is here: c:/grib/a   (and executed from that

location),  and 'script b' (the .gsf script) is here: c:/grib/b

I

can't seem to figure out how to get gfspath to go 'up' one directory, then down

into directory b        
I

tried 
rc =

gsfpath("./b") but the scripts hangs on the gfspath command. 

I'm on

a Windows build of Grads. 

Thanks,

Mark

----- Original Message -----

From: "Brian Doty" <doty at cola.iges.org>

To: "GrADS Users Forum" <gradsusr at gradsusr.org>

Sent: Thursday, April 22, 2010 7:42:56 PM GMT -08:00 US/Canada Pacific

Subject: Re: [gradsusr] Pass Data via the 'Return' Expression

The "gsfallow" stuff is usually the better solution, but I will also

note that if you have a main script that issues the run command to grads, ie: 

"run myscript.gs

"args

and if that script returns something via the return statement, then that string is available to

the first script in the result variable. 

Example:

script a:

"run b.gs testing"

say

"--->"result"<---"

script b:

function b(args)

return(subwrd(args,1))

If you run a.gs from within grads, you should see the following

line output:

---->testing<----

...Brian

On Apr 21, 2010, at 8:42 PM, Mark Sponsler wrote:

Charles,

It works perfectly now.  Excellent example you provided. I had previous

read the tutorial provided, but never really understood the implications of it

all until I saw your example. It makes perfect sense now. 

Thanks so much for taking the time to help.   Would have never

figured it out on my own.   

Thanks again,

Mark

----- Original Message -----

From: Charles Seman 

To: GrADS Users Forum 

Sent: Wed, 21 Apr 2010 23:47:00 +0000 (UTC)

Subject: Re: [gradsusr] Pass Data via the 'Return' Expression

Hi Mark,

Please find attached main.gs (calling script) and add1.gsf (GrADS script 

function).

***********************

* Main script

***********************

rc = gsfallow("on")

iVal = 1

  say 'iVal = 'iVal

  say 'Making Call to GrADS script function "add1"'

oVal = add1(iVal)

  say 'Call Made - Checking for Answer'

  say 'oVal = 'oVal

Try using GrADS main script as follows:

ga-> main.gs

iVal = 1

Making Call to GrADS script function "add1"

input val = 1

new val = 2

Passing Variable Back to Main Script

Call Made - Checking for Answer

oVal = 2

in main.gs, a call is made to an external user-defined script function 

"add1.gsf" (http://grads.iges.org/grads/gadoc/gsf.html) and can

be 

called from *outside* of main.gs because of "rc =

gsfallow("on")" in 

main.gs and because of the suffix "gsf" for "add1.gsf"...

first, if only the line "rc = gsfallow("on")" is commented

out (add1.gsf 

exists), the result (you can try this):

ga-> main.gs

iVal = 1

Making Call to GrADS script function "add1"

Function not found:

add1           

  Error occurred on line 12

  In file main.gs

next, if the line "rc = gsfallow("on")" is active, but

add1.gsf is 

renamed to add1.gs (you can try this):

ga-> main.gs

iVal = 1

Making Call to GrADS script function "add1"

Function not found:

add1           

  Error occurred on line 12

  In file main.gs

Hope this helps,

Chuck

Mark Sponsler wrote:

>

> Hi Chales,

> I took a look at the script you referenced and was similar to others 

> I've seen where the main script and the subscripts are all encased

in 

> the same physical file.  What I'm trying to accomplish is to

have a 

> main script in one directory and a bunch of scripts of comomonly

used 

> routines in a separate directory. The idea is to have the main

script 

> call one of the common routines, then have the common routine pass 

> some variable data back to the main script for additional

processing. 

>

> Below is a simple example with both scripts in the same directory.

The 

> problem is the value  _val1  never gets returned to

the main script.  

> I'm using Grads 1.9 on WinXP.

>

> Any thoughts or ideas would be welcome!

>

> ***********************

> * Main script

> ***********************

>

> rc = gsfallow("on")

>

> val = 1

>

>   say 'Val = 'val

>   say 'Making Call to Test_Call'

>

> 'run test_call.gs 1'

>

>   say 'Call Made - Checking for Answer'

>

>   say 'New val = '_val1

>

>

> Here's the called script

> ************************

> * Seconadry Script

> ************************

> function main (args)

> if (args='')

>   say 'No argument provided.  Argument must be a value

1-10'

>   return

> else

>   val = subwrd(args,1)

> endif

>

>  say 'Val = 'val

>

> _val1 = (val + 1)

>

>  say 'New Val = '_val1

>

>  say 'Passing Variable Back to Main Script'

>

>   return(_val1)

>

> Thanks,

> Mark

>

>

> ----- Original Message -----

> From: Charles Seman

> To: GrADS Users Forum

> Sent: Tue, 20 Apr 2010 21:21:12 +0000 (UTC)

> Subject: Re: [gradsusr] Pass Data via the 'Return' Expression

>

> Mark,

>

> Don't know if you have resolved this yet, but Bob Hart's

"plotskew.gs"

> script has examples of what it appears that you want to do:

> http://www.iges.org/grads/gadoc/library

> ftp://grads.iges.org/grads/scripts/plotskew.gs

>

> Hope this helps,

> Chuck

>

> Mark Sponsler wrote:

> >

> > I have a script that calls a second script (and passes some arguments

> > to it). That works fine. I'm trying to get the second script to

return

> > some data back to the first script, but am having

difficulty.  I use

> > the 'return' command to have the second script return control back

the

> > first script, but cannot seem to get any variable data to pass with

> > it. It seems this is possible per the Grads documentation:

> >

> >  

> >

> >  

> >

> > To return from a function, use the |return| command:

> >

> >     |return /expression/|

> >

> >     The |/expression/| is optional; if not

provided, a NULL string

> >     will be returned. (A null string is: '') The

result of the

> >     function is the result of the expression

specified on the return

> >     command.

> >

> >  

> >

> > In the second script, the last line is:

> >

> >  

> >

> > return val1

> >

> >  

> >

> > Where val1 is a variable string

> >

> >  

> >

> > Just can't seem to get the first script to read the contents of

> > val1. Could always write the data to a file, but am looking for

> > something a little more elegant.

> >

> >

> >  

> >

> > Any help would be appreciated,

> > Mark

> >

> >

------------------------------------------------------------------------

> >

> > _______________________________________________

> > gradsusr mailing list

> > gradsusr at gradsusr.org

> > http://gradsusr.org/mailman/listinfo/gradsusr

> >  

>

> -- 

>

> Please note that Charles.Seman at noaa.gov should be considered my NOAA

> email address, not cjs at gfdl.noaa.gov.

>

> ********************************************************************

> Charles

Seman                                Charles.Seman at noaa.gov

> U.S. Department of Commerce / NOAA / OAR

> Geophysical Fluid Dynamics

Laboratory         voice: (609)

452-6547

> 201 Forrestal

Road                              fax:

(609) 987-5063

> Princeton,

NJ  08540-6649            http://www.gfdl.noaa.gov/~cjs/

> ********************************************************************

>

> "The contents of this message are mine personally and do not reflect

any

> official or unofficial position of the United States Federal Government,

> the United States Department of Commerce, or NOAA."

>

> _______________________________________________

> gradsusr mailing list

> gradsusr at gradsusr.org

> http://gradsusr.org/mailman/listinfo/gradsusr

> ------------------------------------------------------------------------

>

> _______________________________________________

> gradsusr mailing list

> gradsusr at gradsusr.org

> http://gradsusr.org/mailman/listinfo/gradsusr

>   

-- 

Please note that Charles.Seman at noaa.gov should

be considered my NOAA

email address, not cjs at gfdl.noaa.gov.

********************************************************************

Charles

Seman                                Charles.Seman at noaa.gov

U.S. Department of Commerce / NOAA / OAR

Geophysical Fluid Dynamics

Laboratory         voice: (609)

452-6547

201 Forrestal

Road                              fax:

(609) 987-5063

Princeton, NJ  08540-6649            http://www.gfdl.noaa.gov/~cjs/

********************************************************************

"The contents of this message are mine personally and do not reflect any

official or unofficial position of the United States Federal Government,

the United States Department of Commerce, or NOAA."

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