Re: [ferret_users] string variable as file name

[Chao YUE <chaoyuejoy@xxxxxxxxx>]

Thank you Paulo and Ansley,

 

I tried, and the correct one should be:

 

yes? let filename= "/home/data01/OUTPUT_A5F_SP2/hist_spinup.nc"
yes? use "`filename`"

 

we must put the double quotation marks beside the embedded _expression_ because the grave accent will give only the VALUE of the varialbe, so in the case of

 

yes? use `filename`,  it will give error to say:

**ERROR: unknown command qualifier: home

becuase ferret interpreted the command as:

 

set data /home/data01/OUTPUT_A5F_SP2/hist_spinup.nc

 

it interpret /home as qualifier, but in the case of:

yes? use "`filename`"

 

ferret interpret as:

set data "/home/data01/OUTPUT_A5F_SP2/hist_spinup.nc"

That's why it's correct. A good chance of study for me!!

 

cheers,

 

Chao

2011/5/20 Ansley Manke <ansley.b.manke@xxxxxxxx>

Hi -
The reason for this is that Ferret needs the VALUE of the variable, the string filename in this case, in order to use it in the command line.
http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/variables-xpressions/EMBEDDED-XPRESSIONS/

-ansley

On 5/20/2011 9:02 AM, Paulo Santiago wrote:

Hi Chao,

Try

yes? let filename= "/home/data01/OUTPUT_A5F_SP2/hist_spinup.nc"
yes? use `filename`

(delimit variable with grave accent)

Cheers,

Paulo Santiago

2011/5/20 Chao YUE <chaoyuejoy@xxxxxxxxx>

Dear all,

A very simple question, why I if use

yes? use "/home/data01/OUTPUT_A5F_SP2/hist_spinup.nc"  it works.

but if I do like this:
yes? let filename= "/home/data01/OUTPUT_A5F_SP2/hist_spinup.nc"
yes? use filename

it will fail?

The problem is simplified because I want to use the file names stored in a string array.

Thanks a lot,

Chao

--

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Chao YUE
Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL)
UMR 1572 CEA-CNRS-UVSQ
Batiment 712 - Pe 119
91191 GIF Sur YVETTE Cedex

Tel: (33) 01 69 08 77 30; Fax:01.69.08.77.16

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--

Paulo Santiago

Doutorado em Meteorologia

Programa de Pós-Graduação em Meteorologia

Instituto Nacional de Pesquisas Espaciais

Tel.: (12) 3186 8637

--

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

Chao YUE
Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL)
UMR 1572 CEA-CNRS-UVSQ
Batiment 712 - Pe 119
91191 GIF Sur YVETTE Cedex

Tel: (33) 01 69 08 77 30; Fax:01.69.08.77.16

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