[ncl-talk] Passing a variable value from NCL to bash Script

[Dennis Shea]

On a related note ....

The just released 6.4.0 has a function that may be of use in some instances:

       http://www.ncl.ucar.edu/Document/Functions/Contributed/cla_sq.shtml



On Wed, Mar 1, 2017 at 6:59 AM, Rick Brownrigg <brownrig at ucar.edu> wrote:

> Hi,
>
> If I understand correctly, you can pass in the values on the command-line
> invocation of NCL as:
>
>    ncl w1=X  dw1=Y
>
> where X and Y are the actual values.  To pass in string arguments, we tell
> people to place quotes around the whole var=value pair, like:
>
>    ncl 'myStringVar="foo"'
>
> You can find more info about passing in arguments at:
>
>    http://ncl.ucar.edu/Document/Manuals/Ref_Manual/NclCLO.shtml
>
> Hope that helps...
> Rick
>
> On Wed, Mar 1, 2017 at 12:20 AM, Abheera Hazra <hazra.abheera at gmail.com>
> wrote:
>
>> Hi,
>>
>> I am using NCL to calculate a few terms for an optimization algorithm and
>> I am calling the NCL function from within a 'while loop' in a bash script.
>> The 'while loop' runs till a certain condition is met and for the condition
>> to be met, the bash script needs to accept a new value for an existing
>> variable from the NCL script. I have tried using system, systemfunc with
>> even the export command but nothing seems to work. The code looks as
>> follows:
>>
>> ------------------------------------------
>> #!/bin/bash
>>
>> w1=0.4
>> dw1=0.1
>> inc=0.001
>>
>> while awk 'BEGIN { if ('$dw1'<'$inc') {exit 1}}'; do
>>
>> cat <<'EOF' >> opti.error.ncl
>>
>> ;;;;Perform certain computations on w1 and update the w1 and dw1
>> w1=nw1
>> dw1=ndw1
>>
>>       system("w1=" + w1)
>>       system("dw1=" + dw1)
>>
>> ;;;;w1 and dw1 need to be passed to the bash script
>>
>> EOF
>>
>>
>>  ncl k1=${w1}  dw11=${dw1}  opti.error.ncl
>>
>> echo $w1
>> echo $dw1
>>
>> done
>> ------------------------------------------
>>
>> But this does not update w1 and dw1 values. Any input would be greatly
>> appreciated.
>>
>> Thanks,
>> Abheera
>>
>>
>>
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>
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