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Building script commands from string

Getting the restricted parameters...

Re: [Gretl-users] GMM run finishes...

Ofer Cornfeld

Tuesday, 9 November 2010 Tue, 9 Nov '10

12:58 p.m.

Hi, What is the best way to construct commands such as GMM commands on the fly? Assuming I have the string containing the GMM command to be executed, built from other strings or from input file How can I execute it? With kind regards, Ofer Cornfeld TAU

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Sven Schreiber

Tuesday, 9 November Tue, 9 Nov

1:42 p.m.

Am 09.11.2010 13:58, schrieb Ofer Cornfeld:

Hi, What is the best way to construct commands such as GMM commands on the fly? Assuming I have the string containing the GMM command to be executed, built from other strings or from input file How can I execute it?

One possibility in principle: 1. use the 'outfile' command 2. use 'print'/'printf' statements to write your gretl commands to the chosen file 3. use the 'run' and/or 'include' commands to execute the resulting script file I guess you will have to worry a bit about path searching and such. I'm not aware of a way to execute the commands directly from a string variable instead of a file. In general I guess it's fair to say that gretl-script is not a full-fledged programming language built for such "meta programming". Personally I would probably recommend to use another language like Python (other choices are possible of course) to build the gretl command string (or script file) and then call the CLI version of gretl from your meta Python program to execute the gretl commands. HTH and good luck, sven

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Riccardo (Jack) Lucchetti

2:42 p.m.

On Tue, 9 Nov 2010, Sven Schreiber wrote:

Am 09.11.2010 13:58, schrieb Ofer Cornfeld: > Hi, > > > > What is the best way to construct commands such as GMM commands on the fly? > > Assuming I have the string containing the GMM command to be executed, > built from other strings or from input file > > How can I execute it? > One possibility in principle: 1. use the 'outfile' command 2. use 'print'/'printf' statements to write your gretl commands to the chosen file 3. use the 'run' and/or 'include' commands to execute the resulting script file

Sven's approach is most definitely the "right" one if you have several commands. However, for shorter stuff the "@" operator is your friend. Try this: <script> open data3-1 string cmd = "summary" @cmd </script> Having said this, for the gmm command it's probably advisable to rely on functions, as in the follwing example, which uses GMM to compute an average :-) <script> function series orthcond(series x, matrix theta) m = theta[1] return x - m end function open data3-1 m = {0} matrix V = I(1) list Z = const series e gmm e = orthcond(sqft, m) orthog e ; Z weights V params m end gmm --verbose </script> Riccardo (Jack) Lucchetti Dipartimento di Economia Università Politecnica delle Marche r.lucchetti(a)univpm.it http://www.econ.univpm.it/lucchetti

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Ofer Cornfeld
Riccardo (Jack) Lucchetti
Sven Schreiber