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Parsing data file

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Michael Poss

Parsing data file

Hi everybody

Modeling languages (e.g. Mosel) feature simple ways to initialize parameters from data files. In Mosel for instance, if SET has been declared as a set using

SET : set of string,

then its content can be read easily using

initializations from "sets.dat"

SET

end-initializations

The same can be done for arrays and even user-defined types. I believe this spares a lot of time for beginners, who may have a hard time implementing a parser. Do you know if something like that exists in Julia ?

Michael.

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Miles Lubin

Re: Parsing data file

Hi Michael,

Since Julia is a regular programming language that is perfectly capable of reading in data in various forms (CSV, SQL, JSON, etc.), either via built-in commands like readcsv or via external packages, we leave this task for the user. JuMP is much more similar to the solver API interfaces than to Mosel, AMPL, etc. in this regard.

Miles

On Friday, December 2, 2016 at 5:28:09 AM UTC-5, Michael Poss wrote:

Hi everybody

Modeling languages (e.g. Mosel) feature simple ways to initialize parameters from data files. In Mosel for instance, if SET has been declared as a set using

SET : set of string,

then its content can be read easily using

initializations from "sets.dat"
SET
end-initializations

The same can be done for arrays and even user-defined types. I believe this spares a lot of time for beginners, who may have a hard time implementing a parser. Do you know if something like that exists in Julia ?

Michael.

Changhyun Kwon

Re: Parsing data file

Here is one such example:

https://github.com/chkwon/jpor_codes/blob/master/chap6/transportation1.jl

https://github.com/chkwon/jpor_codes/blob/master/chap6/transportation.csv

where the data file is in CSV format.

On Dec 2, 2016, at 2:31 PM, Miles Lubin <[hidden email]> wrote:

Hi Michael,

Since Julia is a regular programming language that is perfectly capable of reading in data in various forms (CSV, SQL, JSON, etc.), either via built-in commands like readcsv or via external packages, we leave this task for the user. JuMP is much more similar to the solver API interfaces than to Mosel, AMPL, etc. in this regard.

Miles

On Friday, December 2, 2016 at 5:28:09 AM UTC-5, Michael Poss wrote:
Hi everybody

Modeling languages (e.g. Mosel) feature simple ways to initialize parameters from data files. In Mosel for instance, if SET has been declared as a set using

SET : set of string,

then its content can be read easily using

initializations from "sets.dat"
SET
end-initializations

The same can be done for arrays and even user-defined types. I believe this spares a lot of time for beginners, who may have a hard time implementing a parser. Do you know if something like that exists in Julia ?

Michael.

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Michael Poss

Re: Parsing data file

In reply to this post by Michael Poss

Hell

Thank you both for your answers. It is true that readcsv is quite direct. Yet I was thinking about something even more beginner-friendly, e.g.

parameter = readfile("data.dat", "parameter"),

where data.dat would contain

parameter = [1 0 1 1]

Possibly I'll do it ...

Best,

Michael.

Le vendredi 2 décembre 2016 11:28:09 UTC+1, Michael Poss a écrit :

Hi everybody

Modeling languages (e.g. Mosel) feature simple ways to initialize parameters from data files. In Mosel for instance, if SET has been declared as a set using

SET : set of string,

then its content can be read easily using

initializations from "sets.dat"
SET
end-initializations

The same can be done for arrays and even user-defined types. I believe this spares a lot of time for beginners, who may have a hard time implementing a parser. Do you know if something like that exists in Julia ?

Michael.