Or better still
chdir =: 1 !: 44 NB. define "change working directory"
verb
getcwd =: 1 !: 43 NB. define "query working directory"
verb
NB. Now start processing
chdir '/home/fork/example' NB. Set current working directory for
file operations
NB. Next check that everything worked OK when we tried to change the working
directory
NB. The return result may not necessarily be the identical string as used by
chdir,
NB. but I assume you already know that
getcwd ''
/home/fork/example
data =. fread 'stuff.csv' NB. fread uses working directory so
don't bother to give path
=============
Or for a simpler set and check you can do something like the following which
executes the verbs chdir and then getcwd -
get...@chdir '/home/fork/example/' NB. Set (and check) current
working directory for file operations
/home/fork/example
NB. The return
from chdir ('') is suitable as argument to getcwd
Ian
Ian Shannon
Landscape Modelling and Decision Support Section
Department of Environment, Climate Change & Water (NSW)
PO Box A290 Sydney South
NSW 1232
Phone: (02) 99 955 490
Mob: 0428 296 729
email: Ian (determinant) Shannon (atop) environment (determinant) nsw
(determinant) gov (determinant) au
web: http://www.environment.nsw.gov.au
Please consider the environment before printing my email
-----Original Message-----
From: Henry Rich
Sent: Friday, 26 March 2010 6:24 AM
Subject: Re: [Jgeneral] "Current working directory" in J?
Look in the Vocabulary under Foreigns then Files (1!:n)
1!:43 '' is like getcwd
1!:44 stringval is like chdir
So what you described is
1!:44 '/home/fork/example'
data =. 1!:1 <((1!:43 '') , '/stuff.csv')
or you could write
data =. 1!:1 <'/home/fork/example/stuff.csv'
Henry Rich
Sprague, Webb (OFM) wrote:
> Hi all,
>
> Does J have the notion of a current working directory, such that if one
> reads in data from a file that is specified with a relative path, J gets
> the working dir and finds the specified file relative to it.
>
> Along with this general knowledge, please tell me if there are functions
> to (1) return the string of the working directory, and (2) change to a
> working directory based on a string input.
>
> Forgive me, but I will have to give an example in very non-APL ish
> pseudo code:
>
> changdir ("/home/fork/example")
> data = readata(getcwd() + "/stuff.csv")
>
> data will then have the contents of file "/home/fork/example/stuff.csv".
>
> If there is a page that documents this, a link would be much
> appreciated. Thanks again for everyone's help and patience.
>
> W
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