Difficult without seeing the code.
the idea is to try not storing what is currently in my-row-data anywhere.
So if you can create a function that returns what is currently stored in
my-row-data, and pass that function to your function t, then the head of
your sequence will not be retained in any variable, so it can be garbage
collected while doseq is still working on the rest of the sequence.
Your code could be changed as :
(defn t [filename my-row-data-fn]
(with-open [w (java.io.FileWriter. (java.io.File. file-name))]
(doseq [l (my-row-data-fn)]
(.write w (str (output-array (first l) ",")
"@"
(output-array (second l) ",")
"\n")))))
Hope this helps, if not, you will have to show us more code above the t
function,
--
Laurent
2009/4/2 fitzpatrick...@googlemail.com <fitzpatrick...@googlemail.com>
>
> Apologies for my ignorance ,i am new to clojure, but can you give an
> example of what the code should look like. I understand my-row-data is
> lexical as it defined outside the function but i don't understand how
> to implement this new function.
> tks,
> PJ
>
> On Apr 2, 1:03 pm, Laurent PETIT <laurent.pe...@gmail.com> wrote:
> > You're holding the head, because my-row-data is defined in the lexical or
> > dynamic scope of the function, and holds the head.
> >
> > Try creating a function returning the seq that is currently stored in
> > my-row-data and call it instead : (my-row-data)
> >
> > --
> > Laurent
> >
> > 2009/4/2 fitzpatrick...@googlemail.com <fitzpatrick...@googlemail.com>
> >
> >
> >
> > > Hi,
> > > Thanks for the replies.
> >
> > > I have adapted the code above with my example. I still get the heap
> > > error!
> > > my-row-data is the lazy sequence. each element in the seq is a 2
> > > element vector of Java String[]
> > > output-array is just a printing function for the String[]. For
> > > convenience i place a @ between the two outputs.
> >
> > > (defn t [file-name]
> > > (with-open [w (java.io.FileWriter. (java.io.File. file-name))]
> > > (doseq [l my-row-data]
> > > (.write w (str (output-array (first l) ",")
> > >
> "@"
> >
> > > (output-array (second l) ",")
> >
> > > "\n")
> >
> > > )
> > > )
> > > )
> > > )
> >
> > > tks,
> > > PJ
> >
> > > On Apr 2, 12:15 pm, Christian Vest Hansen <karmazi...@gmail.com>
> > > wrote:
> > > > On Thu, Apr 2, 2009 at 11:58 AM, fitzpatrick...@googlemail.com
> >
> > > > <fitzpatrick...@googlemail.com> wrote:
> >
> > > > > Hi,
> > > > > I am attempting to print a large lazy seq to file. I have attempted
> > > > > various approaches and obviously am missing something obvious.
> > > > > I have attempted do use do-seq and also iterated manually through
> the
> > > > > sequence but i always come up with the heap error.
> > > > > Has anyone got any suggestions?
> >
> > > > Don't hold on to the head of the seq.
> >
> > > > It may not be obvious where, but you are most likely holding on the
> > > > the head of the seq, which prevents the elements from being GC'd as
> > > > you iterate them.
> >
> > > > > tks,
> > > > > PJ
> >
> > > > --
> > > > Venlig hilsen / Kind regards,
> > > > Christian Vest Hansen.
> >
>
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Clojure" group.
To post to this group, send email to clojure@googlegroups.com
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
-~----------~----~----~----~------~----~------~--~---
