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Ahmed Fasih

Ahmed Fasih (view profile)

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Function handle invoking Java reports syntax error?

Asked by Ahmed Fasih

Ahmed Fasih (view profile)

on 6 Mar 2012
Why does
d='.'; mylength = length(java.io.File(d).listFiles(org.apache.commons.io.filefilter.WildcardFileFilter('*.dat')))
work, but a function handle for input "d" fail with a syntax error?
length_func = @(d) length(java.io.File(d).listFiles(org.apache.commons.io.filefilter.WildcardFileFilter('*.dat')))
??? Error: Expression or statement is incorrect--possibly unbalanced (, {, or [.

  1 Comment

Ahmed Fasih

Ahmed Fasih (view profile)

on 7 Mar 2012
This following does work:
helper=@(f) f.listFiles(org.apache.commons.io.filefilter.WildcardFileFilter('*.dat'))
length_func = @(d) length(helper(java.io.File(d)))

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1 Answer

Laurens Bakker

Laurens Bakker (view profile)

Answer by Laurens Bakker

Laurens Bakker (view profile)

on 7 Mar 2012

Hi Ahmed,
anonymous functions are not allowed to store any data, and accessing a field of java.io.File(d) probably implicitly does this.
Cheers,
Laurens

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