Function handle invoking Java reports syntax error?

2012 3 6
1 个回答
1 次查看（30 天）

0 个投票

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 个评论
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Ahmed Fasih
Ahmed Fasih 2012-3-7
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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回答（1 个）

Laurens Bakker
Laurens Bakker 2012-3-7

0 个投票

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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