[Octave-bug-tracker] [bug #40467] cellfun ignores UniformOutput=false sometimes & needs doc update

[Markus Appel]

URL:
  <http://savannah.gnu.org/bugs/?40467>

                 Summary: cellfun ignores UniformOutput=false sometimes &
needs doc update
                 Project: GNU Octave
            Submitted by: mappel
            Submitted on: Mon 04 Nov 2013 09:46:23 AM GMT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

cellfun presently has some issues:

(1)
For (most?) functions explicitly named in the documentation,
UniformOutput=false is ignored:


octave-gui:21> cellfun('isempty', {1 inf nan []}, "UniformOutput", false)
ans =

   0   0   0   1

octave-gui:22> cellfun('isreal', {1 inf nan []}, "UniformOutput", false)
ans =

   1   1   1   1


(2)
The documented function 'isclass' does not exist (has it been renamed to
'isobject'?)


octave-gui:23> cellfun('isclass', {1 inf nan}, "UniformOutput", false)
error: cellfun: not enough arguments for "isclass"
octave-gui:23> help isclass
error: help: 'isclass' not found
octave-gui:23> cellfun('isobject', {1 inf nan}, "UniformOutput", false)
ans = 
{
  [1,1] = 0
  [1,2] = 0
  [1,3] = 0
}


(3)
Personally, I find the documentation on "character string arguments" quite
confusing:


Additionally, `cellfun' accepts an arbitrary function FUNC in the form of an
inline function, function handle, or the name of a function (in a character
string).  In the case of a character string argument, the function must accept
a single argument named X, and it must return a string value.  The function
can take one or more arguments, with the inputs arguments given by C, D, etc.


The part about "must return a string value" does not seem to be required, but
the following form seems to be obsolete anyway:


octave-gui:26> cellfun('sin(x)', {1 2 inf nan}, "UniformOutput", false)
warning: cellfun: passing function body as a string is obsolete; please use
anonymous functions
ans = 
{
  [1,1] =  0.84147
  [1,2] =  0.90930
  [1,3] = NaN
  [1,4] = NaN
}


Cheers,
Markus




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