Error with function handles of object methods

[WMennerich]

Is there somebody where this problem can be reproduced?
With this bug, the complete cellfun/arrayfun stuff does not work
with function handles from object methods.
W.Mennerich



WMennerich wrote:
> 
> Hello,
> I found a bug using objects:
> In short words: Function handles of object functions (methods) within
> the class directory (beginning with '@') can not be created.
> 
> I use Octave V3.2.0 (mingw binary) on WindowsXP.
> 
> I hope, this bug report contains enough details,
> otherwise just ask please.
> 
> 
> W.Mennerich
> 
> 
> 
> In the following the tests I made:
> 
> 
> 
> 
> 
> function test (<scalar>,<scalar>)
> [constructor in the '@test' directory
> *********************************
> function newtest=test(att1, att2)
> %constructor
> 
> switch nargin
> case 0
> newtest.att1=[];
> newtest.att2=[];
> case 2
> newtest.att1=att1;
> newtest.att2=att1+att2;
> end
> 
> newtest=class(newtest,'test');
> **********************************
> 
> 
> function sumAtts(<test>)
> [a method in the '@test' directory
> **********************************
> function res=sumAtts(this)
> res=this.att1+this.att2;
> 
> 
> 
> function get(<test>,<string>)
> [for testing function overloading,
> also inside '@test']
> **********************************
> function att=get(this,nameAtt)
> att=this.(nameAtt);
> 
> 
> 
> Test environment:
> ##################################
> ##################################
> 
> * Create all files
> 
> * Create '@test'
> 
> * Put all files into '@test'
> 
> * Put '@test' into octave path
> 
> 
> 
> Running the tests:
> ##################################
> ##################################
> 
> %Testing the class:
> %create three objects and put them into a cell array:
> 
> mytest1=test(33,44)
> mytest2=test(66,88)
> mytest3=test(132,176)
> 
> allmytests={mytest1 mytest2 mytest3}
> 
> 
> %Workspace of octave shows:
> 
> 
>   Attr Name            Size                     Bytes  Class
>   ==== ====            ====                     =====  =====
>        allmytests      1x3                         48  cell
>        mytest1         1x1                         16  test
>        mytest2         1x1                         16  test
>        mytest3         1x1                         16  test
> 
> 
> 
> 
> 
> %Testing of the sumAtts(<test>) function:
> 
>> sumAtts(mytest1)
> ans =  110
> 
> 
>> sumAtts(mytest2)
> ans =  220
> 
> 
>> sumAtts(mytest3)
> ans =  440
> 
> 
> 
> 
> 
> 
> %Function 'sumAtts' as input of an anonymous function works:
> 
>> cellfun(@(x) sumAtts(x),allmytests)
> ans =
> 
>    110   220   440
> 
> 
> 
> %Also the (overloaded) function  'get' works fine:
>> cellfun(@(x) get(x,'att1'),allmytests)
> ans =
> 
>     33    66   132
> 
> 
> %Using cellfun with a sumAtts handle does not work:
> 
>> cellfun(@sumAtts,allmytests)
> error: error creating function handle "@sumAtts"
> error: evaluating argument list element number 1
> error: error creating function handle "@sumAtts"
> error: evaluating argument list element number 1
> 
> 
> %The same also with overloaded 'get' function, gives another error:
> 
>> inStrings={'att1' 'att1' 'att1'}
> inStrings =
> 
> {
>   [1,1] = att1
>   [1,2] = att1
>   [1,3] = att1
> }
> 
>> cellfun(@get,allmytests,inStrings)
> error: octave_base_value::array_value(): wrong type argument `class'
> error: get: expecting graphics handle as first argument
> 
> 
> 
> 
> %Try to create a function handle outside of cellfun:
> 
>> fun=@sumAtts
> error: error creating function handle "@sumAtts"
> 
> %Non-class-functions work as handle:
> 
>> h=@rand
> h =
> 
> rand
> 
> 
>> h(4)
> ans =
> 
>    0.86496   0.62121   0.37157   0.41806
>    0.51272   0.49135   0.41006   0.67037
>    0.64824   0.25499   0.91680   0.27943
>    0.42406   0.77885   0.16088   0.15369
> 
> 
> 
> 
> %Workspace of octave shows:
> 
>   Attr Name            Size                     Bytes  Class
>   ==== ====            ====                     =====  =====
>        allmytests      1x3                         48  cell
>        h               1x1                          0  function_handle
>        inStrings       1x3                         12  cell
>        mytest1         1x1                         16  test
>        mytest2         1x1                         16  test
>        mytest3         1x1                         16  test
> 
> 
> 
> I checked also creating handles from selfwritten functions like e.g. foo.m
> this works also fine. Just creating handles from functions which belong to
> a user-class (i.e. they are here in the @test directory fail as handle)
> 

-- 
View this message in context: http://www.nabble.com/Error-with-function-handles-of-object-methods-tp24185732p24250428.html
Sent from the Octave - Bugs mailing list archive at Nabble.com.