#581 Undefined variable error

v4.1 (minor)
open
M-Files (31)
5
2014-04-22
2013-02-09
No

While having nested functions, in a parent function, they don't recognise the variables defined in the parent one. Matlab does that and it is really annoying since neither declaring them global works. Please fix.

Discussion

  • Samit Basu

    Samit Basu - 2013-03-31
    • assigned_to: nobody --> samitbasu
     
  • Samit Basu

    Samit Basu - 2013-03-31

    Please post an example.

     
  • Vasilis Nicolaou

    Example
    Function f=my_function(input)
    constant = 5
    Function g=eqation(init)
    do something with constant

     
  • Tunococ

    Tunococ - 2014-04-22

    I just encountered this too. MATLAB and Octave allow nested functions to access variables in the scope of the enclosing function. This makes it possible to define, for example, a non-anonymous function that relies on some input arguments of the enclosing function. For example, the following function is supposed to add scalar to each entry of X:

    function Y = addscalar(X, scalar)
    
      function z = addentry(x)
        z = x + scalar;
      end
    
      Y = arrayfun(@addentry, X);
    
    end
    

    FreeMat will complain that scalar is unknown in the scope of addentry. This works, however, if I define addentry as an anonymous function:

    function Y = addscalar(X, scalar)
    
      Y = arrayfun(@(x) x + scalar, X);
    
    end
    

    Of course the functionality of addscalar itself is not important here as + already operates this way.

    The thing is sometimes the function of which the handle will be passed as an argument to another function cannot be written as an anonymous function.

     

Log in to post a comment.

Get latest updates about Open Source Projects, Conferences and News.

Sign up for the SourceForge newsletter:





No, thanks