nlfilter undefined error

[Chethan S]

Hi all!

I have a function written in MATLAB which goes as follows:

function dir(subfn)

...................

fh = eval(['@' subfn]); % Function handles
I2 = uint8(nlfilter(I, [7 7], subfn));

...............

function [gamma] = ew(I)

.........

end

function [gamma] = nw(I)

.........

end

function [gamma] = nd(I)

........

end

end

When I try calling the function as I call it in MATLAB,

octave:4> dir('ew')

I get the following error:

error: `nlfilter' undefined near line 16 column 12
error: evaluating argument list element number 1
error: called from:
error:   /home/chethan/dir.m at line 16, column 4

Do I have to change anything in the nlfilter line or is calling functions/function handles different in Octave? In MATLAB it works fine without any errors.

Thanks and regards,

Chethan S.