Help please in interpreting Matlab code

[Terry Duell]

Hullo All,
I am trying to get some code written for Matlab, v7.3 I think, running in  
Octave 3.2.4, but have had trouble finding any info to help me interpret  
the code that Octave flags as a parse error.
The code is as follows (there are 4 lines of text);

         imedges2c1(:,4*i-3:4*i) =  
[cross(imcorners2c1(:,1),imcorners2c1(:,4)), ... = [ y4-y1 ; x1-x4 ;  
x4*y1-x1*y4 ]
                       			    cross(imcorners2c1(:,2),imcorners2c1(:,1)),  
...
                                                
cross(imcorners2c1(:,3),imcorners2c1(:,2)), ...
                                                
cross(imcorners2c1(:,4),imcorners2c1(:,3))];


Octave flags the error as;


  syntax error

> > >          imedges2c1(:,4*i-3:4*i) =  
> > > [cross(imcorners2c1(:,1),imcorners2c1(:,4)), ... = [ y4-y1 ; x1-x4 ;  
> > > x4*y1-x1*y4 ]
                                                                                
    ^

Can someone please help me understand what this means and how to translate  
it into code that is acceptable to Octave?

Cheers,
--
Regards,
Terry Duell