Re: setdiff: Octave <-> Matlab

[Mike Miller]

On Tue, 14 Jun 2005, John W. Eaton wrote:

> On 14-Jun-2005, address@hidden wrote:
>
> | I am tying to use the setdiff command in octave.  I am trying to get a
> | script that works in Matlab to work in octave.  In matlab the syntax
> | is:
> |
> | c = setdiff(A, B, 'rows'), when A and B are matrices with the same
> | number of columns, returns the rows from A that are not in B.
> |
> | in octave the syntax is similar, but it does not take the rows
> | option.  Not knowing exactly how Matlab works(I do not have a working
> | copy) I do not know how to get they same output in octave.  Can
> | someone help who has a copy of Matlab??
>
> Why should that be necessary?  If you want to implement something for 
> Octave, then you must not refer to Matlab M-files.  You know what the 
> function is supposed to do, so the task is to make an independent 
> implementation.

I think he does not know what the function is supposed to do because he 
doesn't understand the 'rows' argument.

Sometimes a simple google search can help because MATLAB docs are on the 
web:

http://taxa.epi.umn.edu/bgnews/2003/msg00074.html

c = setdiff(A, B)  returns the values in A that are not in B. The 
resulting vector is sorted in ascending order. In set theory terms, c = A 
- B. A and B can be cell arrays of strings.

c = setdiff(A, B, 'rows'), when A and B are matrices with the same number 
of columns, returns the rows from A that are not in B.

Mike



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