From bug-octave-request at bevo dot che dot wisc dot edu  Fri Nov 17 17:23:06 2000
Subject: RE: 'end' keyword
From: "Julian A. de Marchi, Ph.D" <julian at matlinks dot net>
To: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>, <tene@fatkat.com>
Cc: <bug-octave at bevo dot che dot wisc dot edu>
Date: Fri, 17 Nov 2000 18:23:03 -0500

Try

end_=length(a);
b=a(3:end_);

boring, but cross-compatible.


-----Original Message-----
From: bug-octave-request at bevo dot che dot wisc dot edu
[mailto:bug-octave-request at bevo dot che dot wisc dot edu]On Behalf Of John W. Eaton
Sent: Friday, November 17, 2000 3:27 PM
To: tene at fatkat dot com
Cc: bug-octave at bevo dot che dot wisc dot edu
Subject: 'end' keyword


On 17-Nov-2000, Eric Tenenbaum <tene at fatkat dot com> wrote:

| 	   Although octave does not claim to be 100% compatible with
| Matlab M-files I do have a question/request about the 'end' keyword.
| Below I show a use of this keyword in both environments.  Is it
| possible to add the 'end' keyword to make its use compatible with
| Matlab?  And if you have no plans to do so could you give me a few
| pointers into the code where I might try my hand at the task?
| 
| Thanx
| ERIC
| 
| tene at fatkat dot com
| 
| 
| *************************************************************************
| Mahtworks matlab
| 
| >> a=1:5  
| 
| a =
| 
|      1     2     3     4     5
| 
| >> b=a(3:end)
| 
| b =
| 
|      3     4     5
| *************************************************************************
| 
| 
| *************************************************************************
| Octave version  GNU Octave, version 2.1.31 (alphaev6-unknown-linux-gnu).
| octave:5> a=1:5  
| a =
| 
|   1  2  3  4  5
| 
| octave:6> b=a(3:end)
| parse error:
| 
| >>> b=a(3:end)
| 
| *************************************************************************

I have no plans to do this myself.

If you want to try, you'll probably have to modify the parse to
distinguish this type of end token from the current type of end
token, and then build something similar to what is used to handle the
colon operator (the one for indexing entire rows or columns, not for
building Range objects).  Range objects will have to be extended to
store this new token too.  Then you'll need to modify the idx-vector
classes to turn this special token into an actual number.  The
Array-idx and and Array2-idx classes may have to be changed to
pass extra informaion to the idx-vector constructors.

Unless you see a better way.

jwe



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Octave is freely available under the terms of the GNU GPL.

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