From bug-request at octave dot org Thu Mar 16 10:42:30 2006
Subject: Re: hurst.m
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: Francesco Potorti` <Potorti at isti dot cnr dot it>
Cc: Octave bugs list <bug-octave at bevo dot che dot wisc dot edu>
Date: Thu, 16 Mar 2006 11:42:13 -0500

On 16-Mar-2006, Francesco Potorti` wrote:

| >| The following expressions index a as if it were a column vector. If the 
| >| indexing expression is a vector, the dimensions of the output will match 
| >| those of the vector:
| >| a(1:2)
| >| a(:)
| >| a([1;2])
| >
| >When I read this, I'm not sure whether the last "vector" is intended
| >to refer to the object that is indexed, or the index vector.
| 
| Let's try again.  Instead of the current text:
| 
|  Vectors are indexed using a single expression.  Matrices may be indexed
|  using one or two indices (a warning is issued if a single index is used
|  unless the value of the built-in variable `warn_fortran_indexing' is
|  zero).
| 
| Use this one:
| 
|  Vectors are indexed using a single index expression.  Matrices may be
|  indexed using one or two indices.  When using a single index
|  expression, the elements of the matrix are taken in column-first order;
|  the dimensions of the output match those of the index expression:
|     A(2)				# a scalar
|     A(1:2)      			# a row vector
|     A([1;2])    			# a column vector
| 
|  As a special case, when a colon is used as a single index, the output
|  is a column vector containing all the elements of A:
|     A(:)	    			# a column vector
| 
|  A warning is issued when using a single expression to index a matrix,
|  unless the value of the built-in variable `warn_fortran_indexing' is
|  zero.

I made these changes to the manual.

Thanks,

jwe



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