From help-octave-request at bevo dot che dot wisc dot edu Fri Mar  5 14:23:47 2004
Subject: Re: Problems translating .m to .oct
From: Al Niessner <Al dot Niessner at jpl dot nasa dot gov>
To: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
Cc: Octave Help <help-octave at bevo dot che dot wisc dot edu>
Date: Fri, 05 Mar 2004 12:14:18 -0800


Thank you. That is what I have been looking for.

On Fri, 2004-03-05 at 11:37, John W. Eaton wrote:
> On  5-Mar-2004, Al Niessner <Al dot Niessner at jpl dot nasa dot gov> wrote:
> 
> | I am translating a working 'm' file into a compiled version and cannot
> | figure out how to multiply two ColumnVectors element wise. Here is an
> | example of the octave syntax (m file) and reduced C++ code:
> | 
> |  m-file                              C++
> |  ------                              ---
> | a = someMatrix(:,1);        ColumnVector a(someMatrix.column(0));
> | b = someMatrix(:,2);        ColumnVector b(someMatrix.column(1));
> | c = someMatrix(:,3);        ColumnVector c(someMatrix.column(2));
> |                             ColumnVector d;
> | d = a .* (b + c);           d = a * (b + c);
> | 
> | I then get the ambiguous operator "*" error where it can find
> | RowVector, ColumnVector -> double
> | ColumnVector, RowVector -> Matrix
> | octave_value, octave_value -> octave_value
> | 
> | So, what is the correct C++ syntax for this operation? Should I be using
> | the last and then extracting the column vector from it?
> 
> I think you want
> 
>   ColumnVector d = product (a, b+c);
> 
> jwe
-- 
Al Niessner <Al dot Niessner at jpl dot nasa dot gov>
Jet Propulsion Laboratory

All opinions stated above are mine and do not necessarily reflect 
those of JPL or NASA.

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