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From: andrea on 7 Jul 2010 06:10
Hi,

I have a vector, V, and an array, A.
Which function in MATLAB running the cross product between a vector and an array?
I saw the function cross but its in input accept two vectors with equal size.


Thanks for all

Andrea
From: James Tursa on 7 Jul 2010 06:21
"andrea " <nacchio1983(a)yahoo.it> wrote in message <i11jpt$pho$1(a)fred.mathworks.com>...
>
> I have a vector, V, and an array, A.
> Which function in MATLAB running the cross product between a vector and an array?
> I saw the function cross but its in input accept two vectors with equal size.

Do you mean something like this, column by column?

bsxfun(@cross,V,A)

James Tursa
From: Matt J on 7 Jul 2010 08:41
"andrea " <nacchio1983(a)yahoo.it> wrote in message <i11jpt$pho$1(a)fred.mathworks.com>...
> Hi,
>
> I have a vector, V, and an array, A.
> Which function in MATLAB running the cross product between a vector and an array?
> I saw the function cross but its in input accept two vectors with equal size.


You could also do as follows


xprodmat(V)*A; %Column-by-column cross product of V with A


function A=xprodmat(a)
%Matrix representation of a cross product
%
% A=xprodmat(a)
%
%in:
%
% a: 3D vector
%
%out:
%
% A: a matrix such that A*b=cross(a,b)


if length(a)<3, error 'Input must be a vector of length 3'; end

ax=a(1);
ay=a(2);
az=a(3);

A=zeros(3);

A(2,1)=az; A(1,2)=-az;
A(3,1)=-ay; A(1,3)=ay;
A(3,2)=ax; A(2,3)=-ax;
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