Modified cross.m

[etienne grossmann]

  Hello,

  I propose to change the cross() function so that its usage be :

## usage:  cross (x, y)
##
## Computes the vector cross product of the two 3-dimensional vectors
## x and y.
##
## x and y may be Px3 (default) or 3xP. If x and y have same size, the
## result has same size as the arguments. If one argument is Px3 and the
## other 3xP, the size of the result will be Px3 unless if
## prefer_column_vectors is set.

  This differs from the current cross function by accepting multiple
vectors. Incidentaly, this is more like "matlab".
  
  I already have the code, and have been using it for a while.

  Etienne



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