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I have three positive variables, x, y and z, subject to the constraint x+y+z=1. My understanding is that because of the constraint, the partial derivative of any of the three variables with respect to another is 1, i.e. dy/dx=dy/dz=dx/dy=dx/dz=dz/dy=dz/dx=1. Does anyone know how to define this system of variables and the constraint in MATLAB so that the partial derivatives are all evaluated as 1? 
On 26/12/10 8:44 PM, Dean wrote: 
Walter Roberson <roberson@hushmail.com> wrote in message <qoTRo.3509$z06.701@newsfe08.iad>... 
"Dean " <dchesterfield@hotmail.com> wrote in message <ifb8ef$s22$1@fred.mathworks.com>... 
On 27/12/10 5:45 PM, Dean wrote: 
Walter Roberson <roberson@hushmail.com> wrote in message <1jbSo.13458$2G7.2261@newsfe13.iad>... 
On 28/12/10 1:23 AM, Dean wrote: 
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