changing variables in syms

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Franco
Franco 2011-10-12
If I am working in syms and I say
c= I * (a * I + b * J)
How do I tell matlab that I want I * J = 0 so that it outputs
c = I * (a * I)?

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Sean de Wolski
Sean de Wolski 2011-10-12
subs(c,'J',0)
since J or I has to be zero in the substitution and you want I retained.
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Walter Roberson
Walter Roberson 2011-10-12
Franco, I * J does not express dot product. MuPad expresses dot product via the MuPad routine linalg::scalarProduct (which is not exposed at the MATLAB level.)
If you are using the Maple based symbolic engine, then Maple's dot product operator is . (period), as in maple('A . B')
Franco
Franco 2011-10-12
thanks Walter.

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