changing variables in syms
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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)?
采纳的回答
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.
4 个评论
Franco
2011-10-12
Walter Roberson
2011-10-12
I doubt that would output
c = I * (a * I)
as required by the poster. It would instead output
c = I^2 * a
or
c = a * I^2
It might even output
c = -a
Retaining bracketing in expressions of equal algebraic priority is tricky in symbolic engines, at least without visible constructs such as Mathematica's HOLD .
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
2011-10-12
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