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Expression differentiation with constants #15

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tmamedzadeh opened this issue Jul 25, 2018 · 3 comments
Closed

Expression differentiation with constants #15

tmamedzadeh opened this issue Jul 25, 2018 · 3 comments
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@tmamedzadeh
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Is it possible to differentiate and expression C*(x+y) by x, showing that C is a constant?
@chakravala
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Do you mean like this?

julia> using Reduce
Reduce (Free CSL version, revision 4590), 11-May-18 ...

julia> Algebra.df( :(c*(x+y)), :x)
:c

note that REDUCE is not set to be case sensitive, so C will be returned as c.

@tmamedzadeh
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How did it recognize that c is constant but y is variable?

@chakravala
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It is treated as partial differentiation, i.e. x is declared as the variable and the others are treated constant.

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@tmamedzadeh @chakravala