Simplify expression with symbolics.jl

General Usage
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1

Why is the following expression not getting simplified?

julia> using Symbolics
julia> @variables a, b
julia> expr=2.25e-7(2.701832006722774e6a - 1.0131921447234855e6(b + 7.999959398007795a))

julia> simplify(expr)
2.25e-7(2.701832006722774e6a - 1.0131921447234855e6(b + 7.999959398007795a))
2

I’m not sure if “simplify” is always well-defined, but I just assume that you want the parentheses expanded and the factors of a and b grouped together?

simplify has a keyword expand for that:

julia> using Symbolics

julia> @variables a, b;

julia> expr = 2(3a - 4(b + 5a))
2(3a - 4(b + 5a))

julia> simplify(expr)
2(3a - 4(b + 5a))

julia> simplify(expr; expand=true)
-8b - 34a
1 Like
3

Indeed, that works:

julia> simplify(expr; expand=true)
-0.22796823256278423b - 1.215824403025248a

Thank you!

1 Like