Segfault converting equations about symengine.jl

[jverzani]

• I think you would need to define your own equation type within Julia for this. There would be no hope of using = to define an equation, but you could use some Unicode operation if you wanted. As far as I know, SymEngine doesn't have facilities for solving equations at this point.

• as for symbolic derivatives, you have SymFunction objects, so maybe you are looking for something like:

@vars x
F = SymFunction("F")
diff(F(x), x)

[mforets]

Thank you. Yes, SymFunction and the Derivative(F(x), x) is what i was looking for 😄

For ODEs and assignments i don't really need SymEngine to solve them, just to represent them and maybe ask for values of some coefficients, to take derivatives, etc. But as you suggest, a custom type may do the trick.

[mforets]

Closing as the issue was answered by @jverzani's comment. Moreover, with the current version one gets an error message instead of a segfault (which is way better):

julia> convert(Basic, :(y = x+1)) # error
ERROR: Base.Meta.ParseError("y = x + 1")
Stacktrace:
 [1] throw_if_error at /Users/mforets/.julia/packages/SymEngine/zSUGO/src/exceptions.jl:5 [inlined]
 [2] convert(::Type{Basic}, ::String) at /Users/mforets/.julia/packages/SymEngine/zSUGO/src/types.jl:51
 [3] Type at /Users/mforets/.julia/packages/SymEngine/zSUGO/src/types.jl:93 [inlined]
 [4] convert(::Type{Basic}, ::Expr) at /Users/mforets/.julia/packages/SymEngine/zSUGO/src/types.jl:57
 [5] top-level scope at REPL[11]:1