SymEngine.jl

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We have seen this failed case ``` using SymEngine @vars x expr = (2*x+3*x^2)/(3*x+4*x^2) series(expr, x, 0, 1) ``` This gives zoo, but it obviously should be 2/3+(1/9)*x.

zhaoli-IHEP

not throw error but crash when assign an expression to array

2

environment: ``` Debian ⛬ julia/1.5.3+dfsg-3 [[SymEngine]] deps = ["Compat", "Libdl", "LinearAlgebra", "RecipesBase", "SpecialFunctions", "SymEngine_jll"] git-tree-sha1 = "6cf88a0b98c758a36e6e978a41e8a12f6f5cdacc" uuid = "123dc426-2d89-5057-bbad-38513e3affd8" version = "0.8.7" [[SymEngine_jll]] deps = ["Artifacts", "GMP_jll", "JLLWrappers", "Libdl",...

acsofie

Where is the documentation (API) ?

2

I can't find a proper documentation (aside the github repository redme) neither in SymEngine.jl neither in the symengine C++ repository..

sylvaticus

Hi! Found a bug (crashes terminal immediately) while working with SymEngine. Steps to reproduce: 1. Create file TestPolygon.jl 2. insert this code in TestPolygon: ``` using SymEngine x = symbols("x")...

PerformanceCoder

Here is a minimal example: ``` julia> Int64(9) < Basic("10") true ``` but: ``` julia> max(Basic(6.), 9) ERROR: MethodError: no method matching isless(::Int64, ::Basic) Closest candidates are: isless(::Union{Number, Dates.AbstractTime}, ::IntervalSets.ClosedInterval{T}...

chelseas

Is it possible to use something like 1-x:1:10-x

1

We were trying to calculate like `(1-x)*(2-x)*(3-x)*...*(10-x)`. And now we use `(1:10).-x`, which in fact gives in REPL `1 - x:1:10 - x`. However, it seems we cannot directly use...

zhaoli-IHEP

Array{SymEngine.Basic,1} dot product

1

Added linalgebra.jl which includes proper method(dispatch) for taking Array{SymEngine.Basic,1} (vector) dot product. The method is still bound to LinearAlgebra. This file can serve as a proper place to provide additional...

stefanbringuier

Hi! I've noticed that when computing the the `n`-th derivative in `x` of a function `f(x)` the number of allocations grows with `n`. This is expected for some general `f`...

lucass-carneiro

What is happening here? ``` julia> Basic(:(v_2 ≤ v_3)) ERROR: Base.Meta.ParseError("v_2 ≤ v_3") Stacktrace: [1] throw_if_error at /Users/Chelsea/.julia/packages/SymEngine/lLmHe/src/exceptions.jl:5 [inlined] [2] convert(::Type{Basic}, ::String) at /Users/Chelsea/.julia/packages/SymEngine/lLmHe/src/types.jl:51 [3] Basic at /Users/Chelsea/.julia/packages/SymEngine/lLmHe/src/types.jl:93 [inlined] [4]...

chelseas

How to substitute certain function?

6

For example ```julia @vars a b x y @funs f g ex1 = f(a,b) ex2 = subs( ex1, f(x_,y_), g(x_+y_) ) # maybe some wildcard for the arguments? ``` An...

zhaoli-IHEP