close issue #359; tweak travis (#361)

* close issue #359; tweak travis

* test newer versions only

* tweak twice

.travis.yml

@@ -9,14 +9,11 @@ julia:
   - 1.3
   - 1.4
   - nightly
-git:
-    depth: 99999
+
 env:
     global:
     - PYTHON=conda
-    matrix:
-    - MPMATH=true
-    - MPMATH=false
+
 notifications:
   email: false
 
@@ -33,7 +30,6 @@ jobs:
         - GKSwstype="100"
       script:
         - julia --project=docs/ -e 'using Pkg; Pkg.instantiate();  Pkg.develop(PackageSpec(path=pwd()))'
-        - julia --project=docs/ docs/make.jl
       after_success: skip
 
 after_success:

Project.toml

@@ -1,6 +1,6 @@
 name = "SymPy"
 uuid = "24249f21-da20-56a4-8eb1-6a02cf4ae2e6"
-version = "1.0.26"
+version = "1.0.27"
 
 
 [deps]

src/matrix.jl

@@ -102,6 +102,8 @@ function LinearAlgebra.:\(A::AbstractArray{T,2}, B::AbstractArray{S,2}) where {T
     hcat([A \ bⱼ for bⱼ in eachcol(B)]...)
 end
 
+## Issue #359 so that A  +  λI is of type Sym
+Base.:+(A::AbstractMatrix{T}, I::UniformScaling) where {T <: SymbolicObject} = (n=LinearAlgebra.checksquare(A); A .+ I.λ*I(n))
 
 ##################################################
 ##

test/test-matrix.jl

@@ -138,4 +138,11 @@ using LinearAlgebra
                                                   sin(ϕ)  ρ*cos(ϕ)]
     @test X.jacobian(Y) == view(X, :, :).jacobian(view(Y, :, :))
 
+    ## Issue   #359
+    if VERSION >= v"1.2"
+        @vars a
+        @test eltype([a 1; 1 a] + I) == Sym
+        @test eltype([a 1; 1 a] + 2I) == Sym
+    end
+
 end