don't constrain return values for mapped function

fixes #67

Project.toml

@@ -1,7 +1,7 @@
 name = "ExtendableGrids"
 uuid = "cfc395e8-590f-11e8-1f13-43a2532b2fa8"
 authors = ["Juergen Fuhrmann <[email protected]>", "Christian Merdon  <[email protected]>", "Johannes Taraz  <[email protected]>"]
-version = "1.10.3"
+version = "1.10.4"
 
 [deps]
 AbstractTrees = "1520ce14-60c1-5f80-bbc7-55ef81b5835c"

src/extendablegrid.jl

@@ -488,16 +488,13 @@ function Base.map(f::Function, grid::ExtendableGrid{Tc, Ti}) where {Tc,Ti}
     c1=coord[:,1]
     dim = dim_space(grid)
 
-    ## Check if f can be called with numeric args like f(x,y) and returns a number
+    ## Check if f can be called with number args like f(x,y)
     function checknumargs(f,args...)
 	if !hasmethod(f,Tuple(typeof.(args)))
 	    return false
 	end
 	try 
 	    y=f(args...)
-            if !isa(y,Number)
-                return false
-            end
 	catch e
 	    if isa(e,MethodError) 
 		return false
@@ -517,9 +514,6 @@ function Base.map(f::Function, grid::ExtendableGrid{Tc, Ti}) where {Tc,Ti}
 	end
 	try 
 	    y=f(v)
-            if !isa(y,Number)
-                return false
-            end
 	catch e
 	    if isa(e,MethodError) 
 		return false

test/runtests.jl

@@ -187,6 +187,14 @@ end
     @test map(fx,gx)==map(fv,gx)
     @test map(fxy,gxy)==map(fv,gxy)
     @test map(fxyz,gxyz)==map(fv,gxyz)    
+
+    vfx(x)=[x]
+    vfxy(x,y)=[x,y]
+    vfxyz(x,y,z)=[x,y,z]
+    vfv(v)=v
+    @test map(vfx,gx)==map(x->[vfv(x)],gx)
+    @test map(vfxy,gxy)==map(vfv,gxy)
+    @test map(vfxyz,gxyz)==map(vfv,gxyz)    
 end
 
 function testrw(grid, format; confidence = :full, kwargs...)