added auxiliary functions for juobs.corr

src/juobs_linalg.jl

@@ -835,9 +835,24 @@ end
 function Base.length(uw::uwreal)
     return length(value(uw))
 end
+
+Base.length(c::juobs.Corr) = 1
+
 function Base.iterate(uw::uwreal)
     return iterate(uw, 1)
 end
+
+function Base.iterate(c::juobs.Corr,state::Int64)
+    if state >length(c)
+        return nothing
+    else
+        return c[state], state+1
+    end
+end
+        
+Base.iterate(c::juobs.Corr) = iterate(c,1)
+
+
 function Base.iterate(uw::uwreal, state::Int64)
     if state > length(uw)
         return nothing
@@ -855,11 +870,20 @@ function Base.iterate(uw::Vector{uwreal}, state::Int64)
         return uw[state], state +1
     end
 end
-function Base.getindex(uw::uwreal, ii::Int64)
-    idx = getindex(value(uw), ii)
+function Base.getindex(uw::uwreal, ii)
+    if ii>length(uw) || ii<=0
+        throw(BoundsError(uw,[ii]))
+    end
     return  uw # uwreal([getindex(value(uw), kwargs...), err(uw)], " ")
 end
 
+function Base.getindex(c::juobs.Corr, ii)
+    if ii>length(c) || ii<=0
+        throw(BoundsError(c,[ii]))
+    end
+    return c
+end
+
 """
     Base.abs2(uw::uwreal)