[?] Add number to list element?

Questions
1

I have the following problem:

I define a list of complex numbers. When I try to add a number to a single list element, it fails. But why?

9489Unbenannt.jpg
9489Unbenannt.jpg401×193 19.3 KB

Does anybody have an idea what’s wrong?

Thanks,
Ben

2

In[1]:= uu = 2;

In[2]:= helper = Table[RandomComplex[], {2}, {3}]
    
Out[2]= {
         {0.671075 + 0.123629 I, 0.732442 + 0.287433 I, 0.447885 + 0.727767 I}, 
         {0.440247 + 0.57757 I, 0.33895 + 0.468506 I,0.871482 + 0.113165 I}
        }
    
In[3]:= 1 + helper
    
Out[3]= {
         {1.67107 + 0.123629 I, 1.73244 + 0.287433 I, 1.44788 + 0.727767 I}, 
         {1.44025 + 0.57757 I, 1.33895 + 0.468506 I, 1.87148 + 0.113165 I}
        }
    
In[4]:= 1 + helper[[uu, 3]]
    
Out[4]= 1.87148 + 0.113165 I