# User Portlet

Douglas Kubler
Discussions
Strange indeed the documentation says it should be: In[1]:= CityData["London", "Coordinates"] Out[1]= GeoPosition[{51.5, -0.116667}] But upon execution: In[1]:= CityData["London", "Coordinates"] Out[1]= {51.5,...
Douglas, > Consider this to be the genetic code, and for once and all we are > going to state how many possible codes there are! 64 bins for the > codons. 21 items, for the 20 amino acids plus one stop codon. Does Nature know left from right?...
You're missing a semicolon sol = Solve[x + y == 2 && x - y == 1, {x, y}]; x = x /. Flatten[sol]; y = y /. Flatten[sol] Undo the symbol damage with Clear["x"];Clear["y"]; Re-execute and your answers will be OK.
Nice work. I checked that *in situ* image modifications via the toolbar that appears when an image is clicked are undoable. The undo makes the workings of the "Actions & Tools" menu clumsy. I would prefer to remove the mini-preview of a...