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Student Support Forum > General > > "Extract numbers from list"

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Please answer this:3+1 =



Original Message (ID '79439') By Peter Pein:
Hi, there are several ways to achieve this. Here are some of them: In[1]:= mylist = {{x, y}, {c, v}}; In[2]:= mylist[[All, 1]] Out[2]= {x, c} In[3]:= First[Transpose[mylist]] Out[3]= {x, c} In[4]:= First /@ mylist Out[4]= {x, c} In[5]:= mylist /. {a_?AtomQ, ___} :> a Out[5]= {x, c} Peter