Re: select 1st column element based on criteria in 2nd column in mathematica
- To: mathgroup at smc.vnet.net
- Subject: [mg124167] Re: select 1st column element based on criteria in 2nd column in mathematica
- From: Fred Simons <f.h.simons at tue.nl>
- Date: Wed, 11 Jan 2012 06:01:25 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
Here are two ways: In[66]:= lst ={{1,3},{2,4},{3,6},{4,1},{5,3},{6,2},{7,5},{8,2}}; In[67]:= Select[lst, #[[2]]>3&][[All,1]] Out[67]= {2,3,7} In[68]:= Cases[lst, {x_,y_/;y>3}:>x] Out[68]= {2,3,7} Fred Simons Eindhoven University of Technology Op 11-1-2012 10:18, Hani schreef: > hello, I have a question. > > Suppose I have a table with two columns like this: > > 1 3 > 2 4 > 3 6 > 4 1 > 5 3 > 6 2 > 7 5 > 8 2 > > I want to select elements of the 1st column which its corresponding 2nd > column elements are bigger than 3. so, the result should be {2,3,7}. How to > implement that in mathematica? Thanx a lot > >