python - Selecting rows with similar index names in Pandas -

-

lets have pandas dataframe of following form:

      b  c a_1  1  4  2 a_2  3  3  5 a_3  4  7  2 b_1  2  9  8 b_2  7  2  6 b_3  5  4  1 c_1  3  1  3 c_2  8  6  6 c_3  9  3  7

is there way select rows have similar names? in case of dataframe above mean selecting rows start a, or rows start b, etc.

using @akavall setup code

df = pd.dataframe(data = my_data, index=['a_1', 'a_2', 'b_1', 'b_2'], columns=['a', 'b'])  in [1]: my_data = np.arange(8).reshape(4,2)  in [2]: my_data[0,0] = 4  in [3]: df = pd.dataframe(data = my_data, index=['a_1', 'a_2', 'b_1', 'b_2'], columns=['a', 'b'])  in [5]: df.filter(regex='a',axis=0) out[5]:        b a_1  4  1 a_2  2  3  [2 rows x 2 columns]

note in general better posed multi-index

in [6]: df.index = multiindex.from_product([['a','b'],[1,2]])  in [7]: df out[7]:        b 1  4  1   2  2  3 b 1  4  5   2  6  7  [4 rows x 2 columns]  in [8]: df.loc['a'] out[8]:      b 1  4  1 2  2  3  [2 rows x 2 columns]  in [9]: df.loc[['a']] out[9]:        b 1  4  1   2  2  3  [2 rows x 2 columns]

Comments

Post a Comment

Popular posts from this blog

c# - Unity IoC Lifetime per HttpRequest for UserStore -

-
i'm trying clean default implementation of accountcontroller.cs comes out of box in new mvc5/owin security implementation. have modified constructor this: private usermanager<applicationuser> usermanager; public accountcontroller(usermanager<applicationuser> usermanager) { this.usermanager = usermanager; } also, have created lifetime manager unity looks this: public class httpcontextlifetimemanager<t> : lifetimemanager, idisposable { private httpcontextbase _context = null; public httpcontextlifetimemanager() { _context = new httpcontextwrapper(httpcontext.current); } public httpcontextlifetimemanager(httpcontextbase context) { if (context == null) throw new argumentnullexception("context"); _context = context; } public void dispose() { this.removevalue(); } public override object get...
Read more

Change the color of an oval at click in Java AWT -

-
i have draw ovals in java, , @ click change color. beginning tried change color after 20 ms, doesn't work. my code is: public class mycomponentnew extends frame { public graphics2d g2d; public mycomponentnew(string title) { super(title); setsize(400, 550); } @override public void paint(graphics g) { this.g2d = (graphics2d) g; this.g2d.setcolor(color.red); this.g2d.filloval(10, 55, 50, 100); } public void changecolor () { this.g2d.setcolor(color.blue); this.g2d.filloval(10, 55, 50, 100); } } and in class main method have: mycomponentnew m; m = new mycomponentnew("fereastra cu baloane"); m.setvisible(true); m.addwindowlistener(new windowadapter() { @override public void windowclosing(windowevent we) { system.exit(0); } }); try { thread.sleep(20); } catch(interruptedexception e) {} m.changecolor(); the color of oval remains red. ...
Read more

I am trying to solve the error message 'incompatible ranks 0 and 1 in assignment' in a fortran 95 program. -

-
i writing program in fortran find velocity of parachuting person in relation time. keep getting error can't fix. new programming , appreciated. the error is v(i+1)=v(i)+[32-((c*v(i)*v(i))/m)]*(h) 1 error: incompatible ranks 0 , 1 in assignment @ (1) and program is program para integer :: real :: v(11) !velocity real :: q !initial velocity real :: h !time step real :: c !drag coefficient real :: m !mass ! gravity equal 32 ft/s^2 write (*,*)'enter time step' read(*,*)h write(*,*)'enter initial velocity' read(*,*)q write(*,*)'enter drag coefficient' read(*,*)c write(*,*)'enter mass' read(*,*)m i=1,10 ! 1 10, 1 being interval. end v(i+1)=v(i)+[32-((c*v(i)*v(i))/m)]*(h) q=v(1) end program you cannot use [] normal parenthesis in expressions. array constructor, [ items ] means array items elements. end do should after line.
Read more