Python program errors -

-

i'm writing program needs find pairs of initial conditions (x0,y0) x goes extinct first , plot them.the equations are:

j=x-y+100 , i=x+y-100

and constraints (0,200) in both x , y directions.

my code looks this:

for x in range (0,201): y in range (0,201):     c=0     i=x     j=y while (x > 0 , y > 0):     i=x-y+100     j=x+y-100     c=c+1 if i==0:     plot(i,j) if c==50:     break

and error says:

    traceback (most recent call last):                i=x-y+100   file "", line 1, in <module>    file "/tmp/tmpqtzdaj/___code___.py", line 3, in <module>     exec compile(u'for x in range (_sage_const_0 ,_sage_const_201 ):\n    y in range (_sage_const_0 ,_sage_const_201 ):\n        c=_sage_const_0 \n        i=x\n        j=y\n        while (x > _sage_const_0  , y > _sage_const_0 ):\n            i=x-y+_sage_const_100 \n            j=x+y-_sage_const_100 \n            c=c+_sage_const_1 \n        if i==_sage_const_0 :\n            plot([i],[j])\n        if c==_sage_const_50 :\n            break   file "", line 11, in <module>    file "/app/sage/sage-6.1.1/local/lib/python2.7/site-packages/sage/misc/decorators.py", line 692, in wrapper     return func(*args, **kwds)   file "/app/sage/sage-6.1.1/local/lib/python2.7/site-packages/sage/misc/decorators.py", line 537, in wrapper     return func(*args, **options)   file "/app/sage/sage-6.1.1/local/lib/python2.7/site-packages/sage/plot/plot.py", line 1134, in plot     g = _plot(funcs, *args, **kwds)   file "/app/sage/sage-6.1.1/local/lib/python2.7/site-packages/sage/plot/plot.py", line 1236, in _plot     funcs, ranges = setup_for_eval_on_grid(funcs, [xrange], options['plot_points'])   file "/app/sage/sage-6.1.1/local/lib/python2.7/site-packages/sage/plot/misc.py", line 132, in setup_for_eval_on_grid     range_steps = [abs(range[1] - range[0])/(p-1) range, p in zip(ranges, plot_points)] indexerror: list index out of range

the problem passing integer plot() when expects array.

at point internally, tries length of array , fails because can't take length of integer.

at guess, code should like

max_reps = 50  good_pts = []  x in range (0,201):     y in range (0,201):         c in range(max_reps):             x, y = x - y + 100, x + y - 100              if y <= 0:                 break             elif x <= 0:                 good_pts.append((x, y))                 break

then plot (x, y) points in good_pts.


Comments

Post a Comment

Popular posts from this blog

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

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

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