Made script, but when I try to execute terminal opens and closes
Discuss Made script, but when I try to execute terminal opens and closes in the Python Programming forum on Dev Shed. Made script, but when I try to execute terminal opens and closes Python Programming forum discussing coding techniques, tips and tricks, and Zope related information. Python was designed from the ground up to be a completely object-oriented programming language.
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Yes.
Maybe this program will give you the insight you need to continue as a python programmer. Your program is "right but backward". It's like looking at a magnetic compass and misunderstanding which of the two ends of the bar magnet points north. Instead of heading east you proceed west. As numerical methods go, you have to work harder to obtain good roots. Suppose the coefficient a is tiny and the parabola sinks just below y=0. Slight changes in the coefficients cause big changes to the roots. Try to picture the situation I described.
Oh, except for the backslashes at the line ends. NEVER use backslashes at the end of a line of python. You can always find a better way to continue a statement onto (the
next line.)
Code:
#!/usr/bin/env python
a = float(input("a=? ")) # assign to variable a the value from keyboard
b = float(input("b=? "))
c = float(input("c=? "))
import cmath,math
discriminant = b * b - 4 * a * c
if discriminant < 0:
q = cmath.sqrt(discriminant)
else:
q = math.sqrt(discriminant)
# more simply, q = discriminant**0.5
xb = (-b + q) / 2
xe = (-b - q) / 2
print('roots:')
print('\t',xb)
print('\t',xe)
Posts: 7
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Quote:
Originally Posted by b49P23TIvg
Maybe this program will give you the insight you need to continue as a python programmer. Your program is "right but backward". It's like looking at a magnetic compass and misunderstanding which of the two ends of the bar magnet points north. Instead of heading east you proceed west. As numerical methods go, you have to work harder to obtain good roots. Suppose the coefficient a is tiny and the parabola sinks just below y=0. Slight changes in the coefficients cause big changes to the roots. Try to picture the situation I described.
Oh, except for the backslashes at the line ends. NEVER use backslashes at the end of a line of python. You can always find a better way to continue a statement onto (the
next line.)
Code:
#!/usr/bin/env python
a = float(input("a=? ")) # assign to variable a the value from keyboard
b = float(input("b=? "))
c = float(input("c=? "))
import cmath,math
discriminant = b * b - 4 * a * c
if discriminant < 0:
q = cmath.sqrt(discriminant)
else:
q = math.sqrt(discriminant)
# more simply, q = discriminant**0.5
xb = (-b + q) / 2
xe = (-b - q) / 2
print('roots:')
print('\t',xb)
print('\t',xe)
Ooh yea lots better, however
multiplying discriminant by 0,5 and then divide it by 2, isnt that double?
Posts: 1,075
Time spent in forums: 4 Weeks 1 Day 4 h 41 m 27 sec
Reputation Power: 98
oh---you're using a microsoft product. I think there's some sort of preference setting that keeps the console window open. Or you can run your code in idle (See www.python.org if you don't know about idle.) I usually run my programs in an emacs shell buffer. (xemacs might work better on microsoft windows system.)
Posts: 7
Time spent in forums: 1 h 41 m 46 sec
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Quote:
Originally Posted by b49P23TIvg
oh---you're using a microsoft product. I think there's some sort of preference setting that keeps the console window open. Or you can run your code in idle (See (site i cant quote) if you don't know about idle.) I usually run my programs in an emacs shell buffer. (xemacs might work better on microsoft windows system.)
No not really, actually im using Ubuntu 11.10 and I'm running this program in Ubuntu's terminal.
But since I added the sleep command it doesnt exit anymore.
Currently busy searching for a way to restart the program.
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