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Commit bc497e19 authored by cprutean's avatar cprutean
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Update 8 files 

- /CodeExamples/RootTwo.ipynb
- /CodeExamples/SortFunction.ipynb
- /CodeExamples/SphereVolume.ipynb
- /CodeExamples/TemperatureConverter.ipynb
- /CodeExamples/ThreeWayConditional.ipynb
- /CodeExamples/TwoWayConditional.ipynb
- /CodeExamples/WhileLooptoList.ipynb
- /CodeExamples/WriteFile.ipynb
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CodeExamples/RootTwo.ipynb
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View file @ bc497e19
%% Cell type:markdown id:46844364 tags:
# Cos Plot
%% Cell type:code id:a64ddd0e tags:
``` python
"""
Simple demo to show that test on float numbers is a VERY bad idea.
It also inclues the correct way to do this.
Try with 2.0 and 4.0 and a random set of others and see what happens.
(then don't put this is a program)
(then don't put this in a program)
"""
import math
def main():
# make
x = float(input("Value : "))
y = math.sqrt(x)**2
if y == x:
print("math.sqrt({0:4.2f})**2 = {0:4.2} so maths works".format(x))
else:
print("math.sqrt({0:4.2f})**2 != {0:4.2} so maths fails".format(x))
delta = y - x
print("Difference between the numbers is : " + str(delta))
# Here this the correct way to do this with the math.isclose() function.
# this ONLY works on Python 3.5 or newer
if math.isclose(x,y):
print("The math.isclose() test works")
else:
print("The math.isclose() test fails")
# Execute the program
main()
# Read a number
x = float(input("Value : "))
y = math.sqrt(x)**2
if y == x:
print("math.sqrt({0:4.2f})**2 = {0:4.2} so maths works".format(x))
else:
print("math.sqrt({0:4.2f})**2 != {0:4.2} so maths fails".format(x))
delta = y - x
print("Difference between the numbers is : " + str(delta))
# Here is the correct way to do this with the math.isclose() function.
# this ONLY works in Python 3.5 or newer
if math.isclose(x,y):
print("The math.isclose() test works")
else:
print("The math.isclose() test fails")
```
......
CodeExamples/SortFunction.ipynb
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− 12
View file @ bc497e19
%% Cell type:markdown id:8d28d211 tags:
# Sort Function
%% Cell type:code id:fc4d5a05 tags:
``` python
""""
Example to demonstrate changing a list inside a function
"""
def sortit(ls):
ls.sort()
return ls
def main():
vals = [2,9,1,5,6,3,0]
nl = sortit(vals)
print(str(vals))
print(str(nl))
vals.append(99)
print(str(vals))
print(str(nl))
main()
vals = [2,9,1,5,6,3,0]
nl = sortit(vals)
print(str(vals))
print(str(nl))
vals.append(99)
print(str(vals))
print(str(nl))
```
......
CodeExamples/SphereVolume.ipynb
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− 4
View file @ bc497e19
%% Cell type:markdown id:227f88f0 tags:
# Sphere Volume
%% Cell type:code id:695f4dd5 tags:
``` python
"""
Program to estimate the volume of a sphere by counting the
number of random points that fall inside compared with the
number of points in a box round the sphere.
"""
import math
import random
def random_point(max_range):
"""
Return a random 3d point in range +/max_range
"""
x = random.uniform(-max_range,max_range)
y = random.uniform(-max_range,max_range)
z = random.uniform(-max_range,max_range)
return x,y,z
def point_in_sphere(radius,x,y,z):
"""
Check if a point is within a sphere specified.
"""
if x*x + y*y + z*z <= radius*radius:
return True
else :
return False
def main():
"""
Main program
"""
points = int(input("Number of points : ")) # Ask for initial conditions
radius = float(input("Radius of sphere : "))
# Counters for number inside and look variable
# Counters for number inside and look variable
inside, p = 0 , 0
while p <= points: # Loop over number of trial points
x,y,z = random_point(radius) # Random point in cube round sphere
if point_in_sphere(radius,x,y,z) : # Is it inside, if so count it
inside += 1
p += 1
# Estimated volume is given by ratio of number of points inside
# times volume of cube round sphere
#
# Estimated volume is given by ratio of number of points inside
# times volume of cube round sphere
estimate = float(inside)/float(points)*math.pow(2*radius,3)
vol = 4.0*math.pi*math.pow(radius,3)/3.0
print("Estimate volume is : " + str(estimate) + " real volume is : " + str(vol))
main()
```
......
CodeExamples/TemperatureConverter.ipynb
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View file @ bc497e19
%% Cell type:markdown id:74c83032 tags:
# Temperature Converter
%% Cell type:code id:e7d790d3 tags:
``` python
"""
Simple converter between Fahrenheit and centigrade using functions
Simple converter between Fahrenheit and Celsius degrees using functions
"""
def fahrenheit(t):
"""
Convert centigrade to fahrenheit
Convert Celsius to Fahrenheit
"""
return 1.8*t + 32
def centegrade(t):
def celsius(t):
"""
Convert fahrenheith to centegrade
Convert Fahrenheit to Celsius
"""
return (t - 32.0)/1.8
def main(): # Main program
# Main program
freezing = 0.0
boiling = 100.0
freezing = 0.0
boiling = 100.0
print("Water freezes as : " + str(freezing) + " C or " + str(fahrenheit(freezing)) + " F")
print("Water boils as : " + str(boiling) + " C or " + str(fahrenheit(boiling)) + " F")
print("Water freezes as : " + str(freezing) + " C or " + str(fahrenheit(freezing)) + " F")
print("Water boils as : " + str(boiling) + " C or " + str(fahrenheit(boiling)) + " F")
normalbody = 98.6
deathvalley = 134.0
normalbody = 98.6
deathvalley = 134.0
print("Normal body temperature is : " + str(normalbody) + " F or " + str(centegrade(normalbody)) + " C")
print("Death Valley record is : " + str(deathvalley) + " F or " + str(centegrade(deathvalley)) + " C")
main()
print("Normal body temperature is : " + str(normalbody) + " F or " + str(celsius(normalbody)) + " C")
print("Death Valley record is : " + str(deathvalley) + " F or " + str(celsius(deathvalley)) + " C")
```
......
CodeExamples/ThreeWayConditional.ipynb
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View file @ bc497e19
%% Cell type:markdown id:e477673e tags:
# Three Way Conditional
%% Cell type:code id:d0274b5d tags:
``` python
"""
Three way conditional example
"""
import math
def main():
a = float(input("Give a float : "))
if a > 4.0 :
# Inside if
b = 4.0 - math.sqrt(a)
a = 2.0*(b - 3.0)
print("if statements executed")
elif a > 0 :
# Inside else is
b = 1.0 + math.sqrt(a)
a = (b - 1.0)
print("elif statements executed")
else :
# Inside else
b = 4.0 - 3.0*math.sqrt(-a)
a = 7.0*(b - 3.0)
print("else statements executed")
a = float(input("Give a float : "))
# Outside conditional
print("The value of a is : " + str(a) + " and b is : " + str(b))
if a > 4.0 :
# Inside if
b = 4.0 - math.sqrt(a)
a = 2.0*(b - 3.0)
print("if statements executed")
elif a > 0 :
# Inside else is
b = 1.0 + math.sqrt(a)
a = (b - 1.0)
print("elif statements executed")
else :
# Inside else
b = 4.0 - 3.0*math.sqrt(-a)
a = 7.0*(b - 3.0)
print("else statements executed")
main()
# Outside conditional
print("The value of a is : " + str(a) + " and b is : " + str(b))
```
......
CodeExamples/TwoWayConditional.ipynb
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View file @ bc497e19
%% Cell type:markdown id:05cd9aca tags:
# Two Way Conditional
%% Cell type:code id:615a5d55 tags:
``` python
"""
A Two way conditional example
"""
def main():
a = int(input("Give an integer : "))
a = int(input("Give an integer : "))
if a < 10 :
# Inside true of conditional
print("The integer you gave was less that 10, give a bigger one.")
a = int(input("Give a bigger integer : "))
else:
# Inside false of conditional
print("The integer you gave was big enough.")
if a < 10 :
# Inside true of conditional
print("The integer you gave was less that 10, give a bigger one.")
a = int(input("Give a bigger integer : "))
else:
# Inside false of conditional
print("The integer you gave was big enough.")
# Outside conditional
print ("The integer you gave was : " + str(a))
main()
# Outside conditional
print ("The integer you gave was : " + str(a))
```
......
CodeExamples/WhileLooptoList.ipynb
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View file @ bc497e19
%% Cell type:markdown id:15c99cef tags:
# While Loop to List
%% Cell type:code id:a90d92d5 tags:
``` python
"""
Example to demonstrate a while loop to write theta and cos theta
to a list
"""
import math
def main():
n_point = 50
delta_theta = 2.0*math.pi/n_point # theta increment
theta = 0.0 # theta start
theta_data = [] # empty list
cos_data = [] # empty list
while theta < 2.0*math.pi: # while loop
cos = math.cos(theta)
theta_data.append(theta) # Add values to list
cos_data.append(cos)
theta += delta_theta # increment theta
# Do a default print (not very tidy output, replace this and
# a loop and make it nicer)
print(str(theta_data))
print(str(cos_data))
main()
n_point = 50
delta_theta = 2.0*math.pi/n_point # theta increment
theta = 0.0 # theta start
theta_data = [] # empty list
cos_data = [] # empty list
while theta < 2.0*math.pi: # while loop
cos = math.cos(theta)
theta_data.append(theta) # Add values to list
cos_data.append(cos)
theta += delta_theta # increment theta
# Do a default print (not very tidy output, replace this and
# a loop and make it nicer)
print(str(theta_data))
print(str(cos_data))
```
......
CodeExamples/WriteFile.ipynb
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− 19
View file @ bc497e19
%% Cell type:markdown id:fa29e737 tags:
# Write File
%% Cell type:code id:2812565f tags:
``` python
"""
Example to open and write text strings, (and add a bit of culture)
"""
def main():
fileout = open("burns.txt","w")
fileout = open("burns.txt","w")
fileout.write("When chapman billies leave the street,\n")
fileout.write("And drouthy neebors, neebors meet,\n")
fileout.write("As market-days are wearing late,\n")
fileout.write("An' folk begin to tak the gate;\n")
fileout.write("While we sit bousing at the nappy,\n")
fileout.write("And getting fou and unco' happy,\n")
fileout.write("We think na on the lang Scots miles,\n")
fileout.write("The mosses, waters, slaps and styles,\n")
fileout.write("That lie between us and our hame,\n")
fileout.write("Whare sits our sulky sullen dame,\n")
fileout.write("Gathering her brows like gathering storm,\n")
fileout.write("Nursing her wrath to keep it warm.\n")
fileout.write("\nRobert Burns\n")
fileout.write("When chapman billies leave the street,\n")
fileout.write("And drouthy neebors, neebors meet,\n")
fileout.write("As market-days are wearing late,\n")
fileout.write("An' folk begin to tak the gate;\n")
fileout.write("While we sit bousing at the nappy,\n")
fileout.write("And getting fou and unco' happy,\n")
fileout.write("We think na on the lang Scots miles,\n")
fileout.write("The mosses, waters, slaps and styles,\n")
fileout.write("That lie between us and our hame,\n")
fileout.write("Whare sits our sulky sullen dame,\n")
fileout.write("Gathering her brows like gathering storm,\n")
fileout.write("Nursing her wrath to keep it warm.\n")
fileout.write("\nRobert Burns\n")
fileout.close()
main()
fileout.close()
```
......
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