Day #24 - Python Code Examples

Examples for - for loop, while loop, dictionary, function examples and plotting graphs

	#Example 1 - Working on Float Variables
	print 'Program 1'
	i = 5.44
	j = 3.0
	print j/i
	#Example 2 - For loop
	print 'Program 2'
	for i in range(1,10):
	print i
	i = i+1
	#Example 3 - While Loop with break condition
	print 'Program 3'
	print 'while loop'
	i = 1
	while(i<10):
	print i
	i = i+1
	if(i>5):
	break
	print 'Program 4'
	#Example 4 - Working with Functions and Dictionary
	def computevalues(initval):
	f_ = {}
	i = 0
	while(i<10):
	try:
	f_[i] = i
	i = i+1
	except Exception:
	pass
	return f_
	f_ = {}
	f_ = computevalues(0.01)
	print 'f_'
	for key,value in f_.iteritems():
	print value
	#Example 5 - Plot Graphs
	print 'Program 5'
	import matplotlib.pyplot as plt
	x = [-.001,-0.0005,-0.0001,-0.00005,-0.00001]
	y = [103,178,523,738,880]
	plt.xlabel("X Values")
	plt.ylabel("Y Values")
	plt.plot(x,y,'-o', color = 'g')
	plt.title("Demo X,Y Graph")
	plt.show()
	#Matrix and SVD
	import numpy as np
	from sympy import Matrix
	b = np.arange(1,50,1)
	z = np.eye(3,3)
	print(z)
	print("b")
	print(b)
	a = np.matrix([[2,2,5],[-4,2,3],[0,0,0]])
	print("eig vector")
	print(np.linalg.eig(a))
	print("eig vals")
	print(np.linalg.eigvals(a))
	print("svd")
	print(np.linalg.svd(a))
	print("null space")
	A = Matrix(a)
	print(A*A.nullspace()[0])

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Happy Learning!!