Matrix

Python/Arrays/largestelementinarray.py

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+# Python3 program to find maximum
+# in arr[] of size n
+
+# python function to find maximum
+# in arr[] of size n
+def largest(arr,n):
+
+	# Initialize maximum element
+	max = arr[0]
+
+	# Traverse array elements from second
+	# and compare every element with
+	# current max
+	for i in range(1, n):
+		if arr[i] > max:
+			max = arr[i]
+	return max
+
+# Driver Code
+arr = [10, 324, 45, 90, 9808]
+n = len(arr)
+Ans = largest(arr,n)
+print ("Largest in given array is",Ans)
+

Python/Arrays/sumofarray.py

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+# Python 3 code to find sum
+# of elements in given array
+def _sum(arr):
+
+	# initialize a variable
+	# to store the sum
+	# while iterating through
+	# the array later
+	sum=0
+
+	# iterate through the array
+	# and add each element to the sum variable
+	# one at a time
+	for i in arr:
+		sum = sum + i
+
+	return(sum)
+
+# driver function
+arr=[]
+# input values to list
+arr = [12, 3, 4, 15]
+
+# calculating length of array
+n = len(arr)
+
+ans = _sum(arr)
+
+# display sum
+print ('Sum of the array is ', ans)
+

Python/List/interchangefirstlastele.py

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+# Python3 program to swap first
+# and last element of a list
+
+# Swap function
+def swapList(newList):
+	size = len(newList)
+
+	# Swapping
+	temp = newList[0]
+	newList[0] = newList[size - 1]
+	newList[size - 1] = temp
+
+	return newList
+
+# Driver code
+newList = [12, 35, 9, 56, 24]
+
+print(swapList(newList))

Python/List/swap2elements.py

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+# Python3 program to swap elements
+# at given positions
+
+# Swap function
+def swapPositions(list, pos1, pos2):
+
+	list[pos1], list[pos2] = list[pos2], list[pos1]
+	return list
+
+# Driver function
+List = [23, 65, 19, 90]
+pos1, pos2 = 1, 3
+
+print(swapPositions(List, pos1-1, pos2-1))

Python/Matrix/add2matrix.py

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+# Program to add two matrices using nested loop
+
+X = [[1,2,3],
+	[4 ,5,6],
+	[7 ,8,9]]
+
+Y = [[9,8,7],
+	[6,5,4],
+	[3,2,1]]
+
+
+result = [[0,0,0],
+		[0,0,0],
+		[0,0,0]]
+
+# iterate through rows
+for i in range(len(X)):
+# iterate through columns
+	for j in range(len(X[0])):
+		result[i][j] = X[i][j] + Y[i][j]
+
+for r in result:
+	print(r)

Python/Matrix/multipy2matrix.py

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+# Program to multiply two matrices using nested loops
+
+# take a 3x3 matrix
+A = [[12, 7, 3],
+	[4, 5, 6],
+	[7, 8, 9]]
+
+# take a 3x4 matrix
+B = [[5, 8, 1, 2],
+	[6, 7, 3, 0],
+	[4, 5, 9, 1]]
+
+result = [[0, 0, 0, 0],
+		[0, 0, 0, 0],
+		[0, 0, 0, 0]]
+
+# iterating by row of A
+for i in range(len(A)):
+
+	# iterating by column by B
+	for j in range(len(B[0])):
+
+		# iterating by rows of B
+		for k in range(len(B)):
+			result[i][j] += A[i][k] * B[k][j]
+
+for r in result:
+	print(r)

Python/string/checkpalindrome .py

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+# function which return reverse of a string
+
+def isPalindrome(s):
+	return s == s[::-1]
+
+
+# Driver code
+s = "malayalam"
+ans = isPalindrome(s)
+
+if ans:
+	print("Yes")
+else:
+	print("No")

Python/string/reversewords.py

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+# Function to reverse words of string
+
+def rev_sentence(sentence):
+
+	# first split the string into words
+	words = sentence.split(' ')
+
+	# then reverse the split string list and join using space
+	reverse_sentence = ' '.join(reversed(words))
+
+	# finally return the joined string
+	return reverse_sentence
+
+if __name__ == "__main__":
+	input = 'geeks quiz practice code'
+	print (rev_sentence(input))