--- a/getting-started-with-arrays/questions.rst Wed Nov 17 23:24:57 2010 +0530
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,132 +0,0 @@
-Objective Questions
--------------------
-
-.. A mininum of 8 questions here (along with answers)
-
-1. An array in Python is the same as a Python list
-
- a. True
- #. False
-
-Answer: False
-
-2. ``x = array([1, 2, 3], [5, 6, 7])`` is a valid statement
-
- a. True
- #. False
-
-Answer: False
-
-3. What will be the output of the following code,
- ::
-
- x = array([[1, 2, 3], ['a', 2, 'c']])
- print x[0][0] + x[0][1] + x[0][2]
-
- a. 6
- #. 123
- #. a2c
- #. Error as array takes only homogeneous elements
-
-Answer: 123
-
-4. What will be the output of the following code,
- ::
-
- x = [[1, 2, 3], [4.1, 4.2, 4.3], ['6','7',8]]
- y = array(x)
- print y[-1][-2] + y[-1][-1] + y[-2][0] + y[0][-2]
-
- a. 21.1
- #. 12.5
- #. 784.12
- #. Error as array takes only homogeneous elements
-
- .. 4.2 4.3 2 2
-
-Answer: 784.12
-
-5. What is the output of the following code,
- ::
-
- x = array([[1, 2, 3], ['a', 2, 'c']])
- identity(x.shape)
-
- a. Will create an identity matrix of shape (2, 3).
- #. ``identity()`` function takes an integer as argument and a tuple
- is passed.
- #. Will return, array([[1,0,1],[0,1,0]])
- #. Will return, array([[0,1,0],[0,1,0]])
-
-Answer: ``identity()`` function takes an integer as argument and a
- tuple is passed.
-
-6. ``ones_like()`` function?
-
- (A) Returns an array of ones with the same shape and type as a
- given array.
- (B) Return a new array of given shape and type, filled with ones.
-
- Read the statements and answer,
-
- a. Only statement A is correct.
- #. Only statement B is correct.
- #. Both statement A and B are correct.
- #. Both statement A and B are incorrect.
-
-Answer: Only statement A is correct.
-
-7. ``zeros_like()`` function?
-
- (A) Return a new array of given shape and type, filled with zeros.
- (B) Returns an array of zeros with the same shape and type as a
- given array.
-
-
- Read the statements and answer,
-
- a. Only statement A is correct.
- #. Only statement B is correct.
- #. Both statement A and B are correct.
- #. Both statement A and B are incorrect.
-
-Answer: Only statement B is correct.
-
-8. What will be output of the following code snippet.
- ::
-
- x = linspace(1,10,10).reshape(5,2)
- print (x[-3]+x[-4]).sum()
-
- a. 10.0
- #. 18.0
- #. 14.0
- #. 16.44
- #. Error
-
-Answer: 18
-
-Larger Questions
-----------------
-
-.. A minimum of 2 questions here (along with answers)
-
-1. Write a python script to create a 15x15 array of equally spaced 225
- elements from 1 to 1000, add 5 to each of the diagonal elements and
- find the sum of all odd rows of the array. Say for example the
- array,
- ::
-
- x = array([[1, 2, 3],
- [4, 5, 6],
- [7, 8, 9]])
-
- will give answer 40 ((1+5) + 2 + 3 + 7 + 8 + (9+5)).
-
-2. For any given array([a1, a2, a3, .. , an]) the Vandermonde matrix
- will be [[1, a1, a1**2, .. , a1**(n-1)], [1, a2, a2**2, .. ,
- a2**(n-1)], .. , [1, an, an**2, .. ,an**(n-1)]]. Write a python
- script to generate the Vandermonde matrix and find the determinant
- of the matrix for [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
- 16, 17, 18, 19, 20]. [Hint: to find the determinant use the
- function ``det()`` from ``linalg`` module.]