+
−Objective Questions
+
−-------------------
+
−
+
−.. A mininum of 8 questions here. 
+
−
+
−1. ``loadtxt`` can read data only from a file with one column
+
−   only. True or False?
+
−
+
−   Answer: False
+
−
+
−#. To read a file with multiple columns, into separate simple
+
−   sequences, ``loadtxt`` is given the additional argument ______?
+
−
+
−   Answer: ``unpack=True``
+
−
+
−#. We have a file with two columns of data separated by one of the
+
−   following characters. Which of them doesn't require the delimiter
+
−   argument to be specified, when using ``loadtxt``. 
+
−
+
−   a. ;
+
−   #. , 
+
−   #. :
+
−   #. [space] 
+
−   
+
−   Answer: [space]
+
−   
+
−#. Given a file ``data.txt`` with three columns of data separated by
+
−   spaces, read it into one complex sequence. 
+
−
+
−   Answer: ``x = loadtxt("data.txt")``
+
−
+
−#. Given a file ``data.txt`` with three columns of data separated by
+
−   spaces, read it into 3 separate simple sequences. 
+
−
+
−   Answer: ``x = loadtxt("data.txt", unpack=True)``
+
−
+
−#. Given a file ``data.txt`` with three columns of data separated by
+
−   ``:``, read it into one complex sequence. 
+
−
+
−   Answer: ``x = loadtxt("data.txt", delimiter=":")``
+
−
+
−#. Given a file ``data.txt`` with three columns of data separated by
+
−   ":", read it into 3 separate simple sequences. 
+
−
+
−   Answer: ``x = loadtxt("data.txt", unpack=True, delimiter=":")``
+
−
+
−#. To use the loadtxt command, each row should have the same number of
+
−   values, T or F ?
+
−
+
−   Answer: True
+
−
+
−Larger Questions
+
−----------------
+
−
+
−.. A minimum of 2 questions here. 
+
−
+
−1. What will happen if one of the cells is empty?
+
−
+
−#. Given a file with 3 columns of data but two different delimiters,
+
−   what do you think will happen?
+
−
+
−#. Read a column with text? 
+
−
+
−#. An input file contains 5 columns of data. Use only the second and fourth
+
−   columns of data and load into two different variables.
+
−   [hint: read the documentation, use the argument ``usecols``]
+
−.. #[bhanu: solutions are not seen to have been included.]