1 Objective Questions

     2 -------------------

     3 

     4 .. A mininum of 8 questions here. 

     5 

     6 1. ``loadtxt`` can read data only from a file with one column

     7    only. True or False?

     8 

     9    Answer: False

    10 

    11 #. To read a file with multiple columns, into separate simple

    12    sequences, ``loadtxt`` is given the additional argument ______?

    13 

    14    Answer: ``unpack=True``

    15 

    16 #. We have a file with two columns of data separated by one of the

    17    following characters. Which of them doesn't require the delimiter

    18    argument to be specified, when using ``loadtxt``. 

    19 

    20    a. ;

    21    #. , 

    22    #. :

    23    #. [space] 

    24    

    25    Answer: [space]

    26    

    27 #. Given a file ``data.txt`` with three columns of data separated by

    28    spaces, read it into one complex sequence. 

    29 

    30    Answer: ``x = loadtxt("data.txt")``

    31 

    32 #. Given a file ``data.txt`` with three columns of data separated by

    33    spaces, read it into 3 separate simple sequences. 

    34 

    35    Answer: ``x = loadtxt("data.txt", unpack=True)``

    36 

    37 #. Given a file ``data.txt`` with three columns of data separated by

    38    ``:``, read it into one complex sequence. 

    39 

    40    Answer: ``x = loadtxt("data.txt", delimiter=":")``

    41 

    42 #. Given a file ``data.txt`` with three columns of data separated by

    43    ":", read it into 3 separate simple sequences. 

    44 

    45    Answer: ``x = loadtxt("data.txt", unpack=True, delimiter=":")``

    46 

    47 #. To use the loadtxt command, each row should have the same number of

    48    values, T or F ?

    49 

    50    Answer: True

    51 

    52 Larger Questions

    53 ----------------

    54 

    55 .. A minimum of 2 questions here. 

    56 

    57 1. What will happen if one of the cells is empty?

    58 

    59 #. Given a file with 3 columns of data but two different delimiters,

    60    what do you think will happen?

    61 

    62 #. Read a column with text? 

    63 

    64 #. An input file contains 5 columns of data. Use only the second and fourth

    65    columns of data and load into two different variables.

    66    [hint: read the documentation, use the argument ``usecols``]

    67 .. #[bhanu: solutions are not seen to have been included.]