Expert answer:lab 7 modification dictionaries in python

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lab_7_instructions.pdf

lab_7.pdf

sparse_matrix.txt

the_produced_out_put.txt

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10/16/2017
CSCI 127, In-Lab 7
Lab 7: Dictionaries
Logistics
Due: Tuesday, October 17th no later than midnight.
Partner Information: Complete this assignment individually.
Submission Instructions: Upload your solution, renamed to YourFirstName-YourLastName.py to the
BrightSpace Lab 7 Dropbox.
Deadline Reminder: Once this deadline passes, BrightSpace will no longer accept your Python submission
and you will no longer be able to earn credit. Thus, if you are not able to fully complete the assignment,
submit whatever you have before the deadline so that partial credit can be earned.
Learning Outcome
Gain experience with dictionaries.
Preliminaries
Matrices can be used to represent and manipulate computer graphics objects. In this assignment, we will
represent matrices using sparse dictionaries by recording only non-zero values.
Learn how matrix addition works by reading this information.
Download input file sparse-matrix.txt. The first line in the file contains the number of rows and columns
for two integer matrices. Until the word stop is encountered, the next lines provide information about nonzero entries in the first matrix. The first integer on the line is the row number, the second integer is the
column number and the third integer is the contents of that matrix entry. Once information about the first
matrix is known, information about the second matrix is provided using the same format.
Download lab7.py, rename it according to the instructions above, and make sure you understand it.
Assignment
Take the program above and modify it by adding the two missing functions. When the program is run on
the output file above, it should produce this output.
Helpful Hint
Review how to format output in Python.
Grading – 10 points
4 points – Your program’s output matches the output format of the transcript above (1 point for each type
of difference up to 4 points).
1 point – The print_matrix function uses the print_header function correctly.
3 points – Matrix addition is performed correctly (all or nothing).
2 points – Zeros do not appear in matrix_3.
https://www.cs.montana.edu/paxton/classes/csci127/inlabs/lab7/
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10/16/2017
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https://www.cs.montana.edu/paxton/classes/csci127/inlabs/lab7/lab7.py
————————————-CSCI 127, Lab 7
October 17, 2017
Your Name
————————————–
# ————————————-# Do not change anything below this line
# ————————————-def print_header(columns):
line = “+”
for i in range(columns):
line += “—+”
print(line)
# ————————————-def read_matrix(input_file):
matrix = {}
line = input_file.readline().split()
while line[0] != “stop”:
row = int(line[0])
column = int(line[1])
value = int(line[2])
matrix[(row, column)] = value
line = input_file.readline().split()
return matrix
# ————————————-def main (file_name):
input_file = open(file_name, “r”)
line = input_file.readline().split()
rows = int(line[0])
columns = int(line[1])
matrix_1 = read_matrix(input_file)
print_matrix(matrix_1, rows, columns, “Matrix 1”)
matrix_2 = read_matrix(input_file)
print_matrix(matrix_2, rows, columns, “Matrix 2”)
matrix_3 = add_matrices(matrix_1, matrix_2, rows, columns)
print_matrix(matrix_3, rows, columns, “Matrix 1 + Matrix 2”)
print(“Matrix 3 =”, matrix_3)
# ————————————-main (“sparse-matrix.txt”)
https://www.cs.montana.edu/paxton/classes/csci127/inlabs/lab7/lab7.py
1/1
3 4
2 2 5
1 2 4
0 1 2
0 0 1
1 1 3
2 3 6
stop
0 1 1
0 2 2
1 2 3
1 3 4
2 0 6
2 3 -6
stopMatrix 1
+—+—+—+—+
| 1| 2| 0| 0|
+—+—+—+—+
| 0| 3| 4| 0|
+—+—+—+—+
| 0| 0| 5| 6|
+—+—+—+—+
Matrix 2
+—+—+—+—+
| 0| 1| 2| 0|
+—+—+—+—+
| 0| 0| 3| 4|
+—+—+—+—+
| 6| 0| 0| -6|
+—+—+—+—+
Matrix 1 + Matrix 2
+—+—+—+—+
| 1| 3| 2| 0|
+—+—+—+—+
| 0| 3| 7| 4|
+—+—+—+—+
| 6| 0| 5| 0|
+—+—+—+—+
Matrix 3 = {(0, 0): 1, (0, 1): 3, (0, 2): 2, (1, 1): 3, (1, 2): 7, (1, 3): 4, (2, 0): 6, (2, 2): 5} …
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