Q8: Matrix Operations def create_matrix(lst): """Create matrix will take matrix represented as a list of list. And output a function which will index the input matrix Args: lst (List of List): A list of list representation of matrix. There will be more than one element of list type in lst. Returns: [function]: An indexing function. >>> matrix_index1 = create_matrix([[1, 2], [2, 3]]) # a 2 x 2 matrix. >>> matrix_index2 = create_matrix([[1, 2, 3], [2, 3, 1]]) # a 2 x 3 matrix. >>> matrix_index3 = create_matrix([[1, 2, 3], []]) # an invalid matrix """ ### Modify your code here ### Modify your code here def matrix_index(i=None, j=None): """Indexing function which will retrive (i, j) entry of the input matrix representation Args: i (int, optional): row index. Defaults to None. (0-index) j (int, optional): column index. Defaults to None. (0-index) Return: List of List: a list of list representation of the indexed. Return None if matrix or index is invalid >>> matrix_index1() [[1, 2], [2, 3]] >>> matrix_index1(i=1) # row 1 (2nd row since 0 indexed) [[2, 3]] >>> matrix_index1(j=1) # col 1 (2nd row since 0 indexed) [[2], [3]] >>> matrix_index1(i=1, j=1) [[3]] >>> print(matrix_index1(i=1, j=10)) None # invalid index >>> print(matrix_index3()) None # invalid matrix """ ### Modify your code here return matrix_index ### Modify your code here

Q8: Matrix Operations def create_matrix(lst): """Create matrix will take matrix represented as a list of list. And output a function which will index the input matrix Args: lst (List of List): A list of list representation of matrix. There will be more than one element of list type in lst. Returns: [function]: An indexing function. >>> matrix_index1 = create_matrix([[1, 2], [2, 3]]) # a 2 x 2 matrix. >>> matrix_index2 = create_matrix([[1, 2, 3], [2, 3, 1]]) # a 2 x 3 matrix. >>> matrix_index3 = create_matrix([[1, 2, 3], []]) # an invalid matrix """ ### Modify your code here ### Modify your code here def matrix_index(i=None, j=None): """Indexing function which will retrive (i, j) entry of the input matrix representation Args: i (int, optional): row index. Defaults to None. (0-index) j (int, optional): column index. Defaults to None. (0-index) Return: List of List: a list of list representation of the indexed. Return None if matrix or index is invalid >>> matrix_index1() [[1, 2], [2, 3]] >>> matrix_index1(i=1) # row 1 (2nd row since 0 indexed) [[2, 3]] >>> matrix_index1(j=1) # col 1 (2nd row since 0 indexed) [[2], [3]] >>> matrix_index1(i=1, j=1) [[3]] >>> print(matrix_index1(i=1, j=10)) None # invalid index >>> print(matrix_index3()) None # invalid matrix """ ### Modify your code here return matrix_index ### Modify your code here

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

### Q8: Matrix Operations

def create_matrix(lst):

"""Create matrix will take matrix represented as a list of list.

And output a function which will index the input matrix

Args:

lst (List of List): A list of list representation of matrix.

There will be more than one element of list type in lst.

Returns:

[function]: An indexing function.

>>> matrix_index1 = create_matrix([[1, 2], [2, 3]]) # a 2 x 2 matrix.

>>> matrix_index2 = create_matrix([[1, 2, 3], [2, 3, 1]]) # a 2 x 3 matrix.

>>> matrix_index3 = create_matrix([[1, 2, 3], []]) # an invalid matrix

"""

### Modify your code here

def matrix_index(i=None, j=None):

"""Indexing function which will retrive (i, j) entry of the input

matrix representation

Args:

i (int, optional): row index. Defaults to None. (0-index)

j (int, optional): column index. Defaults to None. (0-index)

Return:

List of List: a list of list representation of the indexed.

Return None if matrix or index is invalid

>>> matrix_index1()

[[1, 2], [2, 3]]

>>> matrix_index1(i=1) # row 1 (2nd row since 0 indexed)

[[2, 3]]

>>> matrix_index1(j=1) # col 1 (2nd row since 0 indexed)

[[2], [3]]

>>> matrix_index1(i=1, j=1)

[[3]]

>>> print(matrix_index1(i=1, j=10))

None # invalid index

>>> print(matrix_index3())

None # invalid matrix

"""

### Modify your code here

return matrix_index

### Modify your code here

### Q8: Matrix Operations
def create_matrix(1st):
"""Create matrix will take matrix represented as a list of list.
And output a function which will index the input matrix
Args:
1st (List of List): A list of list representation of matrix.
There will be more than one element of list type in 1st.
Returns:
[function]: An indexing function.
>> matrix_index1 = create_matrix([[1, 2], [2, 3]]) # a 2 x 2 matrix.
>>> matrix_index2
>>> matrix_index3 = create_matrix([[1, 2, 3], []]) # an invalid matrix
create_matrix([[1, 2, 3], [2, 3, 1]]) # a 2 x 3 matrix.
### Modify your code here
### Modify your code here
def matrix_index(i=None, j=None):
"""Indexing function which will retrive (i, j) entry of the input
matrix representation
Args:
i (int, optional): row index. Defaults to None. (0-index)
j (int, optional): column index. Defaults to None. (0-index)
Return:
List of List: a list of list representation of the indexed.
Return None if matrix or index is invalid
>>> matrix_index1()
[[1, 2], [2, 3]]
>>> matrix_index1(i=1) # row 1 (2nd row since 0 indexed)
[[2, 3]]
>>> matrix_index1(j=1) # col 1 (2nd row since e indexed)
[[2], [3]]
>>> matrix_index1(i=1, j=1)
[[3]]
>>> print(matrix_index1(i=1, j=1®))
None # invalid index
>>> print(matrix_index3())
None # invalid matrix
### Modify your code here
return matrix_index
### Modify your code here

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