Matrix times vector (WBQ 1.27 randomized)

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Julia Goedecke

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From users who are members of Linear Algebra 1st year :

Iain Gunn	said	Ready to use	4 years, 6 months ago
Julia Goedecke	said	Needs to be tested	4 years, 7 months ago

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Iain Gunn 4 years, 6 months ago

Gave some feedback: Ready to use

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Julia Goedecke 4 years, 7 months ago

Published this.

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Julia Goedecke 4 years, 7 months ago

Gave some feedback: Needs to be tested

○

Julia Goedecke 4 years, 7 months ago

Created this as a copy of Matrix times vector (same as WBQ 1.27).

Name	Status	Author	Last Modified
Matrix times vector (same as WBQ 1.27)	Ready to use	Julia Goedecke	25/08/2021 12:57
Matrix times vector (WBQ 1.27 randomized)	Ready to use	Julia Goedecke	25/08/2021 12:57
copy of Matrix times vector	Ready to use	Julia Goedecke	25/08/2021 12:57
copy of Matrix times vector (WBQ 1.27 randomized)	Ready to use	Julia Goedecke	25/08/2021 12:57

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Question statement

Calculate the following:

Give any introductory information the student needs.

			Name	Type	Generated Value

A	matrix	matrix([-2,-3],[2,3],[0,3])
va	vector	vector(0,1)
rawunresolvedAva	list	List of 6 items
unresolvedAva	string	\begin{pmatrix}(-2)\cdot0+(-3)
m	integer	3
n	integer	2

Automatically regenerate variables?

Name

Data type

Value

xxxxxxxxxx
 
matrix(repeat(repeat(random(-3..3),n),m))

JME function reference

Description

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Generated value: `matrix`

matrix([-2,-3],[2,3],[0,3])

← Depends on:

This variable doesn't seem to be used anywhere.

Parts

Gap-fill
1. Gap Matrix entry
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Gap-fill

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$\var{A}\var{va}=$ Unnamed gap

Advice

To calculate matrix times vector, we calculate this row by row: the first entry of the resulting vector is "row 1 of the matrix times the vector". For example

$\begin{pmatrix} a_{11} & a_{12} \\ a_{21} & a_{22}\end{pmatrix} \begin{pmatrix}x_1\\x_2\end{pmatrix}= \begin{pmatrix} a_{11}x_1+a_{12}x_2 \\ a_{21}x_1+a_{22}x_2\end{pmatrix}$

$\var{A}\var{va}=\var{unresolvedAva}=\var{A*va}$

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Part	Test	Passed?
Gap-fill
Gap-fill		Hasn't run yet
Matrix entry
Matrix entry		Hasn't run yet

This question is not used in any exams.

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Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

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Checkpoint description

Iain Gunn 4 years, 6 months ago

Julia Goedecke 4 years, 7 months ago

Julia Goedecke 4 years, 7 months ago

Julia Goedecke 4 years, 7 months ago

Error in variable testing condition

Error

Warning

Generated value: `matrix`

Parts

Gap-fill

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Matrix times vector (WBQ 1.27 randomized)

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

Iain Gunn 4 years, 6 months ago

Julia Goedecke 4 years, 7 months ago

Julia Goedecke 4 years, 7 months ago

Julia Goedecke 4 years, 7 months ago

Error in variable testing condition

Error

Warning

Generated value: matrix

Parts

Gap-fill

Generated value: `matrix`