copy of Matrix times vector

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Julia Goedecke

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

Julia Goedecke

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Ready to use

4 years, 6 months ago

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Julia Goedecke 4 years, 6 months ago

Published this.

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Julia Goedecke 4 years, 6 months ago

Gave some feedback: Ready to use

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Julia Goedecke 4 years, 6 months ago

Gave some feedback: Needs to be tested

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Julia Goedecke 4 years, 6 months ago

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

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 of size 2×4
va	vector	vector(-2,2,-2,-2)
rawunresolvedAva	list	List of 8 items
unresolvedAva	string	\begin{pmatrix}(-3)\cdot(-2)+(
m	integer	2
n	integer	4

Automatically regenerate variables?

Name

Data type

Value

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

JME function reference

Description

Describe what this variable represents, and list any assumptions made about its value.

Can an exam override the value of this variable?

Generated value: `matrix`

matrix([-3,-1,-3,-1],[3,-1,3,1])

← Depends on:

→ Used by:

rawunresolvedAva

Advice
"Unnamed part" - prompt
"Unnamed part" → "Unnamed gap" - Correct answer

Parts

Gap-fill
1. Gap Matrix entry
  Add

Gap-fill

Ask the student a question, and give any hints about how they should answer this part.

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

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Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

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Checkpoint description

Julia Goedecke 4 years, 6 months ago

Julia Goedecke 4 years, 6 months ago

Julia Goedecke 4 years, 6 months ago

Julia Goedecke 4 years, 6 months ago

Error in variable testing condition

Error

Warning

Generated value: `matrix`

Parts

Gap-fill

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copy of Matrix times vector

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

Julia Goedecke 4 years, 6 months ago

Julia Goedecke 4 years, 6 months ago

Julia Goedecke 4 years, 6 months ago

Julia Goedecke 4 years, 6 months ago

Error in variable testing condition

Error

Warning

Generated value: matrix

Parts

Gap-fill

Generated value: `matrix`