Input 3

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steve kilgallon

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steve kilgallon 8 years, 7 months ago

Created this as a copy of Input 3.

Name	Status	Author	Last Modified
Input 3	Ready to use	Christian Lawson-Perfect	01/06/2016 11:03
Numbas: Inputting powers	Ready to use	Lois Rollings	27/07/2016 10:57
Input 3	draft	steve kilgallon	18/08/2016 16:06
Clare's copy of Input 3	draft	Clare Lundon	05/09/2019 17:10

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Question statement

In this example we show you how to input powers. It is important that you get this right as many questions ask for such inputs.

$a^b$ is input as a^b.

But you have to be careful with inputting such expressions as

$e^{2x},\;x^{-2},\;(xy)^2$

In these cases the exponent must be enclosed in brackets.

Power	Correct Input	Incorrect Input	Why it's wrong
$e^{2x}$	`e^(2*x)`	`e^2*x`	The system thinks this is $(e^2) \cdot x$
$x^{-2}$	`x^(-2)`	`x^-2`	This produces an error
$(xy)^2$	`(x*y)^2`	`x*y^2`	The system thinks this is $x \cdot (y^2)$

So make sure that you use brackets to properly define your powers. This is a major source of input inaccuracies.

To test your input of powers, try the following examples.

Give any introductory information the student needs.

			Name	Type	Generated Value

a	integer	9
d	integer	-7
c	integer	-12
s	integer	1
f	integer	-5

Automatically regenerate variables?

Name

Data type

Value

xxxxxxxxxx
 
random(6..12)*s

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: `integer`

← Depends on:

This variable doesn't seem to be used anywhere.

Parts

Part a) Gap-fill
1. Gap Mathematical expression
  Add
Part b) Gap-fill
1. Gap Mathematical expression
  Add
Part c) Gap-fill
1. Gap Mathematical expression
  Add

Gap-fill

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

Write $e^{\simplify{{a}x}}$ . Unnamed gap

Your input is shown in mathematical notation in a box next to your input so that you can check that you have entered it correctly.

Click on Submit part to check your answer.

Click on the input field and remove the brackets, then re-submit and see what happens.

Advice

Give a worked solution to the whole question.

Use this tab to check that this question works as expected.

There was an error which means the tests can't run:

Part	Test	Passed?
Gap-fill
Gap-fill		Hasn't run yet
Mathematical expression
Mathematical expression		Hasn't run yet
Gap-fill
Gap-fill		Hasn't run yet
Mathematical expression
Mathematical expression		Hasn't run yet
Gap-fill
Gap-fill		Hasn't run yet
Mathematical expression
Mathematical expression		Hasn't run yet

This question is used in the following exam:

Using Numbas a student guide by steve kilgallon in AA How to examples.

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Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

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Checkpoint description

steve kilgallon 8 years, 7 months ago

Error in variable testing condition

Error

Warning

Generated value: `integer`

Parts

Gap-fill

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Error

Input 3

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

History

Comment

Checkpoint description

steve kilgallon 8 years, 7 months ago

Error in variable testing condition

Error

Warning

Generated value: integer

Parts

Gap-fill

Generated value: `integer`