Christian Lawson-Perfect
Member of the e-learning unit in Newcastle University's School of Mathematics and Statistics.
Lead developer of Numbas.
I'm happy to answer any questions - email me.
Christian's activity
Christian Lawson-Perfect commented on Basic R: Part 2a 9 years, 3 months ago
I don't think this contains any errors any more, but it certainly could do with explaining itself a bit better.
Christian Lawson-Perfect on Basic R: Part 2a 9 years, 3 months ago
Gave some feedback: Needs to be tested
Christian Lawson-Perfect on Amy's second copy of Question 10 length of vectors 9 years, 3 months ago
Saved a checkpoint:
Fixed the advice and the definition of x.
Christian Lawson-Perfect on Amy's copy of Question 10 length of vectors 9 years, 3 months ago
Saved a checkpoint:
Fixed the advice.
Christian Lawson-Perfect on Question 10 length of vectors 9 years, 3 months ago
Saved a checkpoint:
Fixed the advice.
Christian Lawson-Perfect on Question 10 length of vectors 9 years, 3 months ago
Gave some feedback: Ready to use
Christian Lawson-Perfect on Question 6 types of variables 9 years, 3 months ago
Saved a checkpoint:
Improved the advice.
Christian Lawson-Perfect on Amy's copy of Question 10 length of vectors 9 years, 3 months ago
Saved a checkpoint:
The length of seq(a,b) is $b-a+1$, whereas this question thought it was $b-a$.
To fix it, I've subtracted one from the second argument to seq so that I don't have to change any variable definitions.
Christian Lawson-Perfect on Basic R: Part 1 9 years, 3 months ago
Gave some feedback: Ready to use
Christian Lawson-Perfect on Question 10 length of vectors 9 years, 3 months ago
Saved a checkpoint:
Fixed usage of c:
seq(a,b)returns the numbers a to b inclusive, so its length is $a-b+1$. Since the rest of the question was set up to assume it's just $a-b$, I've subtracted 1 from the second argument toseqin the statement.