# 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 - either use the Feedback button on the left or email me.

## Christian's activity

#### Christian Lawson-Perfect on Converting from standard index form to decimal. 4 months ago

Saved a checkpoint:

Replaced string restriction with a pattern restriction

#### Christian Lawson-Perfect on Truth tables 4 (v2) 4 months ago

Saved a checkpoint:

Can't convert grids of booleans to matrices automatically any more, so I've added a function 'bool_matrix' to do that.

#### Christian Lawson-Perfect on Transportation problem - stepping stones 4 months ago

Saved a checkpoint:

Replaced javascript in part b with a custom marking algorithm.

#### Christian Lawson-Perfect on Simplex method - 4 or 5 random inequalities 4 months ago

Saved a checkpoint:

Replaced javascript in part a with a custom marking algorithm

#### Christian Lawson-Perfect on Simplex algorithm - bus company 4 months ago

Saved a checkpoint:

Replaced javascript for part h with a custom marking algorithm

#### Christian Lawson-Perfect on Hungarian algorithm 4 months ago

Saved a checkpoint:

Replaced javascript in part a with a custom marking algorithm

#### Christian Lawson-Perfect on Finding bases for the null space and row space of a matrix 4 months ago

Saved a checkpoint:

Need to replace the javascript in part c with a custom marking algorithm.

#### Christian Lawson-Perfect on Finding bases for the null space and row space of a matrix 4 months ago

Gave some feedback: Doesn't work

#### Christian Lawson-Perfect on Find n such that $\sigma(n)$ is the given number 4 months ago

Saved a checkpoint:

Part b seemed to be just some debugging info, so I've removed it

#### Christian Lawson-Perfect on Find n such that $\sigma(n)$ is the given number 4 months ago

Gave some feedback: Needs to be tested