## A Poll at the Forum

Posted: 27th February 2014 by seanmathmodelguy in Blog

Often I see polls saying that Rob Ford has a political base that is either made of concrete or completely at odds with the reality of what it means to be a responsible leader that represents the people. The most recent example is a tweet in #TOpoli today citing an article in the Toronto Star […]

## Confirming a New Years resolution

Posted: 9th February 2014 by admin in Blog

Over the last year I have been taking note of some of the stories in the various science/tech news feeds with of hope of eventually finding the time to expound on them in a format such as this. There is really no perfect time to commence such an activity and over the winter break I […]

## Least squares and pseudo-inverses

Posted: 5th February 2014 by seanmathmodelguy in Lectures

To appreciate the connections between solutions of the system $$Ax=b$$ and least squares, we begin with two illustrative examples. Overdetermined systems: $$A$$ is $$m \times n$$ with $$m > n$$. In this case there are more equations than unknowns, $$A^{\top}A$$ is $$n\times n$$ and $$AA^{\top}$$ is $$m\times m$$. The connection with the pseudo-inverse is that […]