robintw
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 Nov 20 awarded Popular Question Apr 28 awarded Good Question Sep 17 awarded Yearling Feb 17 awarded Famous Question Sep 14 accepted A simple explanation of eigenvectors and eigenvalues with 'big picture' ideas of why on earth they matter Feb 19 awarded Notable Question Jan 6 awarded Scholar Jan 6 accepted Distance from point to line using $x \sin \theta - y \cos\theta$ Jan 5 comment Distance from point to line using $x \sin \theta - y \cos\theta$ I used GeoGebra - see geogebra.org/cms Jan 5 comment Distance from point to line using $x \sin \theta - y \cos\theta$ Thanks for the other formulation. You're right, I do understand that more, but unfortunately I need to understand the other formulation too - as the paper I am basing some of my work on uses it, and I need to understand the consequences of them not having the $+ d$ on the end of their equation. I can see that the line $y =x$ can be represented as $x \sin \theta - y \cos \theta = 0$, but I can't see how the $+ d$ bit works. It doesn't seem to behave like the y-intercept - so how, for example, should I represent $y = x + 6$ in the $\sin$ and $\cos$ formulation? Jan 4 awarded Supporter Jan 4 comment Distance from point to line using $x \sin \theta - y \cos\theta$ Thanks. Can you confirm what $d$ should be? Is it just the y-intercept? I have tried plotting the $x \sin \theta - y \cos \theta + d = 0$ for various values of $d$, and it seems to change the angle of the line, as well as the y-intercept of the line (and $d$ doesn't seem to be the y-intercept). Any ideas? Jan 3 asked Distance from point to line using $x \sin \theta - y \cos\theta$ Aug 31 awarded Popular Question Aug 3 awarded Nice Question May 3 awarded Student May 3 awarded Autobiographer May 3 asked A simple explanation of eigenvectors and eigenvalues with 'big picture' ideas of why on earth they matter