robintw
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 Sep17 awarded Yearling Feb17 awarded Famous Question Sep14 accepted A simple explanation of eigenvectors and eigenvalues with 'big picture' ideas of why on earth they matter Feb19 awarded Notable Question Jan6 awarded Scholar Jan6 accepted Distance from point to line using $x \sin \theta - y \cos\theta$ Jan5 comment Distance from point to line using $x \sin \theta - y \cos\theta$ I used GeoGebra - see geogebra.org/cms Jan5 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? Jan4 awarded Supporter Jan4 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? Jan3 asked Distance from point to line using $x \sin \theta - y \cos\theta$ Aug31 awarded Popular Question Aug3 awarded Nice Question May3 awarded Student May3 awarded Autobiographer May3 asked A simple explanation of eigenvectors and eigenvalues with 'big picture' ideas of why on earth they matter