Recent content by Yoss

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    Help finding ortho matrix for conic section eq

    I am familiar with that, but we have to find the transformed center as well as the axis of rotation.
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    Help finding ortho matrix for conic section eq

    (I know it should be normalized, but that's a lot of tex. The length of each of the vectors is so the determinant of this P should be 20, so the normalized form will equal 1. Ugh, I forgot to foil (3 + \sqrt{10})^2 when computing the distance. I guess this is the right answer after all.
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    Help finding ortho matrix for conic section eq

    I do understand that part. I know that for \lambda_1 = \frac{5 + \sqrt{10}}{2} will give (3 + \sqrt{10})x - y = 0 -x + (-3 + \sqrt{10})y = 0 and that's just solving for one of the equations like you said. I get, for instance \newcommand{\colv}[2] {\left(\begin{array}{c} #1 \\ #2...
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    Help finding ortho matrix for conic section eq

    I need to classify the conic given by the following equation: x^2 + xy + 4y^2 + 3x - 9 = 0 I found A = \left(\begin{array}{cc}1 & \frac{1}{2}\\\frac{1}{2} & 4\end{array}\right) I need to find an orthogonal matrix P with detP = 1. So I find the eigenvalues of A I get (\lambda -...
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    Rusty - fill in missing steps, please

    Thanks, I guess I wasn't looking at it the right way. Did you need the {'s around each t in the denominator?
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    Rusty - fill in missing steps, please

    Hello everyone, I'm taking a high level Geometry course, and as it turns out, I'm a tad out of touch on at least one basic aspect learned years passed. Parabola with equation y^2 = 2x, and parametric equation x = \frac{1}{2}t^2, y = t (t \in \Re) etc. The problem is concered with finding...
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    How can we efficiently manage memory and disk usage in a BitTorrent client?

    Thanks dduardo. I bet that would have been the solution we would come to . We are using the seek() function to extract the pieces from the 100% file, I just didn't think of pre-allocation, duh! I was thinking a solution of keeping track of the order of downloaded pieces, writing the pieces in...
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    How can we efficiently manage memory and disk usage in a BitTorrent client?

    My friend and I are developing a BitTorrent Client for our CS class, but we've run into a dilemma. If anyone can point us in the right direction we'll be thankful. A little background info if you're unfamiliar with BT. The file that is to be downloaded from multiple peers is broken up into...
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    Java Finding a Method for Incremental Output in Java

    Thanks for all of your suggestions guys, but I did find out a good way to do it: '\b'. :E edit: oops Nate didn't see your reply!
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    Java Finding a Method for Incremental Output in Java

    I was curious if anyone knows if there are any methods to do the following in java. I'm writing a terminal based program in java, and it will be doing incremental updates. I want to output to the terminal the percentage done, but to replace the last output. For example: $>java jprog...
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    Linear Algebra - Subspaces proof

    Yah, looks good to me.
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    Suggestions for interdisciplinary subjects w/ comp sci major

    I was interested if anyone had suggestions of fields of study to couple with a computer science major. Thanks -Yoss
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    Solving a 400 Gal Linear Mixing Problem for Dioxin

    Thanks Tide, I got it. Sorry about the confusing notation. I'm not too savvy in LaTeX yet, and I was sort of in a rush. Been studying all night for my exam.
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    Solving a 400 Gal Linear Mixing Problem for Dioxin

    Oops, I did mean dQ/dt + (2/200 + 2t)Q = 20, but that's how I did work it out on paper and got that answer. What do you mean exactly?
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    Solving a 400 Gal Linear Mixing Problem for Dioxin

    Ok, first order linear mixing problem. "A 400 gal. tank initially contains 200 gal. of water containing 2 ppb by weight of dioxin, an extremely potent carcinogen. Suppose water containing 5 ppb of dioxin flows into the top of the tank at a rate of 4 gal/min. The water in the tank is kept well...
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