Comments for CS 3220 http://blogs.cornell.edu/cs3220 Course blog for CS 3220, Spring 2010 Thu, 06 May 2010 02:17:33 +0000 hourly 1 http://blogs.cornell.edu/?v=3.4.1 Comment on Project 3 by Manolis Savva http://blogs.cornell.edu/cs3220/2010/04/27/project-3/comment-page-1/#comment-233 Manolis Savva Thu, 06 May 2010 02:17:33 +0000 http://blogs.cornell.edu/cs3220/?p=67#comment-233 @student: You can zip only the .m files you actually changed if you want. Be sure to include some documentation answering the required questions as well. @student: You can zip only the .m files you actually changed if you want. Be sure to include some documentation answering the required questions as well.

]]> Comment on Project 3 by Manolis Savva http://blogs.cornell.edu/cs3220/2010/04/27/project-3/comment-page-1/#comment-232 Manolis Savva Thu, 06 May 2010 02:16:34 +0000 http://blogs.cornell.edu/cs3220/?p=67#comment-232 @mt438: At timesteps of those sizes forward euler may indeed explode for the bike scene. @mt438: At timesteps of those sizes forward euler may indeed explode for the bike scene.

]]> Comment on Project 3 by student http://blogs.cornell.edu/cs3220/2010/04/27/project-3/comment-page-1/#comment-231 student Thu, 06 May 2010 01:50:46 +0000 http://blogs.cornell.edu/cs3220/?p=67#comment-231 Hi, What are you supposed to submit for this project? I zipped the m files I actually coded but the handout says to submit "all MATLAB code you used." Does this include other files included in the framework? Thanks, Hi,
What are you supposed to submit for this project? I zipped the m files I actually coded but the handout says to submit “all MATLAB code you used.” Does this include other files included in the framework?

Thanks,

]]> Comment on Project 3 by mt438 http://blogs.cornell.edu/cs3220/2010/04/27/project-3/comment-page-1/#comment-230 mt438 Thu, 06 May 2010 00:41:36 +0000 http://blogs.cornell.edu/cs3220/?p=67#comment-230 I observe some explosive behavior when I try to run scenes such as the bike with forward euler method and timestep = 0.25. Other methods work well with the same setting. Is this expected? I observe some explosive behavior when I try to run scenes such as the bike with forward euler method and timestep = 0.25. Other methods work well with the same setting. Is this expected?

]]> Comment on Project 3 by Manolis Savva http://blogs.cornell.edu/cs3220/2010/04/27/project-3/comment-page-1/#comment-229 Manolis Savva Thu, 06 May 2010 00:36:25 +0000 http://blogs.cornell.edu/cs3220/?p=67#comment-229 @mt438: You can use matlab's curve fitting functionality available from Tools menu, Basic Fitting at the top of a Figure window. This only works on one data set at a time. It should also be relatively easy to manually measure the gradient by taking the typical "dy/dx" approach. @mt438: You can use matlab’s curve fitting functionality available from Tools menu, Basic Fitting at the top of a Figure window. This only works on one data set at a time. It should also be relatively easy to manually measure the gradient by taking the typical “dy/dx” approach.

]]> Comment on Project 3 by mt438 http://blogs.cornell.edu/cs3220/2010/04/27/project-3/comment-page-1/#comment-228 mt438 Wed, 05 May 2010 23:49:00 +0000 http://blogs.cornell.edu/cs3220/?p=67#comment-228 Does matlab have a function to return the slope of the linear regression line of two data sets? Does matlab have a function to return the slope of the linear regression line of two data sets?

]]> Comment on Project 3 by Manolis Savva http://blogs.cornell.edu/cs3220/2010/04/27/project-3/comment-page-1/#comment-227 Manolis Savva Wed, 05 May 2010 13:03:05 +0000 http://blogs.cornell.edu/cs3220/?p=67#comment-227 @Daniel: Yes, you're right, the size of the matrix is (# of springs) x 5. @Daniel: Yes, you’re right, the size of the matrix is (# of springs) x 5.

]]> Comment on Project 3 by Manolis Savva http://blogs.cornell.edu/cs3220/2010/04/27/project-3/comment-page-1/#comment-226 Manolis Savva Wed, 05 May 2010 13:02:25 +0000 http://blogs.cornell.edu/cs3220/?p=67#comment-226 @fk: There may be more than one type of damping on a particle since we have viscous damping for all particles with a non-zero velocity and also spring force damping for particles that are attached to a spring. You don't have to worry about "disabling" viscous damping outside the screen region. @fk: There may be more than one type of damping on a particle since we have viscous damping for all particles with a non-zero velocity and also spring force damping for particles that are attached to a spring. You don’t have to worry about “disabling” viscous damping outside the screen region.

]]> Comment on Project 3 by Daniel Brooks djb332 http://blogs.cornell.edu/cs3220/2010/04/27/project-3/comment-page-1/#comment-225 Daniel Brooks djb332 Wed, 05 May 2010 09:37:27 +0000 http://blogs.cornell.edu/cs3220/?p=67#comment-225 I'm pretty sure there's a typo in the handout. It says that the size of the spring matrix is n by 5 matrix where n is the number of particles. This is incorrect, as spring is a (# of springs) x 5 matrix. I’m pretty sure there’s a typo in the handout. It says that the size of the spring matrix is n by 5 matrix where n is the number of particles. This is incorrect, as spring is a (# of springs) x 5 matrix.

]]> Comment on Project 3 by fk http://blogs.cornell.edu/cs3220/2010/04/27/project-3/comment-page-1/#comment-224 fk Wed, 05 May 2010 00:06:47 +0000 http://blogs.cornell.edu/cs3220/?p=67#comment-224 there should only be one type of damping on a particle at any point in time, right? Because if a particle is in a wall (or in the probe) it can't also be in the atmosphere of the rest of the setting. Thanks. there should only be one type of damping on a particle at any point in time, right? Because if a particle is in a wall (or in the probe) it can’t also be in the atmosphere of the rest of the setting.

Thanks.

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