Most Annoying csssm posts
in [Matlab]
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From: Duane Hanselman on 13 Sep 2006 09:11 Here's a list of most annoying cssm posts. (Started in a different thread.) Please add yours as well as suggested replies. I'd like to keep this around so annoying posts can get quick "cut and paste" answers. 1. Please give me my plp. Reply: <http://www.mathworks.com/support/solutions/data/1-16LU2.html?solution=1-16LU2> 2. I have homework due tomorrow. Can you tell me how to do it? Reply: The folks here at cssm are busy professionals. We generally do not do homework for others because we did ours when we were in school. If you show us what you have done so far and ask a specific question about it, you may get debugging help. 3. I'm new at MATLAB and I'm doing a project on "some topic name". Please send me anything you have. (Or) I'm doing graduate research on "some topic name". Please send me the code (so I can my degree). Reply: You can find plenty of information on your topic by searching the internet. You can also search through the MATLAB File Exchange <http://www.mathworks.com/matlabcentral/fileexchange/loadCategory.do> or MATLAB functions that are helpful. 4. Can you tell me what is wrong with the following code? (many lines of uncommented code with no description of what it is supposed to do) Reply: ? 5. Why does 1 not equal 1? (or any other equality comparison using floating point numbers) This must be a bug in MATLAB. Reply: ? 6. How come The Mathworks employees haven't responded to my post? (Or) I posted this request an hour ago, why hasen't anyone answered it yet? Reply: ?
From: Rune Allnor on 13 Sep 2006 09:56 Duane Hanselman skrev: > Here's a list of most annoying cssm posts. (Started in a different > thread.) Please add yours as well as suggested replies. I'd like to > keep this around so annoying posts can get quick "cut and paste" > answers. > > 1. Please give me my plp. > > Reply: <http://www.mathworks.com/support/solutions/data/1-16LU2.html?solution=1-16LU2> > > 2. I have homework due tomorrow. Can you tell me how to do it? > > Reply: The folks here at cssm are busy professionals. We generally do > not do homework for others because we did ours when we were in > school. If you show us what you have done so far and ask a specific > question about it, you may get debugging help. > > 3. I'm new at MATLAB and I'm doing a project on "some topic name". > Please send me anything you have. > (Or) I'm doing graduate research on "some topic name". Please send me > the code (so I can my degree). > > Reply: You can find plenty of information on your topic by searching > the internet. You can also search through the MATLAB File Exchange <http://www.mathworks.com/matlabcentral/fileexchange/loadCategory.do> > or MATLAB functions that are helpful. > > 4. Can you tell me what is wrong with the following code? (many lines > of uncommented code with no description of what it is supposed to do) > Reply: ? > > 5. Why does 1 not equal 1? (or any other equality comparison using > floating point numbers) This must be a bug in MATLAB. > Reply: ? > > 6. How come The Mathworks employees haven't responded to my post? > (Or) I posted this request an hour ago, why hasen't anyone answered > it yet? > Reply: ? 7. Why doesn't the MCC compiler speed up my code? Reply: Matlab is a lab tool intended to test ideas quickly. To that end, lots of programming details have been sacrificed from the language, that makes it all but impossible to compile it. The MCC compiler basically wraps the matlab interpreter around your m or p code to make it run independently of matlab. 8. How can i vectorize my code to make matlab run faster? Reply: Matlab is a lab tool intended to test ideas quickly. To that end, certain program run-time details have been over-simplified at the expense of run-time perfomance. As long as you have a double-nested for-loop, you may be able to obtain some run-time improvement. Be aware, though, that this performance is obtained at the cost of increased memory usage. Rune
From: Loren Shure on 13 Sep 2006 12:57 Rune Allnor wrote: > Duane Hanselman skrev: >> Here's a list of most annoying cssm posts. (Started in a different >> thread.) Please add yours as well as suggested replies. I'd like to >> keep this around so annoying posts can get quick "cut and paste" >> answers. >> >> 1. Please give me my plp. >> >> Reply: <http://www.mathworks.com/support/solutions/data/1-16LU2.html?solution=1-16LU2> >> >> 2. I have homework due tomorrow. Can you tell me how to do it? >> >> Reply: The folks here at cssm are busy professionals. We generally do >> not do homework for others because we did ours when we were in >> school. If you show us what you have done so far and ask a specific >> question about it, you may get debugging help. >> >> 3. I'm new at MATLAB and I'm doing a project on "some topic name". >> Please send me anything you have. >> (Or) I'm doing graduate research on "some topic name". Please send me >> the code (so I can my degree). >> >> Reply: You can find plenty of information on your topic by searching >> the internet. You can also search through the MATLAB File Exchange <http://www.mathworks.com/matlabcentral/fileexchange/loadCategory.do> >> or MATLAB functions that are helpful. >> >> 4. Can you tell me what is wrong with the following code? (many lines >> of uncommented code with no description of what it is supposed to do) >> Reply: ? >> >> 5. Why does 1 not equal 1? (or any other equality comparison using >> floating point numbers) This must be a bug in MATLAB. >> Reply: ? >> >> 6. How come The Mathworks employees haven't responded to my post? >> (Or) I posted this request an hour ago, why hasen't anyone answered >> it yet? >> Reply: ? > > 7. Why doesn't the MCC compiler speed up my code? > > Reply: Matlab is a lab tool intended to test ideas quickly. To that > end, > lots of programming details have been sacrificed from the language, > that > makes it all but impossible to compile it. The MCC compiler basically > wraps the matlab interpreter around your m or p code to make it > run independently of matlab. > > 8. How can i vectorize my code to make matlab run faster? > > Reply: Matlab is a lab tool intended to test ideas quickly. To that > end, > certain program run-time details have been over-simplified at the > expense of run-time perfomance. As long as you have a double-nested > for-loop, you may be able to obtain some run-time improvement. > Be aware, though, that this performance is obtained at the cost of > increased memory usage. > > Rune > Here's a link to a tech note on vectorization: http://www.mathworks.com/support/tech-notes/1100/1109.html and here's a link to some new 2006b doc on floating point accuracy: http://www.mathworks.com/access/helpdesk/help/techdoc/matlab_prog/index.html?/access/helpdesk/help/techdoc/matlab_prog/f2-98645.html -- --Loren http://blogs.mathworks.com/loren/
From: Christopher Hulbert on 13 Sep 2006 13:07 Duane Hanselman wrote: > Here's a list of most annoying cssm posts. (Started in a different > thread.) Please add yours as well as suggested replies. I'd like to > keep this around so annoying posts can get quick "cut and paste" > answers. > > 1. Please give me my plp. > > Reply: <http://www.mathworks.com/support/solutions/data/1-16LU2.html?solution=1-16LU2> > > 2. I have homework due tomorrow. Can you tell me how to do it? > > Reply: The folks here at cssm are busy professionals. We generally do > not do homework for others because we did ours when we were in > school. If you show us what you have done so far and ask a specific > question about it, you may get debugging help. > > 3. I'm new at MATLAB and I'm doing a project on "some topic name". > Please send me anything you have. > (Or) I'm doing graduate research on "some topic name". Please send me > the code (so I can my degree). > > Reply: You can find plenty of information on your topic by searching > the internet. You can also search through the MATLAB File Exchange <http://www.mathworks.com/matlabcentral/fileexchange/loadCategory.do> > or MATLAB functions that are helpful. > > 4. Can you tell me what is wrong with the following code? (many lines > of uncommented code with no description of what it is supposed to do) > Reply: ? > > 5. Why does 1 not equal 1? (or any other equality comparison using > floating point numbers) This must be a bug in MATLAB. > Reply: ? > > 6. How come The Mathworks employees haven't responded to my post? > (Or) I posted this request an hour ago, why hasen't anyone answered > it yet? > Reply: ? Why does Matlab not work on <architecture> * AMD 64 - Link to suggestions about LD_ASSUME_KERNEL, BLAS, etc. * Intel Macs - R2007a? certainly the AMD 64 gets a lot of traffic
From: Scott Seidman on 13 Sep 2006 13:06
"Rune Allnor" <allnor(a)tele.ntnu.no> wrote in news:1158155787.108329.267460 @p79g2000cwp.googlegroups.com: > 8. How can i vectorize my code to make matlab run faster? > Back in the day before JIT optimization, vectorization made a HUGE difference, and these threads were very interesting as they often involved issues of best coding practice specific to Matlab. Today, it's not so important, but vectorization can also make code much more readable-- of course, it could also make code much more cryptic. I don't disagree with Matlab intended to be a fast prototyping tool, but I don't agree that this was necessarily it's major design issue, and matlab certainly satisfies the needs of many that go far beyond this use. -- Scott Reverse name to reply |