2007-01-17 07:42:45 · 3 answers · asked by Zefram 2 in Science & Mathematics ➔ Engineering
Matlab has built in utilities that could be used for it, but I wouldnt.
Think about what you are doing. You are asking for trouble.
You know how polynomial fits on the wrong kind of data explode during interpolation? Consider fitting a 9th order evenly spaced polynomial to a bell curve. The higher the order of the polynomial the more extreme the "blow-up" at th edges. If you want any kind of fit then the order of the poly should be about the number of points in a slice of the surface, or on the order of 1000 for a typical picture. The blow-up between points, especially with the highly noisy data of a picture, is bad.
Option: piecewise lower order polynomials - 2d spline fit.
Matlab has this beautiful command "interp2" that with the "pchip" does very nice picture expansion, though dont try to increase the point-count along the slice-lines by more than about 5 or you get polynomial noise anyway. I think that for that function, the source code is available (but copyright) in matlab. It might exist in an open-source for as part of an open-source toolbox for matlab, or as a part of octave.
2007-01-17 11:28:27 · answer #1 · answered by Curly 6 · 0⤊ 0⤋
Yea I read some of your last source one just before. It does look kinda cherry picked for just the two pics and graphs that he could lambast. Then he comes with that update update update and says they modify the data from a site nearby that conforms. So who is gonna know what is real anymore? Not really Bob if they all wasting so much time refuting a simple TV weather head who ain't even published and just got pic's. Seems like the poor fool has stirred a big pot if all them Official Scientists is after him. I was just browsing the NASA site ( don't ask me to find it cause I was looking at solar minimums and sunspot prediction and got all lost) Bob at the bottom of one of them long winded pages they up and said no way should anybody believe them homemade weather stations period They got satellites. I'm inclined to agree as I knew the drunk in my hometown who ran one, O'course on another page they said TOM's satellite was broke and tumbling in space but they had corrected all the data like yall tell me all the time.
2016-05-24 00:56:06 · answer #2 · answered by Anonymous · 0⤊ 0⤋
"Whatcha" building there..Something for Dupont or ?..There might be some people that don't want you having this info. What then.?
2007-01-17 09:06:21 · answer #3 · answered by Anonymous · 0⤊ 1⤋