Description:
Mathematica discussion group. (Moderated)
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Question about ColorFunction
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Anyone explain to me how ColorFunction works? Why Plot3D[Sin[x + y], {x, 0, 3}, {y, 0, 3}, ColorFunction -> (Hue[Sin[#1 + #2]] &)] and Plot3D[Sin[x + y], {x, 0, 3}, {y, 0, 3}, ColorFunction -> (Hue[#3] &)] return different color distributions?
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Slow Locator in Manipulate
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The following is a simple example of the use of a Locator on a graphic:
p1 = ContourPlot[
Sin[x y], {x, -3 \[Pi], 3 \[Pi]}, {y, -3 \[Pi], 3 \[Pi]},
ContourShading -> False];
Manipulate[
Show[p1, Graphics[{Red, AbsolutePointSize[5], Dynamic@Point[pt1]}],
PlotRange -> {{-3 \[Pi], 3 \[Pi]}, {-3 \[Pi], 3 \[Pi]}}],... more »
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Data of non-trivial NonLinearFit
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Sorry, the data are below....
Hi, I've got a problem with a nonlinear fit.
My function is this:
B1= a1+b1/tr+c1/tr3
B2= a2+b2/tr+c2/tr3
B3=a3+b3/tr+c3/tr3
Btot=x*B1+y*B2+z*B3
I've got two dataset (some values are given below), one containing the Btot and Tr ed one containing x,y,z. My target is to make a regression to obtain the values a,b,c of every equation using only one regression.... more »
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Fourier DFT scaling problem
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Hi all. I hope someone can help me with what seems to be a fairly elementary problem, nevertheless I have spent a good deal of time trying to come to a solution without any success. I am fairly new to the Fourier transform.
My problem is that the output of the Fourier[] command has a scaling dependency on my sampling parameters which I cannot figure out how to remove.... more »
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Non-trivial Non- linear fit
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Hi, I've got a problem with a nonlinear fit.
My function is this:
B1= a1+b1/tr+c1/tr3
B2= a2+b2/tr+c2/tr3
B3=a3+b3/tr+c3/tr3
Btot=x*B1+y*B2+z*B3
I've got two dataset (some values are given below), one containing the Btot and Tr ed one containing x,y,z. My target is to make a regression to obtain the values a,b,c of every equation using only one regression.... more »
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rHelp Finishing Mathematica Program
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With Mathematica, you probably do not need an explicit loop.
Your problem sounds like it is made to order for NestWhile. Look
at the documentation for examples.
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If I recall the ground rules for this group correctly, the
answer is you cannot do this. The best workaround is to post a... more »
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Truncated inverse Wishart distribution
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I would like to calculate the mean of a truncated inverse Wishart distribution? I.e., if B is an inverse Wishart variable, then I'd like to calculate E(B|B<W), where B<W means that W-B is positive definite.
I have the answer for the degenerate case where B and W are scalars -- that is, where B is an inverse chi-square variable and W is a scalar constant. The answer then is a ratio of gamma functions, and you can get it using the TruncatedDistribution function and the InverseChiSquareDistribution.... more »
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rHelp Finishing Mathematica Program
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This project involves finishing the Mathematica program which I
started.
A loop must be added to the program.
The trial value for k is to be replaced by the calculated value of k
and then recalculated in the loop, over and over, until the error
between the trial value of k and the calculated value of k is less... more »
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help with layman terms algorithm development?
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ok, i have a fairly simple problem, that will probably look really complicated in a computer solving algorithm. i'm not trying to implement it into mathematica yet i just want to get an idea of what it would look like in general terms
here's the problem:
you have a room that is 130 feet wide and 65 feet long... more »
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