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location Sydney, Australia
age 48
visits member for 1 year, 11 months
seen 23 hours ago

Jan
9
comment Fitting data using a differential equation
@thils, I believe you have to approximate y'[x] based on the data using finite difference coefficients. Have you considered this?
Jan
8
comment How can I define a ⊕ operator?
Thanks @rm-rf, I couldn't resist explaining this aspect of the Mathematica programming language :)
Jan
8
revised How can I define a ⊕ operator?
detailed explanation
Jan
8
revised How can I define a ⊕ operator?
added 5 characters in body
Jan
8
answered How can I define a ⊕ operator?
Jan
6
comment How can I get an approximate contour plot from a 3D plot?
Forgot to say that there is the caveat that the orientation wasn't uniform (some lines from left to right, others from right to left - kind of, you get the point) and I fixed that by hand based on my particular case.
Jan
6
comment How can I get an approximate contour plot from a 3D plot?
See this mathematica.stackexchange.com/questions/20281/…. I have used it and works.
Jan
6
revised Specific Mathematica algorithms, for example LU Decomposition
added 148 characters in body
Jan
6
answered Specific Mathematica algorithms, for example LU Decomposition
Jan
6
answered Inaccurate data range in ListPlot
Jan
6
comment Pathological behaviour when evaluating a sum
When it comes to manipulating expressions, one needs to be aware of whether a built-in has or not hold behaviour as that affects how it works. And some expression handling built-ins don't have that (notably Integrate and D), allowing you to generate a expression before handing that over to the built-in, but others do. That's the way it is.
Jan
6
revised Pathological behaviour when evaluating a sum
deleted 40 characters in body
Jan
6
answered Pathological behaviour when evaluating a sum
Jan
2
comment Estimating a distribution using binned data
IMHO this should be tackled using Bayesian estimation: take an uninformative prior, add binned data and derive a posterior dist for model parameters. I believe this is worth a research paper.
Jan
2
revised Estimating a distribution using binned data
previous thoughts
Jan
2
answered Estimating a distribution using binned data
Jan
2
awarded  Critic
Jan
1
revised Prevent graphics render inside held expression
added 9 characters in body
Jan
1
answered Prevent graphics render inside held expression
Jan
1
revised What are the most common pitfalls awaiting new users?
added 187 characters in body