m_goldberg

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31034

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	location	Ann Arbor, MI
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I am a retired software developer. I retired at the end of 2003 and since then my computer programming activities have been for recreational purposes. I find Mathematica excellent for that.

I started using Mathematica in 1997 (Ver. 3). I am currently using Ver. 9. Although I have used Mathematica for all kinds of stuff, I use it mostly to pursue my long standing interest in Euclidean geometry, both in the classical Greek synthetic form and in the more modern analytical form.

	4,764 reputation	bio	website	none	visits	member for	7 months
31034 badges		location	Ann Arbor, MI		seen	4 hours ago

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7h	comment	How to extract data of large function Your example doesn't shed much light on your problem since it is too simple to produce the problem of not being able to save it in closed form. Saving a table made with `Table[{x, f[x]},{x, Range[0., 0.5, 0.1}]` would save the information needed to do a `ListPlot` that would work for your example, but I can't decide from your question whether or not it work for your real problem.
8h	comment	How to extract data of large function This solution has a problem. It preserves the range data at the expense of the domain data. I think the OP needs a solution the preserves both.
May 18	comment	Extracting points data from a 3D curve surface? Suggest you remove the unwanted points from `x1` before you make the plot.
May 16	comment	Variable scoping problem when mapping over delayed replacement As David Carraher says, being careful with names can help in situations like this. Consider using formal symbols in your `RuleDelayed` expression.
May 15	comment	Solving for variables in a series of nonlinear equations If you have three linearly independent points giving x and y values, you can use the `Solve` function to get a solution. If you have more than three, then you will need to fit a solution with one of Mathematica's functions for fitting data to a set of parameters. Which is your situation?
May 9	comment	Simulating Queueing Disciplines in Mathematica I think this too vague and open-ended to be a good question.
May 8	comment	Correct use of ListInterpolation @user7331. It may be that `ListInterpolation` won't work for you. It's hard to say what would help because you give so little detail about your problem in your question. Have you looked at this example?
May 8	comment	Why can't I change the style of a cell repeatedly? @HyperGroups. Your comment seems to be a new question. Please ask it properly by posting it as a question, so it can be given proper attention and so people can answer it using the full facilities of Mathematica.SE
May 8	comment	How can I define a function which is the sum of other functions? Since you don't describe the failure mode when your say " ... but it doesn't work", it's hard to diagnose you problem, but here is a piece of general advice: use `U[r_] := Vhh[r] + Vch[r] + Vcc[r]`. Note the `:=` in place of `=`, it makes an important difference. And use `:=` when you define `Vhh`, `Vch` and `Vcc`, as well.
May 7	comment	What's wrong with my calculation of the expectation of the Laplace distribution? @user6932. That's only because you haven't so far made any global assignments to `x`, `mu1` or `sigma2`. But you have a time bomb ticking away.
May 7	comment	What's wrong with my calculation of the expectation of the Laplace distribution? @J.M. Sorry to spoil the joke with my edit, but I felt I had a duty to posterity.
May 7	comment	Does LinearModelFit perform an ordinary linear regression (least squares)? From ref/LinearModelFit/Properties & Relations: "`Fit` and `LinearModelFit` fit equivalent models". Form ref/Fit: "`Fit[data, funs, vars]` finds a least-squares fit to a list of data as a linear combination of the functions funs of variables vars."
May 6	comment	How to monitor the progress of Importing files? Unless you are using low-level code to read in your data and you edit this post to show that low-level code, I say your post is not a real question. So I will not vote to reopen it.
May 5	comment	How to highlight a string pattern? Please use shorter strings in your examples. There is no need to use a string of 500 characters. You could surely produce an example with 100 characters or less.
May 5	comment	Confused about Unevaluated If you interesting in how evaluation is done to extent of using `Trace`, you are ready for David Wagner's book. It will answer your question and many, many more. In particular, see Chapter 7.
May 3	comment	How to track dynamically generated manipulators? `Sequence` is not needed when there is only one control. A better example is `With[{controls = Sequence[{u, 0, 1}, {v, 0, 1}]}, Manipulate[{u, v}, controls]]`
May 3	comment	How to track dynamically generated manipulators? You really should make an attempt to reduce your problem to an example that reproduces it in far fewer lines of code.
May 1	comment	Override Equation structure change in mathematica - CopyToLaTeX Please edit your question to include an example of the expressions you are working with, including the transformed output.
May 1	comment	Adapting NDSolve to circumvent NDSolve::bdord: error for 1-D Euler Equations I find two problems with your post. First, your code is unreadable. Please format it in the normal Mathematica input form. Second, it isn't clear what kind of help you are expecting.
Apr 30	comment	How can Private functions be made completely opaque? Private means one thing from your point of view, but something else from Mathematica's, so the short answer to your question, "Can anyone help me?" is: no.