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42568
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location Ann Arbor, MI
age 77
visits member for 2 years, 2 months
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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 its classical Greek synthetic form and in its more modern analytical/transformational form.


Sep
21
revised Applying N to the roots found by Solve gives complex numbers when the roots are real
deleted 3 characters in body
Sep
21
answered Applying N to the roots found by Solve gives complex numbers when the roots are real
Sep
21
revised Applying N to the roots found by Solve gives complex numbers when the roots are real
Improved formatting
Sep
21
revised Finding real roots of negative numbers (for example, $\sqrt[3]{-8}$)
deleted 4 characters in body
Sep
21
awarded  Enlightened
Sep
21
awarded  Nice Answer
Sep
21
reviewed Reopen GraphIntersection Problem
Sep
20
comment Defining a function that that evaluates a function to obtain a value not supplied as an optional argument
@Mr.Wizard. Thanks for reminding me.
Sep
20
answered Defining a function that that evaluates a function to obtain a value not supplied as an optional argument
Sep
20
revised Optimizing evaluation of expressions dependent on four variables and containing double summation
Improved formatting
Sep
20
comment Problem with NumberForm when exporting
I don't think your question has anything to do with Export. if t2 evaluated correctly, the export would have been fine. And t2 does evaluate correctly on my system, which is V10 on OS X.
Sep
20
comment Find function inverse
@Mr.Wizard. In the domain {0,1}, specified by the OP, either brach will work. The way the question is posed, makes me think the OP would be satisfied by any functional form that works in his domain, and and is not interested in the complete set.
Sep
20
comment Find function inverse
@user19754. It's not an error message. It's a warning. In the domain {0, 1}, the g is fine. In the domain x < 0, it is not valid. You can turn it off with Quiet.
Sep
20
answered Find function inverse
Sep
20
comment Defining a function that that evaluates a function to obtain a value not supplied as an optional argument
Since your question is closed, I will have to write my answer as comment, which will make it hard to read. Sorry about that. The easiest way to accomplish what you ask for requires a some rewriting, but not much. First change your current definition to CentralDifferentMethod[α_, β_, α1_, α2_, λ_, v0_, dt_, t_, uo_] := Module{...}, ... disp[0] = u0; ...] and then add a 2nd definition CentralDifferentMethod[α_, β_, α1_, α2_, λ_, v0_, dt_, t_] := CentralDifferentMethod[α, β, α1, α2, λ, v0, dt, t, u[α, β, λ]].
Sep
20
reviewed Edit and Reopen Defining a function that that evaluates a function to obtain a value not supplied as an optional argument
Sep
20
revised Defining a function that that evaluates a function to obtain a value not supplied as an optional argument
Major clean-up
Sep
20
revised How to plot a Circles-and-Squares fractal
Improved formatting
Sep
19
reviewed Approve How do I perform the following numerical integration
Sep
19
revised Better way to test that a matrix is upper-triangular?
Made English more idiomatic