21,076 reputation
42568
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location Ann Arbor, MI
age 77
visits member for 2 years, 1 month
seen 14 hours ago

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.


Aug
1
revised How to draw a line (1D) with labeled subdivisions
Minor clean-up
Aug
1
reviewed Close Probability of xy point on bivariate normal distribution
Aug
1
revised How can I save a Manipulate's control settings to a dataset?
added 8 characters in body
Aug
1
revised How can I save a Manipulate's control settings to a dataset?
Improved formatting
Aug
1
revised How can I save a Manipulate's control settings to a dataset?
Improved formatting
Jul
31
revised How can I graph an equation with five variables?
Explained why my approach is efficient
Jul
31
answered How can I graph an equation with five variables?
Jul
31
revised How can I graph an equation with five variables?
deleted 2 characters in body; edited title
Jul
31
revised Why does Assuming[…] work in one case but not in another?
Major clean-up
Jul
31
revised An argument pattern that my function can treat as Times[constant, variable]
Moderate clean-up
Jul
30
comment NDSolve fails to solve vector-valued function x'[t] == a . x[t] + u . b
It might be worth pointing out that with coef = 0 the differential equation in question yields the trivial solution X[t_] = {0, 0, 0}. Non-zero values of coef give non-trivial solutions.
Jul
30
revised NDSolve fails to solve vector-valued function x'[t] == a . x[t] + u . b
Improved formatting
Jul
29
reviewed Close Change the size of a graphic inside a legend
Jul
29
reviewed Leave Closed How to make equidistant or split ListPoint
Jul
29
revised How to know at which point of a calculation I am while using Table
added 3 characters in body; edited tags
Jul
29
answered How to know at which point of a calculation I am while using Table
Jul
29
reviewed Leave Open How to know at which point of a calculation I am while using Table
Jul
29
comment Need help in understanding code
This question appears to be off-topic because it is too localized; i.e, it applies only to the local situation and needs of its poster and answers will not benefit others.
Jul
29
answered Need help in understanding code
Jul
29
revised Need help in understanding code
added 8 characters in body