16,783 reputation
41959
bio website none
location Ann Arbor, MI
age 76
visits member for 1 year, 9 months
seen 8 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 the classical Greek synthetic form and in the more modern analytical form.


9h
revised How can I graph an equation with five variables?
Explained why my approach is efficient
9h
answered How can I graph an equation with five variables?
9h
revised How can I graph an equation with five variables?
deleted 2 characters in body; edited title
9h
revised Why does Assuming[…] work in one case but not in another?
Major clean-up
10h
revised An argument pattern that my function can treat as Times[constant, variable]
Moderate clean-up
1d
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.
1d
revised NDSolve fails to solve vector-valued function x'[t] == a . x[t] + u . b
Improved formatting
1d
reviewed Close Export Plot to formatted data file
1d
reviewed Close Change the size of a graphic inside a legend
1d
reviewed Close Calculating power spectral density
1d
reviewed Leave Closed How to make equidistant or split ListPoint
1d
revised How to know at which point of a calculation I am while using Table
added 3 characters in body; edited tags
1d
answered How to know at which point of a calculation I am while using Table
1d
reviewed Leave Open How to know at which point of a calculation I am while using Table
1d
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.
1d
answered Need help in understanding code
1d
revised Need help in understanding code
added 8 characters in body
1d
revised Need help in understanding code
Moderate clean-up
1d
revised Calculating power spectral density
Moderate clean-up
1d
reviewed Close How to automatically plot asymptotes?