20,836 reputation
42568
bio website none
location Ann Arbor, MI
age 76
visits member for 2 years
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 its classical Greek synthetic form and in its more modern analytical/transformational form.


2d
comment Importing data from files designated in an InputString dialog box
I do not think this question should be closed. It does not exhibit a trivial mistake nor will a useful answer be easily found in the documentation. This question brings up some serious issues concerning how to work with InputString and Import and how to defend against bad input from a user.
2d
comment Frontend: Adding cell-type choices to the “Choose how to enter input” drop-down
@rdjain1. If you are willing to accept the shortcuts as assigned, you won't need to define a new stylesheet, but if you want to change the assignments to move a shortcut from a style that has one, which you don't use, to style, which doesn't have one that you do use, you will have to derive a new new style sheet or modify the built-in one.
Oct
26
comment Second order differential equation with boundary conditions solving repeatedly
1) ClearAll; accomplishes nothing; maybe you want Clear["Global*"]. 2) Each of your definitions of pcw` overrides the previous one, so that only the last definition pcw[x_] := (W + x)/(2*W) remains in effect at the end. Did you intend that?
Oct
26
comment Poets of the 19th century
@belisarius. Don't think Joe Stalin qualifies. His poetic work was confined to the 20th century.
Oct
26
comment Poets of the 19th century
Love the title.
Oct
24
comment Fourier series on Wolfram alpha
Try asking on the Wolfram Community site
Oct
24
comment Fourier series on Wolfram alpha
This question appears to be off-topic because it is not about Mathematica or any of the other Wolfram Research software for which questions are accepted on this site. (Questions about Wolfram|Alpha are not accepted here.)
Oct
24
comment Iterations with Table?
This question appears to be off-topic because it is not formulated in English.
Oct
24
comment Make a series of points curl
An aside: instead of typing out a list of regularly spaced vectors along the x-axis, consider pts = Array[{#, 0, 0} &, 5];
Oct
21
comment Parametric Plot 3D won't show up
The form of the 1st argument is wrong for ParametricPlot3D. It should have the form {fx, fy, fz}, not {implicit-equation, fy}
Oct
20
comment How to use a C compiler without having SystemModeler
I have no knowledge of the Windows platform. I make no recommendation.
Oct
20
comment How to use a C compiler without having SystemModeler
Yes, you must have a C compiler install on your system to use it.
Oct
20
comment How to use a C compiler without having SystemModeler
You do not need SystemModeler to compile code in Mathematica.
Oct
20
comment How to fix the order in which text appears in an axis label (V7)
As nobody has mentioned the elephant in the room, I will. You have expressed your label text as a multiplication and Mathematica is doing its normal lexical reordering on it.
Oct
20
comment Equation of a transformed (roatted) ellipsoid
I am having trouble with trying to understand what you are asking. 1) you use left-handed coordinate system in your diagram. This in not consistent with Mathematica's way of plotting with a right-handed coordinate system. 2) You ask about doing a rotation about the y-axis, but your diagram shows a translation along the x-axis. 3) you introduce a parameter h in you volume expression without explanation or defintion.
Oct
18
comment Rationalize complex numbers
Seeing as 4/3 + I N[ Sqrt[2]/3] is immediately and automatically converted to 1.33333 + 0.471405 I, I don't see how it can be done.
Oct
18
comment How to tell Eigensystem the type of the elements comprising a matrix I would like to diagonalize
Your gravatar is a near-twin of mine. I am surprised I never noticed this before since you have been participating in Mathematica.SE for well over a year. However, I only noticed now when I saw my gravatar next to yours after editing this question.
Oct
18
comment create a function that converts a character string consisting of lowercase letters of the english alphabet to a number
The English alphabet has 26 letters, so how does z end up getting assigned 27?
Oct
17
comment What is the best way to flatten a linked list with lists as values?
+1 Your answer is very enlightening. The test I referred to in my comment to the question only looked at ways of flattening the usual linked lists. Flatten and Partition are still good for that. I didn't think to use a bag because I didn't know that bags existed in Mathematica. I would have happily used your AngleBracket idea had I been clever enough to think of it.
Oct
17
comment Request for clarification of Eigensystem::eivn message
You have asked and answered enough questions on this site that you should be aware of the norms for formatting posts that are expected here. Please do a better job of formatting your posts in the future.