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location Ann Arbor, MI
age 76
visits member for 1 years, 6 months
seen 5 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.


6h
comment Linear functions
@Nasser. OP probably intends F(x) = x^2/(x + 3), which is a rational function and has an oblique asymptote.
6h
comment Create a system of linear equations with an arbitrary number of variables
@kguler. Your comment illuminates an area where I lack confidence in my interpretation of the OP's post. I was thinking the OP would bind the free variable α to constrain the q[i] to be non-negative. Doing so after the equations are solved would be a lot less messy than introducing Max[0,(α - sum[m, i] - c[i])/2]] into the equations. But since I know nothing about α, I don't know whether that would work or not.
6h
comment Control which frontend session/kernel the Workbench gets attached to
For this answer to be useful, it needs to give details on how the mentioned dialog is to used.
13h
comment Is there a PrimeQ whose accuracy guarantee you can adjust?
What you are asking is a matter of on-going research since the time of the first digital computers. It is an inherently difficult problem. Even when restricted to context of Mathematica, the question is too broad. I'm voting to close it.
1d
comment Define function that goes from one point to another parametrically
Why can't you just use Line in your plot? You can insert Graphics into a plot with Prolog or 'Epilog`.
1d
comment How to Show the “TemperatureMap” using Manipulate?
I think deleting the question would be good.
1d
comment How can I plot my rather complicated function?
Please post your actual Mathematica code. Without it no one will be able to see what you might have done wrong, nor will they be able to experiment with possible repairs.
2d
comment Simplifying trig expressions containing Abs or Sqrt
@Silvia. Probably, but we can only answer on the basis of what he actually posts, right? :)
2d
comment Simplifying trig expressions containing Abs or Sqrt
The answers you say you are expecting are wrong answers.
2d
comment How to compactify a Mathematica notebook?
Look at Set and SetDelayed. Look at this answer to understand the difference between the two.
Apr
20
comment Manipulate executes twice
For your two-digit number output problem you might use Round[#., 0.01]&
Apr
19
comment Where can I find a dark stylesheet for mathematica?
Many people have their computer displays set too bright, which cause eye strain. That my be your problem. Try reducing the display's brightness.
Apr
18
comment How can I include a popup menu in my wizard's content?
I don't think you can use PopupMenu, which is not part of GUIKit, but belongs to the newer dynamic GUI tools that first appeared in V.6. I think GUIKit uses Java for its widgets, but the new GUI widgets are native to Mathematica. They can not be intermixed, at least not casually.
Apr
18
comment How to apply a free-form input Function using InputField
What happens if the user enters 42 + u^3? :P
Apr
17
comment Aligning controls and their labels to grid?
Add an empty string in position {1,3) of your slider declarations. For example, Control[{{speed, 1}, 1, 30}] becomes Control[{{speed, 1, ""}, 1, 30}]. Then no variable name will show up on the left of the slider.
Apr
17
comment Splitting a list into list of lists
What you want is Partition
Apr
16
comment draw graphics in cycle
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.
Apr
16
comment Shift text upwards in graphics so characters with descenders clear horizontal lines
@Mr.Wizard. Edited answer to add code. It was posted in the chat room where we discussed this question. Sorry I didn't think to show it.
Apr
16
comment Shift text upwards in graphics so characters with descenders clear horizontal lines
Click on the stack exchange logo on the site toolbar. On the drop down menu, click on "chat"
Apr
16
comment Shift text upwards in graphics so characters with descenders clear horizontal lines
Your sample code doesn't reproduce your problem on my system. Both h and g are aligned to same baseline, with the descender of the g going below the line. Might be good to discuss this in chat. I'll open a chat room.