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42571
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location Ann Arbor, MI
age 77
visits member for 2 years, 3 months
seen 29 mins 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.


Oct
3
revised Expressing a matrix in terms of four basis matrices
Routine clean-up
Oct
2
revised Resizing text with keyboard shortcuts in Mathematica 10
edited tags; edited tags
Oct
2
comment Resizing text with keyboard shortcuts in Mathematica 10
Can't duplicate the behavior you report with V10.0.1 running on OS X. The keyboard shortcuts work as expected.
Oct
2
revised Graphics3D not rendering Ball as a filled object
edited tags
Oct
2
answered Graphics3D not rendering Ball as a filled object
Oct
2
answered NIntegrate giving message NIntegrate::slwcon:
Oct
2
revised NIntegrate giving message NIntegrate::slwcon:
Routine clean-up
Oct
2
revised Sentiment analysis of tweets
Routine clean-up
Oct
2
revised Why Infinity edges with WeightedAdjacencyGraph
added 4 characters in body; edited title
Oct
2
revised Convert matrix rows into variables
added some further explanation
Oct
2
answered Convert matrix rows into variables
Oct
2
comment Convert matrix rows into variables
I have been using Mathematica for a long time, and in my experience what you are asking for indicates a need to re-think your programming strategy. In every situation I can think of, the rows of a matrix of any size can be accessed without assigning each row to a named variable.
Oct
2
revised finding eigenvectors of a n*n symbolic matrix
Improved formatting
Oct
2
comment Numerical integration with NIntegrate
@ChenStatsYu. I don't see any modified full copy to look at.
Oct
2
comment Numerical integration with NIntegrate
@ChenStatsYu. In Mathematica, integers and rationals like 1 and 1/10 are exact, and decimals such as 1. and 0.1 are by default machine floating point numbers. The latter will (usually) produce faster but less accurate calculations. It is a oversimplification, but it can be useful to think of NIntegrate as being designed to work with inexact numbers and Integrate as being designed to work with exact ones.
Oct
1
awarded  Nice Answer
Oct
1
reviewed Reviewed How to simplify symbolic matrix multiplication using the associativity of scalar multiplication?
Oct
1
revised How to simplify symbolic matrix multiplication using the associativity of scalar multiplication?
Major clean-up
Oct
1
answered Select pairs of columns from an array of data
Oct
1
reviewed No Action Needed How a novice user better understand the Q/A