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location Ann Arbor, MI
age 76
visits member for 1 year, 9 months
seen 7 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.


Jun
28
reviewed Looks OK Compute Triple Integral on spherical coords
Jun
28
revised Output of mathematica. Quaternion to Matrix
Improved formatting
Jun
28
comment Output of mathematica. Quaternion to Matrix
Let us continue this discussion in chat.
Jun
28
comment Output of mathematica. Quaternion to Matrix
The images of code you show are not standard Mathematica as of V9.0.1. Have you loaded some third-party package?
Jun
28
comment Output of mathematica. Quaternion to Matrix
Your question, as it now appears, is too vague. I can not determine from it what kind of an answer would satisfy you. You need to do more work up front before asking. A potential answerer needs to know what you already know about the problem, what exactly is giving you trouble, and what kind of an answer will work for you.
Jun
28
revised How to create a writable and clearable symbol?
edited title
Jun
28
comment Output of mathematica. Quaternion to Matrix
This question is ill posed. We expect those who ask questions here to be familiar with the basics of Mathematica. You really aren't not ready to work with quaternions in Mathematica if you don't understand lists and how matrices are represented as lists of lists. I'll add this piece of advice: be cautious about using MatrixForm. It is a formatting function intended for pretty printing output. You can't compute with quantities wrapped in MatrixForm.
Jun
28
revised How to work with quarternions in Wolfram Mathematica?
edited title
Jun
28
reviewed Approve suggested edit on Coordinates for multiple countries
Jun
28
reviewed Approve suggested edit on Failure of CountryData due to connectivity?
Jun
28
revised How to work with quarternions in Wolfram Mathematica?
edited title
Jun
28
answered How to work with quarternions in Wolfram Mathematica?
Jun
28
revised EndOfFile error
Improved formatting
Jun
28
answered EndOfFile error
Jun
28
revised How to select elements in a tensor conditional upon their indices
deleted 30 characters in body
Jun
28
comment Duplicated output from chemical curated data
It is good that you have found the answer to your question, but you should remove it from the question and make it an answer. Answering one's own question is not only allowed, it is encouraged.
Jun
28
revised Duplicated output from chemical curated data
edited tags
Jun
28
reviewed Looks OK Position of Subsets in a List
Jun
28
revised Define an operator with commutative, associative and distributive properties
Improved formatting
Jun
28
reviewed Close How can I compute a functional derivative of a composed function?