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Retired

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Mainly retired from Eastman Kodak. (Of course, Kodak itself is now semi-retired. I don't think I had any influence in that.) I still write MATLAB code as I find something interesting, and I do attempt to write new tools to put on the File Exchange when I think I can make a contribution.

However, I DON'T answer direct e-mail questions, and I do NOT do homework. In general, your homework is YOUR problem, not mine. Please do NOT e-mail me with your homework problems or student projects. If I was willing to answer your questions, I would very rapidly become overwhelmed, because one question is never just one simple question.

When I'm not doing something with MATLAB, you might find me playing bridge, either in the club or online on BBO.

Professional Interests: MATLAB, numerical analysis, mathematical modeling

Avocational interests: Bridge, woodworking, woodturning

Professional Interests

Bridge, MATLAB, numerical analysis, mathematical modeling

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John D'Errico submitted Solution 11471 to Problem 10. Determine whether a vector is monotonically increasing

on 14 Jan 2013

John D'Errico submitted Solution 11470 to Problem 10. Determine whether a vector is monotonically increasing

on 14 Jan 2013

John D'Errico submitted a Comment to Problem 106. Weighted average

As the others have said, the problem title is flat out wrong. What is required is simply not a weighted average in any standard form.

on 17 Feb 2012

John D'Errico submitted Solution 34662 to Problem 25. Remove any row in which a NaN appears

on 9 Feb 2012

John D'Errico submitted Solution 25497 to Problem 6. Select every other element of a vector

on 2 Feb 2012

John D'Errico submitted Solution 22539 to Problem 2. Make the vector [1 2 3 4 5 6 7 8 9 10]

on 1 Feb 2012

John D'Errico submitted a Comment to Solution 11489

Of course, this solution, while short, is NOT the best solution! Clearly the best solution is the far more efficient: n*(n+1)/2

on 28 Jan 2012

John D'Errico submitted Solution 11484 to Problem 3. Find the sum of all the numbers of the input vector

on 28 Jan 2012

John D'Errico submitted Solution 11482 to Problem 14. Find the numeric mean of the prime numbers in a matrix.

on 28 Jan 2012

John D'Errico submitted Solution 11471 to Problem 10. Determine whether a vector is monotonically increasing

on 28 Jan 2012

John D'Errico submitted Solution 11470 to Problem 10. Determine whether a vector is monotonically increasing

on 28 Jan 2012

John D'Errico submitted a Comment to Solution 11462

Of course, c = a+b; is entirely correct, using the operator form for addition. plus(a,b) uses the function form.

on 28 Jan 2012

John D'Errico submitted Solution 11457 to Problem 17. Find all elements less than 0 or greater than 10 and replace them with NaN

on 28 Jan 2012

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