244 reputation
127
bio website
location
age
visits member for 2 years, 8 months
seen Apr 15 at 17:14

I'm old. I get confused. OK?


Feb
5
comment Sum of averages vs average of sums
(When I get back to work on Monday I'm going to change the logic to use double-precision on the off-chance that the problem is due to losing precision. But it seems unlikely given the data.)
Feb
4
comment Sum of averages vs average of sums
This is C code, not a spreadsheet, and the numbers are "float" values, so no blanks. Pretty sure it's not a simple bug (though it may well be some sort of conceptual problem). The "sum" of the values in a row is actually accumulated separately from/concurrently with the individual values (though a check shows they add up to equal the sum), so taking the average of the row or some such is not the problem.
Feb
3
comment Sum of averages vs average of sums
(That is, the vertical time dimension is calculated with a moving average. FWIW, the column values tend to differ by a factor of 50 or so, with one column predominating.)
Feb
3
comment Sum of averages vs average of sums
Actually, it's an exponential moving average with N of 50.
Feb
3
asked Sum of averages vs average of sums
Oct
15
accepted How to scale data for a log graph
Oct
13
answered How to scale data for a log graph
Oct
13
revised How to scale data for a log graph
added 132 characters in body
Oct
13
comment How to scale data for a log graph
That's going the wrong way.
Oct
13
revised How to scale data for a log graph
added 28 characters in body
Oct
13
revised How to scale data for a log graph
added 378 characters in body
Oct
13
revised How to scale data for a log graph
added 378 characters in body
Oct
13
revised How to scale data for a log graph
added 65 characters in body
Oct
13
asked How to scale data for a log graph
Oct
1
comment what does $-2^2$ evaluate to?
Actually, the C-based languages do not have an exponentiation operator, but use functions instead, so there would be no ambiguity. Fortran uses ** but it places that ahead of negation in precedence, and I would imagine that other languages styled after Fortran use the same precedence.
Sep
25
comment Really simple question about sine wave equation with $\pi$
Yep, assuming t is seconds, this is an equation for a sinusoidal waveform of 150Hz.
Sep
15
revised Does using an ellipse as a template still produce an ellipse?
added 2 characters in body
Sep
15
comment Does using an ellipse as a template still produce an ellipse?
@J.M -- I can't believe that I screwed up the title that badly!! I generally check spelling/wording over pretty closely, but after fixing the second "elipse" => "ellipse" I didn't look for the first, and the extra "d" must have fallen from the sky.
Sep
15
accepted Does using an ellipse as a template still produce an ellipse?
Sep
15
comment Does using an ellipse as a template still produce an ellipse?
OK, thanks. I suspected as much, but my math is weak enough that I wasn't sure. And your diagram very nicely illustrates how it breaks down.