On Mon, 27 May 2013 14:36:24 +0000, Danny D wrote:
BTW, I don't think I've *ever* needed Calculus in my
For example, I've never taken the derivative of
anything in order to do something; nor have I calculated
the integral of anything for practical purposes.
I'm sure *you* have, given your theoretical &
practical background; but I just never needed it.
Still, it's nice to know the simplest things, e.g.,
the integral is the area under the curve and the
derivative is the change of the output given a
change in (usually) time.
That's just about all *I* need to know about Calculus
(but now we're straying far too much away from the topic).
On Sun, 26 May 2013 21:51:07 -0700, DD_BobK wrote:
BTW, on purpose, I had purposefully described the Fourier series,
and not the Fourier transform (which converts that series into an
And you didn't even mention that!
It was a test. Just like yours.
On Mon, 27 May 2013 23:30:50 -0700, DD_BobK wrote:
Naah. All I know about the Fourier series is that this
Frenchman figured out that every periodic wave was composed
of just sine waves of various frequencies. That's pretty
ingenious to figure out.
And, of transform, whew! It's a beast. I've never needed
it outside of academia; but it's great for an algebraic
reduction of complex differential equations. Luckily,
I only took the first year of college calculus, so we
really didn't deal with it other than theoretically.
It's used in the EE class I'm auditing though, but again,
only at the theoretical level.
Starting in the fall, I'm taking organic chemistry,
which should be a lot of fun!
On Tue, 28 May 2013 07:30:03 -0700, DD_BobK wrote:
Yes. You can't audit without being registered, and,
you must take all exams and do all homework.
The only difference is the grade is Pass/Fail
(and the fact I'm three times the age of the students,
and, often twice the age of the professor!). :)
I have one advantage over some students, in that
I have an application in mind when the professor
discusses things - and I bring that to the table.
When I show the math, I show everything, down to
the last detail - for which I've received kudos
for in these classes.
Definitions differ. When I was in college (and indeed when I was an
instructor at a different, private, college) "Pass/Fail" and "Audit"
were completely separate modes. "Pass/Fail" was as you describe.
"Audit" didn't require exams, though they were voluntary. Professors
couldn't stop someone (indeed didn't know) if someone was taking the
course "Pass/Fail" but could and certainly did, if they wanted to
audit a course.
On Sun, 26 May 2013 00:08:05 -0700, DD_BobK wrote:
You're forgetting that some people love to learn!
In fact, learning is more fun than actually doing the work.
For example, learning about how unions sealed using boss o-rings
while NPT threads seal with goop was more fun than getting that
goop all over my fingers.
Specifically, learning that the union o-rings are measured
differently than the sealing o-rings is more fun than twisting
unions together and not having them leak.
The meaning is in the learning - not in the work itself.
You're assuming facts not in evidence
"You're forgetting that some people love to learn! "
I'm a life long learner & I appreciate that in others.
It is my impression that in your case the slope of the learning curve
is so flat as to be indistinguishable from zero....
Now that Oren has divined that you are retired .....all I can say is
I never worked on a home before.
In the beginning, I rented. Later on, I didn't have the time, so I paid.
Then I left my life-long profession (good riddance) and bought a run-down
fixer-upper hidden deep in the mountains, so now I've got the three
incredible ingredients for DIY home repair:
I. An old house
II. No money
III. Lots of time!
If you didn't have the first, there'd be nothing to fix; if not the
second, I'd just pay someone else to have all the fun; and the third
is a prerequisite to spending more time learning how to do the job
than doing the job itself.
PS: The fourth thing you need is an nntp newsreader & server and
good friends who care about and understand you! :)
On Sun, 26 May 2013 21:54:03 -0700, DD_BobK wrote:
I should have been an engineer - and - have just finished
auditing a semester's worth of classes at the local college.
Passed it all (Pass/Fail grade only) and loved designing
MOSFET and BJT amplifiers; but had a tough time with poles
and zeroes.... :)
Maybe you should have been...might have injected some logic into your
problem solving methods.
Those labs & report writing can have amazing influence.
Stick with ME courses....more applicable to DIY home repair.
Though, welding, wood shop & basic electrical would be more helpful.
Systems are unstable when poles are in the right hand plane. :)
On Mon, 27 May 2013 23:45:50 -0700, DD_BobK wrote:
I have an old arc welder, and oxyacetylene tanks that I picked up
at a garage sale. It's night now, but I can snap pictures of them
in the daylight for you to see. I haven't used them though, and
I don't even know if they work. Haven't even checked the hydro
dates on the tanks - but the goal was to be able to weld when/if
I ever needed to (my steel water tanks are leaking).
Took wood shop in junior high and high school for far too many
years. Now that I'm older, I realize that it's better to take
a bunch of different classes in high school than the same class
over and over again, because you don't know what you like at that
Read all the SAMS books ages ago on basic electronics, and even
built a few 68701 Motorola microprocessor boards as a kid. This
was before PCs, of course, when you *had* to build your own
boards. But I forgot most of the assembly language stuff long
ago (load accumulator A, push and pop data off the registers,
On Sun, 26 May 2013 00:08:05 -0700, DD_BobK wrote:
You'll note that I strive to not misspell words in my posts,
and that I punctuate my sentences as well as I can - and that
all my posts are readable & responsive (if a bit verbose).
So, even if I'm asking about something as mundane as how to
properly plumb a shower stall, I take pains to use the English
language as properly as I know how to use it.
It's all part of the enjoyment of understanding what is
being said and done.
In fact, you'll notice that I even have an ancillary thread
on the English-usage newsgroups asking how the word "plumb"
came about; it's interesting that the term comes from
hanging lead balls (i.e., plumbum) on the end of a string.
Learning just *that*, was more fun than the actual plumbing
of the shower stall. :)
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