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'[OT]It must be right, my calculator says so.'
2009\04\24@054818
by
cdb
Doing some sining and cosining (hmm cosinning interesting) and my
trusty ancient Casio fx500f informs me that the sine of 90 deg is
0.893996663, sin 45 is 0.850903524.
If anyone has a filter or waveform that isn't going to plan. just
email me the radians or degrees and my Casio will solve the problem
for you.
trigonometry inflation is running at about 20% these days, or maybe I
just need new batteries for the calculator.
This is a good reason why calculators should not be allowed in primary
school IMHO.
Colin

cab, on 24/04/2009
2009\04\24@061032
by
Picbits Sales
I take it you have your calculator set to Radians instead of Degrees ;)
Let me know if it was user error in the end ......... ;)
Dom
{Original Message removed}
2009\04\24@085011
by
cdb
2009\04\24@164400
by
John Gardner
Casio has fielded interesting calculators over the years,
notably some programmableinC models. All long gone,
AFAIK. Too bad.
Jack
2009\04\26@122225
by
Peter
cdb <colin <at> btechonline.co.uk> writes:
> Doing some sining and cosining (hmm cosinning interesting) and my
> trusty ancient Casio fx500f informs me that the sine of 90 deg is
> 0.893996663, sin 45 is 0.850903524.
Not sure what you mean, low battery will always cause trouble excepting that
most better calculators DO have a low battery indicator. Anyway don't trust your
calculator too much even with a new battery. Calculators are really 'variable'
in transcendental operation results. I only trust them after checking with an
infinite precision calculator set to a significantly higher number of digits
than those displayed by the $9 'pocket math genius'. Read more about it here:
http://www.rskey.org/~mwsebastian/miscprj/results.htm
Peter
2009\04\26@161504
by
Wouter van Ooijen
> I only trust them after checking with an
> infinite precision calculator
I wonder how that one deals with irrational numbers?

Wouter van Ooijen
 
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu
2009\04\26@174024
by
Alan B. Pearce
>> I only trust them after checking with an
>> infinite precision calculator
>
>I wonder how that one deals with irrational numbers?
I was wondering where he found one of those. ;))
2009\04\26@194747
by
cdb

:::::: I only trust them after checking with an
:::::: infinite precision calculator
::::::
:::: I wonder how that one deals with irrational numbers?
::::
:: I was wondering where he found one of those. ;))
I am of the opinion that all but integer maths are irrational and
illogical and bear no resemblance to the real world.
Give me three single stones and so long as I accept the concept of
each stone equals 1 I have no problem in realising that 3 = 3 and take
one away I now have two. BUT, tell me I have 1 stone and that if I
were to cut it into 3 I'd then have 0.33333333 of a stone recurring
forever. Well it gets worse when you tell me that if I multiply my
0.3333333 to get my whole stone back I lose 0.00000000000000000001 of
stone somewhere, this is obviously nonsense, and besides how do I know
that the dust from the stone breaking actually does represent
0.000000001 of my whole stone?
Then you have the math fidllers come along who back in the 1500's
spent 20 years scribbling all over bits of parchment and end up
fudging figures to get the results they have abitarily drawn out of
the air and then have the cheak to produce various lawas to explain
why statistically speaking if 2 + 2 doesn't equal 4.679 as they hoped,
I must ignore law number one and select law number five which will
with judicious losing bits of numbers into no mans land get the
required result.
You can tell why I detested at primary and secondary school
problematical maths, with my kind of thinking.
I am still convinced that those men who insisted on filling baths
sometimes together and sometimes individually cheated by sometimes
using hot water (which must run faster) and how did I know they were
using the same size bucket? How could I be expected to know if a train
left Crewe station at 12am and had wheels with a circumference of 2' 3
and 3/8" at what time would it meet the train from Cornwall at Eustan
Station if it was travelling at 80MPH and stopped for three minutes
once, if at the age of eight I didn't know exactly where Crewe station
was? The teacher was never impressed by my argument.
Colin

cdb, .....colinKILLspam@spam@btechonline.co.uk on 27/04/2009
Web presence: http://www.btechonline.co.uk
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2009\04\27@143737
by
Peter
cdb <colin <at> btechonline.co.uk> writes:
> I am of the opinion that all but integer maths are irrational and
> illogical and bear no resemblance to the real world.
Actually maths call natural numbers [1..infinity), integer, Natural :) Negative
numbers and zero are not a part of that set ...
Peter
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