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Results
Choice Votes   Percent
Yes 62 34.1%   
No 120 65.9%   

Survey posted 2003-06-06 23:32 by Henrik.

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I can't reproduce the 3D graph in the ticalc.org logo.
Charlemagne  Account Info
(Web Page)

No because:
-I don't have that calculator
-I don't know anything about 3D graphing

What about 3D Graph for the 83+? Can you make it on there? Someone? Anyone?

Reply to this comment    7 June 2003, 00:00 GMT


Graph3
Halfmoon Account Info
(Web Page)

Yes, there is a FLASH application that can be used on the TI-83 Plus. It works pretty well and is very fast, but it has crashed my calc a few times :-)

Anyway, see URL above, or:
http://www.detachedsolutions.com/graph3/

Reply to this comment    7 June 2003, 01:35 GMT

 
no_one_2000_  Account Info
(Web Page)

He knows about Graph^3, I think he was asking if it were possible to make the same graph on the TI-83+ with Graph^3, which I assume is possible, if the equations were the same, and you got the same perspective on the graph...

Reply to this comment    7 June 2003, 17:10 GMT

Re:  
Charlemagne  Account Info
(Web Page)

Thanks, no_one, you're right!
Yes I know of Graph3D and have it on my calc. Just wondering what the equation is.

Reply to this comment    8 June 2003, 19:20 GMT


Re: Re:  
no_one_2000_  Account Info
(Web Page)

Me too... every time somebody comes up with one that works, somebody else says that it doesn't... LOL

Maybe if I keep on looking down, somebody will have gotten it :)

Reply to this comment    9 June 2003, 22:30 GMT


Re:  
JcN  Account Info

Um...just how did you get the Subject line to be blank?

Reply to this comment    14 June 2003, 05:47 GMT


 
no_one_2000_  Account Info
(Web Page)

Great! I'm glad somebody noticed!!!!

Hint:  

Reply to this comment    14 June 2003, 18:26 GMT


 
BlackThunder  Account Info
(Web Page)

It shows up as a "?" on my other browser, for some reason.

Reply to this comment    15 June 2003, 17:55 GMT

OMG! OMG! OMG!
RCTParRoThEaD_ Account Info
(Web Page)

OMG! A DS application that ACTUALLY CRASHES???? *PANIC*

Reply to this comment    7 June 2003, 20:54 GMT


Re: Graph3
JcN  Account Info

What exactly did you do to get it to crash?

Reply to this comment    8 June 2003, 07:17 GMT

Re: Can you reproduce the 3D graph in the ticalc.org logo?
Soth  Account Info
(Web Page)

Not on my 82 strangely.

But it seems to be a 3D sinc() graph.

(sinc(x) = sin(x) / x). I only found this out about one week ago. Such a strange coincidence that the question is asked now...

Reply to this comment    7 June 2003, 00:12 GMT


Re: Re: Can you reproduce the 3D graph in the ticalc.org logo?
BLAlien  Account Info

May I ask what sinc(x) is?

Or, even better, can you convert the equation to find z in terms of x and y?

BL Alien

Reply to this comment    7 June 2003, 01:53 GMT

I can reproduce the 3D graph in the ticalc.org logo
Daniel DeGraaf  Account Info

change x to sqrt(x^2+y^2)
the range appears to be -3*pi to 3*pi in both x and y

Reply to this comment    7 June 2003, 04:18 GMT


Re: I can reproduce the 3D graph in the ticalc.org logo
Soth  Account Info
(Web Page)

or in reply to the comment that will be just under this for a short time.....

sinc((x^2+y^2)^.5)

It must be a good half year sinse I did any 'maths' other than the useful variety.

Reply to this comment    7 June 2003, 12:23 GMT


Re: Re: I can reproduce the 3D graph in the ticalc.org logo
Soth  Account Info
(Web Page)

or even....
sinc(|x+y|)

Reply to this comment    7 June 2003, 12:29 GMT


Re: Re: Re: I can reproduce the 3D graph in the ticalc.org logo
jrock7286  Account Info

Did you do that change in your head? Because those two equations are not equivalent...You CANNOT idstribute a square root to sums!

Reply to this comment    7 June 2003, 23:54 GMT


Re: Re: Re: Re: I can reproduce the 3D graph in the ticalc.org logo
Soth  Account Info
(Web Page)

|x| is the modulus / magnitude of x.

for example using complex....
a+jb can be shown as re^o (r times e power theta.)
where
r = |a+jb| = (a^2 + b^2)^(1/2)
o (theta) = arctan(b/a)

or a more basic one
|-x| = x

so |x+y| means the magnitude of the two. Treated just like complex values. I was assuming that people wouldn't just add the two independent values together then remove any minus.

....Engineers spend most of there time in an imaginary world....

Reply to this comment    8 June 2003, 00:44 GMT


Re: Re: Re: Can you reproduce the 3D graph in the ticalc.org logo?
Soth  Account Info
(Web Page)

Right then sinc was explain in my post for 2D draw it and you will see what I mean
[sin(x)]/[x]
[] are used just to show two seperate parts of the equation.

as to 3D well then,
try

sinc(x) + sinc(y)
sinc(x) + cosc(y)
(assuming cosc follows same rule as sinc)
sinc(x+y)
sinc(x^2+y^2)
sinc(x/2+y/2)

or various combos. Can't test it myself I don't have a 3D graphing calc, or Matlab. Last ones are most likely to be correct.

Tell me your results could you old bean.

Reply to this comment    7 June 2003, 12:20 GMT


Re: Re: Re: Re: Can you reproduce the 3D graph in the ticalc.org logo?
jrock7286  Account Info

I don't think you ever answered his question: WHAT IS SINC (and cosc now...)????

Reply to this comment    7 June 2003, 23:56 GMT


Re: Re: Re: Re: Re: Can you reproduce the 3D graph in the ticalc.org logo?
Soth  Account Info
(Web Page)

Read the first line.
And, if that taxes you too much then skip reading that and read the first post of mine.
And, if you are still, for some unnecessary reason, unable to do that, then I shall say it in very, and I shall emphasise the word <em>very</em>, capital letters.

SINC (X) = ( SIN (X) / X )

see I even added some spaces to make it REALLY CLEAR.
Now have I answered his question?

As to what cosine is, it is about half pi radians ahead of sine.

The equation is, I believe,

apple = sinc [(orange^2 + banana^2)^(e^-693147181n)]
where the suffix 'n' means 'nano'.
And, Pie is very tastey and is exactly equal to 9,
and a square Pie is exactly equal to 81.
(
9 = 8.539734233
81 = 72.92706059
10 = 2
bed = calling me
)


(Sorry about the tags earlier but they had to be used)

Reply to this comment    8 June 2003, 01:07 GMT


Re: Re: Re: Re: Re: Re: Can you reproduce the 3D graph in the ticalc.org logo?
JcN  Account Info

Get some sleep then! You're posting nonsense!

Reply to this comment    8 June 2003, 07:21 GMT


Re: Re: Re: Re: Re: Re: Re: Can you reproduce the 3D graph in the ticalc.org logo?
Soth  Account Info
(Web Page)

No. All of that is perfectly logical.

Remembering that 3 is a pretty good approximation for pi, and it will do for a rough approximation for e.

Reply to this comment    8 June 2003, 12:55 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Can you reproduce the 3D graph in the ticalc.org logo?
JcN  Account Info

I was referring to paragraph 7 and on :p

Reply to this comment    9 June 2003, 06:41 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Re: Can you reproduce the 3D graph in the ticalc.org logo?
Soth  Account Info
(Web Page)

p7 - is that the equation bit?
Because it isn't nonsense, not really. Apple is just a label and so is x, etc.
The rounding certain values to different values is more then legit. (and 10 = infinity = 2, but that is a long story dating back to school days and graphing calcs.)

Reply to this comment    9 June 2003, 18:04 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Can you reproduce the 3D graph in the ticalc.org logo?
Joe B  Account Info

actually 1=0=infinity
it is the truth

Reply to this comment    9 June 2003, 23:50 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Can you reproduce the 3D graph in the ticalc.org logo?
Soth  Account Info
(Web Page)

Exactly, and 1 = 2 as well. Isn't maths a fun thing to play with.

Reply to this comment    10 June 2003, 02:49 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: 1=2=0=infinity
LordScorpo  Account Info

Actually, theoretically speaking, if you use the old fashioned way of thinking, and declare 1=2, you could prove this by stating that o=1, n=1, and e=2, or any combination of three numbers, when multiplied, equals 2. that would make the statement 1=2, or one=2 correct. Also, the same can be flipped, and said the other way. All you have to do is make sure that the variables you assign for the letters of the phoenetic spelling of the number multiply out to the value on the other side of the equation.

Now, if we think further into the topic, we can theoretically disprove that statements can be false. All we would have to do is break up all the numbers into letters, assign variables to the numbers so that the equation is balanced. Here is an example.

Dog = Cat

Well, if we say the following,

D=t
g=a
o=C

Then the statement Dog = Cat is true and correct. This can also apply to nonmatching variable numbers like the following example.

Cat = Mouse

Well, there are more letters in Mouse than there are in Cat, but by using the following table of values, this can be proven correct.

C=1 M=5
a=20 o=2
t=5 u=1
s=100
e=0.1

These values will prove that Cat does indeed equal Mouse.

Reply to this comment    11 June 2003, 04:35 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: 1=2=0=infinity
Soth  Account Info
(Web Page)

x = 1, y = 1

x = y
xy = y^2
xy - x^2 = y^2 - x^2
x(y - x) = (y + x)(y - x) ; divide both by (y - x)
x = y + x
1 = 1 + 1
1 = 2

(Obviously there is a slight flaw to the logic, in that if you divide something by zero it ceases to exist, and y - x must always be zero. But it is an ammusing 'proof' anyway.

2 = infinity....
you have a square wave with period 4secs.
to find the Fourier transform you multiply by a value and integrate over infinity. But as the wave only exists for four seconds you only need to integrate between -2 and 2. (so 2 = infinity).

Reply to this comment    11 June 2003, 13:18 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: 1=2=0=infinity
JcN  Account Info

if x = y = 1, then y-x = 0, and you can't divide by 0 :p

Reply to this comment    14 June 2003, 05:50 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: 1=2=0=infinity
JcN  Account Info

Well, technically you CAN divide by 0, but if and only if this is true:

If a/b = c implies c*b = a and c*b = a implies a/b = c, then a = b = c = 0 is a solution.

This is the only time in math where dividing by 0 gives a valid solution.

Reply to this comment    14 June 2003, 05:54 GMT

Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: 1=2=0=infinity
Soth  Account Info
(Web Page)

You can always divide by zero. But that part of the equation just ceases to exist, bit of a shame. even 0 / 0 ceases to exist.

NB 1/x -> infinity
as x -> 0

However the situation 1/0 does not give an answer of infinity, just for those who thought it does.

*amusing (two posts up)

Reply to this comment    14 June 2003, 11:10 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: 1=2=0=infinity
JcN  Account Info

So if 1/x -> infinity where x=0, would y/x -> (infinity + y) if y were any number because 0*infinity = 1?

Reply to this comment    14 June 2003, 17:10 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: 1=2=0=infinity
Soth  Account Info
(Web Page)

No No No.
1/x tends to infinity as x tends to zero.
1/x doesn't exist when x is zero.
zero multiplied by infinity is zero not one.
Infinity means everything Infinity + Y therefore is nonsense, Y no longer exists as a seperate entity, it is part of infinity.
Zero is nothing, zero amounts of everything is nothing.

z(in) = z(0)[z(L) + jz(0)tan(Bl)] / [z(0) + jz(L)tan(Bl)]

if z(L) = inf. seperate z(0) disappear.
z(in) = z(0) / j tan(Bl)
j being the imaginary part of the complex number (a+jb)

there are some proofs in integration that show dividing by zero != infinity, but actually is nothing (zero)
1 / infinity is close to zero, but isn't ever going to quite be zero. It is mearly an approximation.

Reply to this comment    15 June 2003, 13:06 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: 1=2=0=infinity
Joe B  Account Info

actually you should be able to divide by 0. if any number divided by itself equals 1.. then 0/0 should equal 1.

also.. try 0^0 on your calculator :S

Reply to this comment    14 June 2003, 22:52 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: 1=2=0=infinity
Soth  Account Info
(Web Page)

A calculator is told x^0 = 1. so if the power is zero the calc will ignore the x whether it is zero or not.

nothing divided by nothing is still nothing, not one. Zero is better thought of as a quantity not a mathematical number / symbol.

If the universe were to follow all these silly little theories people come up with we would cease to exist.

And, on the funnier side.
I spell words as I pronounce them in my head.
I have just tried spelling zero as thero...
...I have a pen between my teeth. Now that is wierd.

Reply to this comment    15 June 2003, 13:10 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: 1=2=0=infinity
no_one_2000_  Account Info
(Web Page)

LOL :)

I always thought that 0/0 could be anything, since you can multiply anything by zero and still end up with zero... (If that sounded dumb (which, it probably did), then I meant like 6/3=2 because 2*3=6)

Zero is weird

Reply to this comment    15 June 2003, 17:42 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: 1=2=0=infinity
no_one_2000_  Account Info
(Web Page)

I've seen that one before :) I stumped a lot of people with it at school LOL

Reply to this comment    14 June 2003, 18:28 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Can you make this subject line longer?
slimey_limey  Account Info
(Web Page)

Sometimes my math teacher uses beer and grandma. not the words, but pictures of the objects. A beer can and a grandma.

Reply to this comment    13 June 2003, 21:26 GMT


Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Can you make this subject line longe
Soth  Account Info
(Web Page)

What does he use the pictures for?
If you drink to much of this you will look like this when you are 40.

Or, if you spend money on this now, when you are one of these you won't have any to spend on your heating bills. Because there won't be a pention. And, I am not in the slightest bit disgust with the way this country is run. Honest.

Or, does...
beer = Dear old Grandmama.

Reply to this comment    14 June 2003, 01:20 GMT

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