Math Is Fun Forum
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#226 2014-12-13 04:50:03
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Teach David
Know how to enter multiple lines in the same cell?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#227 2014-12-13 04:56:09
- David
- Member
- From: Bumpkinland
- Registered: 2014-04-23
- Posts: 3,164
Re: Teach David
press enter?
His dominion is an everlasting dominion, Which shall not pass away, And His kingdom the one Which shall not be destroyed.
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#228 2014-12-13 04:56:55
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Teach David
That is correct. Enter these two lines
f[11]
g[11]
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#229 2014-12-13 04:58:28
- David
- Member
- From: Bumpkinland
- Registered: 2014-04-23
- Posts: 3,164
Re: Teach David
121, g[11] is the output
His dominion is an everlasting dominion, Which shall not pass away, And His kingdom the one Which shall not be destroyed.
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#230 2014-12-13 05:03:40
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Teach David
What do you think happened, why was there not 121 twice?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#231 2014-12-13 05:06:48
- David
- Member
- From: Bumpkinland
- Registered: 2014-04-23
- Posts: 3,164
Re: Teach David
Because of the missing _
His dominion is an everlasting dominion, Which shall not pass away, And His kingdom the one Which shall not be destroyed.
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#232 2014-12-13 05:10:05
Re: Teach David
n_ is a pattern. It says give the name n to whatever is being passed to the function.
On the other hand, f[n] reffers to n only. It only works when you pass n
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#233 2014-12-13 05:10:29
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Teach David
That is correct. It is called the slot operator. Try g[n] and see what you get.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#234 2014-12-13 05:32:56
Re: Teach David
It shoukd be n^2
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#235 2014-12-13 05:35:59
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Teach David
Yes, why?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#236 2014-12-13 05:42:34
Re: Teach David
Because it was defined to be n^2
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#237 2014-12-13 05:47:17
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Teach David
Why did not 11 become 121?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#238 2014-12-13 12:47:41
Re: Teach David
Because 11 is not n. The function is defined for n only.
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#239 2014-12-13 13:29:00
- David
- Member
- From: Bumpkinland
- Registered: 2014-04-23
- Posts: 3,164
Re: Teach David
Sorry I fell asleep yesterday.
His dominion is an everlasting dominion, Which shall not pass away, And His kingdom the one Which shall not be destroyed.
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#240 2014-12-13 20:28:28
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Teach David
That is correct. So now define a function that cubes any number.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#241 2014-12-13 20:38:34
Re: Teach David
That is going to be hard
CubeMe[n_] := Times[n,Sum[(2 i + 1), {i, 0, n - 1}]]'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#242 2014-12-13 20:42:06
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Teach David
Hmmm, that is correct.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#243 2014-12-13 20:52:08
Re: Teach David
This does not work:
CubeMe[n_] :=
Times[Sum[Sin[i]^2 + Cos[Times[i, E^(I \[Pi]) + 2]]^2, {i, n}],
Sum[(2 i + 1), {i, 0, n - 1}] ]When I say
CubeMe[30]It says weird things like
900 (Cos[1]^2 + Cos[2]^2 + Cos[3]^2 + Cos[4]^2 + Cos[5]^2 + Cos[6]^2 +
Cos[7]^2 + Cos[8]^2 + Cos[9]^2 + Cos[10]^2 + Cos[11]^2 +
Cos[12]^2 + Cos[13]^2 + Cos[14]^2 + Cos[15]^2 + Cos[16]^2 +
Cos[17]^2 + Cos[18]^2 + Cos[19]^2 + Cos[20]^2 + Cos[21]^2 +
Cos[22]^2 + Cos[23]^2 + Cos[24]^2 + Cos[25]^2 + Cos[26]^2 +
Cos[27]^2 + Cos[28]^2 + Cos[29]^2 + Cos[30]^2 + Sin[1]^2 +
Sin[2]^2 + Sin[3]^2 + Sin[4]^2 + Sin[5]^2 + Sin[6]^2 + Sin[7]^2 +
Sin[8]^2 + Sin[9]^2 + Sin[10]^2 + Sin[11]^2 + Sin[12]^2 +
Sin[13]^2 + Sin[14]^2 + Sin[15]^2 + Sin[16]^2 + Sin[17]^2 +
Sin[18]^2 + Sin[19]^2 + Sin[20]^2 + Sin[21]^2 + Sin[22]^2 +
Sin[23]^2 + Sin[24]^2 + Sin[25]^2 + Sin[26]^2 + Sin[27]^2 +
Sin[28]^2 + Sin[29]^2 + Sin[30]^2)'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#244 2014-12-13 20:55:09
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Teach David
CubeMe[30]//FullSimplify
or
CubeMe[30]//N
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#245 2014-12-13 20:56:15
Re: Teach David
27000
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#246 2014-12-13 20:57:09
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Teach David
That is correct.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#247 2014-12-13 21:01:14
Re: Teach David
Thanks, now I know how to cube a number
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#248 2014-12-13 21:02:19
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Teach David
Simpler seems f[n_]:=n^3
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#249 2014-12-13 21:17:34
Re: Teach David
Wow! How did you discover that?
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#250 2014-12-13 21:27:33
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Teach David
It is a gift.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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