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How can I reduce the frequency of a sine wave tia sal22
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Rick T  
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 More options 7 Nov, 11:50
Newsgroups: comp.soft-sys.math.mathematica
From: Rick T <ratull...@gmail.com>
Date: Sat, 7 Nov 2009 11:50:49 +0000 (UTC)
Local: Sat 7 Nov 2009 11:50
Subject: How can I reduce the frequency of a sine wave tia sal22
Greetings All

I have the example below which produces 10 cycles
a = Sin[10 x]
Plot[a, {x, 0, 2 Pi}]

What Type of signal would I need to add/multiple/divide to reduce it's
signal/frequency to 5 cycles?  I know I can just change the number 10
to 5
but I need to combine it with another signal.  what mathematical
operation/signal do I need to use.

tia sal2


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David Bailey  
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 More options 8 Nov, 11:48
Newsgroups: comp.soft-sys.math.mathematica
From: David Bailey <d...@removedbailey.co.uk>
Date: Sun, 8 Nov 2009 11:48:04 +0000 (UTC)
Local: Sun 8 Nov 2009 11:48
Subject: Re: How can I reduce the frequency of a sine wave tia sal22
Rick T wrote:
> Greetings All

> I have the example below which produces 10 cycles
> a = Sin[10 x]
> Plot[a, {x, 0, 2 Pi}]

> What Type of signal would I need to add/multiple/divide to reduce it's
> signal/frequency to 5 cycles?  I know I can just change the number 10
> to 5
> but I need to combine it with another signal.  what mathematical
> operation/signal do I need to use.

> tia sal2

I wonder what course you are taking - do we get to share your marks!

Seriously, what is the point in asking others to do your homework!

David Bailey
http://www.dbaileyconsultancy.co.uk


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Bill Rowe  
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 More options 8 Nov, 11:54
Newsgroups: comp.soft-sys.math.mathematica
From: Bill Rowe <readn...@sbcglobal.net>
Date: Sun, 8 Nov 2009 11:54:38 +0000 (UTC)
Local: Sun 8 Nov 2009 11:54
Subject: Re: How can I reduce the frequency of a sine wave tia sal22
On 11/7/09 at 6:51 AM, ratull...@gmail.com (Rick T) wrote:

>I have the example below which produces 10 cycles
>a = Sin[10 x]
>Plot[a, {x, 0, 2 Pi}]
>What Type of signal would I need to add/multiple/divide to reduce
>it's signal/frequency to 5 cycles?  I know I can just change the
>number 10 to 5 but I need to combine it with another signal.  what
>mathematical operation/signal do I need to use.

Reduce the factor multiplying x by 2. That is

Plot[Sin[5 x], {x, 0, 2 Pi}]

has 5 cycles


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Chris Degnen  
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 More options 8 Nov, 12:06
Newsgroups: comp.soft-sys.math.mathematica
From: Chris Degnen <deg...@cwgsy.net>
Date: Sun, 8 Nov 2009 12:06:39 +0000 (UTC)
Local: Sun 8 Nov 2009 12:06
Subject: Re: How can I reduce the frequency of a sine wave tia sal22
On 7 Nov, 11:50, Rick T <ratull...@gmail.com> wrote:

> Greetings All

> I have the example below which produces 10 cycles
> a = Sin[10 x]
> Plot[a, {x, 0, 2 Pi}]

> What Type of signal would I need to add/multiple/divide to reduce it's
> signal/frequency to 5 cycles?  I know I can just change the number 10
> to 5
> but I need to combine it with another signal.  what mathematical
> operation/signal do I need to use.

> tia sal2

With a continuous, cyclic function it's a bit trivial:

a = Sin[10 x];
aim = Sin[5 x];
factor = (a + aim)/a - 1;
Plot[a*factor, {x, 0, 2 \[Pi]}]

For more complex cases you'd require deconvolution, e.g.
http://terpconnect.umd.edu/~toh/spectrum/Deconvolution.html

I'm looking forward to seeing any illustrative posts.


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