Re: How can I reduce the frequency of a sine wave tia

[Murray Eisenberg]

Do you want to superpose another frequency to get a single signal, or
just plot another frequency along with the one you started with?

Compare these:

Plot[Sin[10x]+Cos[3x],{x,0,2Pi}]
Plot[{Sin[10x],Sin[3x]},{x,0,2Pi}]

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
>

--
Murray Eisenberg mur...@math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower phone 413 549-1020 (H)
University of Massachusetts 413 545-2859 (W)
710 North Pleasant Street fax 413 545-1801
Amherst, MA 01003-9305

[Bob Hanlon]

Modulate and filter the signal

a = Sin[f1* x];

b = Cos[(f1 + f2)*x];

c = -2*Select[
a*b // TrigToExp // ExpandAll,
FreeQ[#, f1, 4] &] // FullSimplify

sin(f2 x)

Bob Hanlon

---- Rick T <ratu...@gmail.com> wrote:

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