Do number series represent sine wave?

[rng]

I have a set of about 1000 numbers which if plotted may produce a sine wave pattern (a series of sine waves in continuity). How can I find out if these numbers represent sine wave pattern using java?

Thanks in advance.

[KevinWorkman]

How would you do this by hand, without a computer?

[rng]

I can only think of plotting a graph and seeing it !

[JosAH]

Try an autocorrelation (google is your friend here) on the signal and the signal itself, shifted n samples. For the value of n where the correlation is at its maximum you have found the frequency of the sine, i.e. n*st where st is the sample time.

kind regards,

Jos

[rng]

Thanks. I am checking google.

[rng]

It is surprising that one needs complex programs and algorithms to identify even simple shapes. Is there any simple method to differentiate between 2 sets of points which on plotting show simple shapes of V and U respectively.

[JosAH]

It is surprising that one needs complex programs and algorithms to identify even simple shapes. Is there any simple method to differentiate between 2 sets of points which on plotting show simple shapes of V and U respectively.

Try the NN aproach (Neural Network). A BAM (Bidirectional Associative Memory) or Kohonen network are quite suitable. Hopfield networks have too low storage capacity for image recognition. Beware though: this isn't trivial and maybe, after you've struggled your way through it, you'll appreciate simple eyes and the brain's processing power ;-)

kind regards,

Jos

[rng]

Thanks for your suggestions. Can you recommend some website/software to quickly get started in using neural networks for simple problem like I stated above?

[JosAH]

Google for "character recognition Java".

kind regards,

Jos

[Tolls]

It is surprising that one needs complex programs and algorithms to identify even simple shapes.

Took evolution rather a long time to develop such pattern recognition...

[JosAH]

Took evolution rather a long time to develop such pattern recognition...

A spider can grow new lenses for their eyes overnight; I wonder why they lose them every day; stupid little animals ...

kind regards,

Jos

[Tolls]

Think of them like disposable contact lenses.
See?
Nature's waay ahead of us on these things.

[JosAH]

Think of them like disposable contact lenses.
See?
Nature's waay ahead of us on these things.

Obviously there are no feriocious spider eaters active during the night; lazy bums, those spider eaters ... nature is kind of stupid ...

kind regards,

Jos