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Basic Matlab Help...Please

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Stephen
Stephen el 28 de Feb. de 2012
I have 50 wave heights (H) and 50 corresponding wave frequencies (w) and I need to create 50 sine waves over a 30 minute period and then add them up.
I have tried:
S = H.*sin(w.*t) which does not work
and:
S_1 = H(1)*sin(w(1).*t)
which takes too long because I would have to do that 50 times and then later would have to do it 306 times.
I need a quicker way to do it that does element by element multiplication to create 50 sine waves and then add the sin waves up element by element.
Thank you

Respuestas (3)

Stephen
Stephen el 28 de Feb. de 2012
I want to add each point of time together from the two sine waves...
i.e
Amplitude from wave 1 at time 1 sec + Amplitude from wave 2 at time 1 sec
but I need it for 30 mins and 50 waves.

Tom
Tom el 28 de Feb. de 2012
I think that you have to have a for loop. What about
for t=1:1800
S(t) = sum(H.*sin(w*t))
end
This should give you an array S that is the sum of all the waves at each second, so that (for example) S(61) will be the sum of the waves at 1 minute and 1 second and so on.... You should then be able to graph S as a function of time.
plot(S)
  1 comentario
Walter Roberson
Walter Roberson el 28 de Feb. de 2012
A for loop makes things easier and clearer, but see my new answer for a method without a for loop.

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Walter Roberson
Walter Roberson el 28 de Feb. de 2012
Let H, w, and t all be row vectors, and H and w must have the same number of elements but t can be different. Then you want
S = sum(bsxfun(@times,H(:),sin(bsxfun(@times,w(:),t))));
  4 comentarios
Walter Roberson
Walter Roberson el 29 de Feb. de 2012
Hmmm, I did test before I posted. Are you sure your t is a *row* vector?
Stephen
Stephen el 29 de Feb. de 2012
Ignore my ignorance...I found my mistake it works great. Thank

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