Generating sinusoidal wave in MATLAB but I get STRAIGHT line instead??

Question

Susan 2011-6-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/10310-generating-sinusoidal-wave-in-matlab-but-i-get-straight-line-instead

I am trying to learn about the signals and wave for awhile now, It worked at the beggining but when I added few lines I get now curved line, I know it meant to be easy but not sure whats wrong .. I am using possion distribution !

here is my code..

    function S = trial(lambdaMax,lambda,T)
t = 0;
I = 0;
S = [];
 u = rand;
t = t - log(u)/lambdaMax;
 while t < T
     u = rand;
    if (u <= lambda(t)/lambdaMax)
        I = I+1;
        S(I) = t;
    end
    u = rand;
    t = t - log(u)/lambdaMax;
end

this is the script to run it,,

lambdaMax=50;
T=1;
lambda =@(x) lambdaMax * sin(x); 
S = trial(lambdaMax,lambda,T);
figure
hold on
plot(S,lambda(S),'*')
xlabel('t')
ylabel ('sin(x)')

4 个评论
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Jan 2011-6-26

Well, as far as I remember the sinus *is* a curved line.

Naturally the computations are correct in the sense that Matlab interpretes the shown code correctly. So if you expect a different result, most likely your expectations are wrong.

Please take the time to formulate a question and explain the difference between "curved line" and "sin wave" with any details.

Susan 2011-6-26

I mean just a straight line but just in different angle perhaps I should not use curved.. its actually straight line and the expected the usual sin curved waves

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Answer 1

Jan 2011-6-26

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/10310-generating-sinusoidal-wave-in-matlab-but-i-get-straight-line-instead#answer_14189

If you call your function "trial" with T=2*pi you get a full period of a sinusidal curve. With T=1 you get just the first part, which looks almost straight, but it has a small curvature.