how to plot sine wave without built in function ?

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Shaheer Ali
Shaheer Ali 2015-12-7
回答： Thomas Alex 2020-1-12
Hi.. um i wanted to ask a small question .. um a beginner in Matlab so .. i wanted to know if there's a way to create a sine wave without the sine function .. ? waiting for your reply
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Guillaume
Guillaume 2015-12-7
Probably not the answer you want, but conforms exactly to your request:
sine = @(x) cos(pi/2 - x);
Shaheer Ali
Shaheer Ali 2015-12-8
thankyou but i want o plot it without the builtin sine cosine functions

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Star Strider
Star Strider 2015-12-7
I don’t know why you would want to, but this works with reasonably accuracy:
sine = @(x) sum((x.^[1:2:18]) .* -((-1).^[1:9]) ./ factorial([1:2:18]));
  2 个评论
Shaheer Ali
Shaheer Ali 2015-12-8
umm im still a beginner so can you please wxplain it a little and specify how to plot using this .. please .. thankyou !
Star Strider
Star Strider 2015-12-8
My pleasure!
To plot it, first define a range for the angle, then use the function on that range. I wrote it quickly, so it doesn’t take vector arguments and the loop is necessary:
sine = @(x) sum((x.^[1:2:18]) .* -((-1).^[1:9]) ./ factorial([1:2:18]));
angl = linspace(-2*pi, 2*pi, 500);
for k1 = 1:length(angl)
sineval(k1) = sine(angl(k1));
end
figure(1)
plot(angl, sineval)
grid

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Thomas Alex
Thomas Alex 2020-1-12
similarly how to plot 2 different sine waves with a phse difference?

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