how to plot sine wave without built in function ?
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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
3 个评论
Adam
2015-12-7
Obviously you could estimate one, but why would you want to?
Guillaume
2015-12-7
Probably not the answer you want, but conforms exactly to your request:
sine = @(x) cos(pi/2 - x);
Shaheer Ali
2015-12-8
采纳的回答
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
2015-12-8
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
更多回答（1 个）
Thomas Alex
2020-1-12
0 个投票
similarly how to plot 2 different sine waves with a phse difference?
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