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How can plot integral for sin wave

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face wasd
face wasd 2013-6-14
评论： sirisha tammineni 2021-2-23
HELLO
iam plot sin wave signal and used the code in m file:
t=0:0.1:360*22/7/180;
x1=sin(t);
plot(t,x1);
but how can plot integral for sin wave?
please help me
tech
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Wayne King
Wayne King 2013-6-14
Now, I'm confused. You say "how can plot integral for sin wave?" This has to be the indefinite integral. The definite integral is just a number, so do you want to plot something or do you just want a number. Did you see my response below? That finds and plots the indefinite integral.
face wasd
face wasd 2013-6-14
Iam plot integral for sin wave in simulink ,the form the signal positive and the amplitude from 0 to 2 ????

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回答（3 个）

dileep- adabala
dileep- adabala 2013-6-14
DO MATHEMATICAL CALCULATIONS FIRST TTHEN PLOT FOR COS WAVE
Wayne King
Wayne King 2013-6-14
编辑：Wayne King 2013-6-14
t=0:0.1:360*22/7/180;
x1=sin(t);
dt = t(2)-t(1);
x2 = cumsum(x1.*dt);
x2 = x2-1-x2(1);
plot(t,x2)
Or
x2 = cumtrapz(t,x1);
x2 = x2-1-x2(1);
plot(t,x2)
  2 个评论
face wasd
face wasd 2013-6-14
thanks for reply
Iam plot integral for sin wave in simulink ,the form the signal positive and the amplitude from 0 to 2 ????
sirisha tammineni
sirisha tammineni 2021-2-23
x2 = cumsum(x1.*dt);
x2 = x2-1-x2(1); sir can u explain these two lines

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Samarth
Samarth 2013-6-14
f=inline('sinx','x');
syms x;
y=int(f(x),x);
t=0:0.1:360*22/7/180
hold on
plot(y(t),t);
end

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