Plotting 1MHz sine wave

Question

Maty Blanc 2016-1-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/265155-plotting-1mhz-sine-wave

评论： Maty Blanc 2016-1-25

Hi, so the title summarizes what I am trying to do. My MATLAB knowledge is minimal, I only know some C++ which at this point is saving me. I am trying to play around with the 't' variable but I keep getting the value extremely small to the point MATLAB thinks it's is value 0. The sample size is what it is confusing me. Can anyone help me code this please? I am just trying to get a pretty plot, that's all. Thank you.

clear all;
figure(1);
N = 64;
apl = 2;
freq = 1e6;
shift = pi/3;
T = 1/freq;
S = 3*T;
t = 0:1/N:S;
x = apl * sin(2*pi*freq*t + shift);
plot(t,x);

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Answer 1

jgg 2016-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/265155-plotting-1mhz-sine-wave#answer_207389

在 MATLAB Online 中打开

Just change this line:

t = 0:1/N:S;

to this

t = 0:(1/N)*S:S;

The issue was that you are telling Matlab to create t as a vector of values from 0 to 3/1e6 in steps of 1/64. You want to to take 64 steps, not steps of SIZE 1/64. This correction should fix it.