Plotting 1MHz sine wave

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Maty Blanc
Maty Blanc 2016-1-25
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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采纳的回答

jgg
jgg 2016-1-25
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.

更多回答（1 个）

Chad Greene
Chad Greene 2016-1-25
I see the problem. 1/N is 1/64 and you're trying to populate a vector in steps of 1/N from 0 to 3e-6 when you do
t = 0:1/N:S;
Do you want 64 steps from 0 to S? If so use
t = linspace(0,S,64);

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