How to plot my sine waves in one graph, one right after another with 100ms in between and not on top of each other?

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Kristin Aldridge 2021-10-12

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https://ww2.mathworks.cn/matlabcentral/answers/1562151-how-to-plot-my-sine-waves-in-one-graph-one-right-after-another-with-100ms-in-between-and-not-on-top

评论： Kristin Aldridge 2021-10-12

I have a number of sine waves I need to plot one following the other, with 100 ms in between each, but I keep getting all of them ending up on top of one another. Also my x and y label wont appear on the graph for some reason I can't figure out why. Code below:

%plot of all

f=(0:5:150) %starting at (1,5,10,15...150)

f = [ ]

f(1) = 1

figure

for f=(0:5:150)

if f==0

f=1;

end

N = 10000*40*(1/f); %400,000

T=40/f

t= 0:(40*(1/f))/N:(40*(1/f));

plot(t,f*sin(2*pi*f*t),'r');

xlabel=({'Time','(in sec)'})

ylabel=({'Voltage','(in V)'})

title('Stimulus voltage over time')

t_100 = T/N:T/N:0.1;

Sine_100 = zeros(length(t_100),1);

hold on

end

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Kristin Aldridge 2021-10-12

It does work but my frequency is exponentially growing, which was easily solved by deleting the f part of f*sin out of plot(t,f*sin(2*pi*f*t),'r').

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Answer 1

Mathieu NOE 2021-10-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1562151-how-to-plot-my-sine-waves-in-one-graph-one-right-after-another-with-100ms-in-between-and-not-on-top#answer_807021

编辑：Mathieu NOE 2021-10-12

在 MATLAB Online 中打开

hello Kristin

I fixed your code

I prefered to use a constant fixed time increment for all frequencies instead of keeping the same number of samples as in your original code

the 100 ms of zero data between successives sine waves is also implemented , you can see it when zooming in the figure

hope it helps !

%plot of all 
f=(0:5:150); %starting at (1,5,10,15...150)
fs = 100*max(f); % fixed sampling rate
dt = 1/fs;
t_all = [];
out_all = [];
    
for f=(0:5:150)
    
    if f==0
        f=1;
    end
    T=40/f;
    t= 0:dt:T-dt;
    % individual vector
    out = f*sin(2*pi*f*t);
    
    % add 100 ms zero data
    samples = round(100e-3*fs);
    tzero = max(t) + (1:samples)*dt; 
    t = [t tzero];
    % padd out data with zeros
    out = [out zeros(1,samples)];
    
    % now concatenate all sine waves 
    if isempty(t_all)   % first iteration
        t_all = [t_all t];
    else                % next iterations
        t_all = [t_all t+max(t_all)];
    end
    out_all = [out_all out];
    
end
figure(1)
plot(t_all,out_all,'r');
xlabel=({'Time','(in sec)'}) 
ylabel=({'Voltage','(in V)'})
title('Stimulus voltage over time')