How to generate 1 cycle of a ppg signal repeatedly?

Question

Anupama V 2023-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/1912830-how-to-generate-1-cycle-of-a-ppg-signal-repeatedly

评论： Anupama V 2023-2-15

采纳的回答： Bhavana Ravirala

I want to repeat this signal periodically

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Answer 1

Bhavana Ravirala 2023-2-15

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Hi Anupma!

I understand that you want to repeat the signal that you have generated. You can use ‘repmat’ function for this operation.

n_cycles = 10; % Number of cycles to generate
%ppg_cycle is the signal which you want to repeat.
ppg_signal = repmat(ppg_cycle, 1, n_cycles);

Please refer to the below documentation for more information.

https://www.mathworks.com/help/matlab/ref/repmat.html

Hope this helps!!

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Anupama V 2023-2-15

Thankyou so much

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Answer 2

John D'Errico 2023-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/1912830-how-to-generate-1-cycle-of-a-ppg-signal-repeatedly#answer_1172080

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You have a function, that is defined on what seems to be roughly the interval [0,220]. Since you have not given us any data, only a picture of that data, I'll make something up to show an example.

x = 0:220;

y = exp(-((x-110)/50).^2)*12 - 6;

plot(x,y,'-')

Now you wish to perform the periodic extrapolation of this function onto the real line.

smallspl = makima(x,y);

xdomain = [min(x),max(x)];

extrapfun = @(X) fnval(smallspl,xdomain(1)+ mod(X-xdomain(1),diff(xdomain)));

fplot(extrapfun,[-1000,1000])

So the fully periodic extrapolation of this form onto the real line. I used fnval, which presumes the curve fitting toolbox, but you could have used ppval instead. And if makima does not work for you, you could have used pchip to create the spline. Or you could have used spline.