How do I create a Gaussian pulse for the given expression?

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Addy
Addy 2018-6-4
评论： Tosin Babarinde 2019-8-7
I have an expression. If I use the expression in a FEA software(COMSOL Multiphysics), It gives me a plot. But in matlab, How can I generate a plot like that? I have the expression but I have no idea to plot a signal like this. I have no experience other than plotting basic sin and cosine waves. Can anyone help me out? The expression is
A*(1-cos(2*pi*f*t/N))*sin(2*pi*f*t)*(t<(N/f))
the other values are f=250*10^6; A=35; N=5;
so it is a 5 cycle Gaussian pulse.. I have attached the picture of the plot I generated in COMSOL.
  1 个评论
Tosin Babarinde
Tosin Babarinde 2019-8-7
hi Addy,
good to know you asked this question here. I just got to start using MATLAB and COMSOL for some simulation. But I can not get to define as excitation signal in COMSOL which I think is what you were trying to do by defining this gauss signal in MATLAB.
do you mind giving some insight on how you did this?
I understand it's past a year already. but hoping you get this comment and have the chance to reply to me!
cheers,
Tosin

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Rik
Rik 2018-6-4
Something like this?
f=250*10^6; A=35; N=5;
t=linspace(0,2*N/f,500);
V=A*(1-cos(2*pi*f*t/N)).*sin(2*pi*f*t).*(t<(N/f));
figure(1),clf(1)
plot(t,V)
  2 个评论
Addy
Addy 2018-6-5
Yes. Thank you Rik. It worked. Can I know why point multiplication plays an Important role here? Because when I was trying, I did not use that and I came no where near the solution. I was always getting 0 for V in the equation..
Rik
Rik 2018-6-5
The point signifies that a multiplication should be element-wise (same goes for division). If you don't, you're going to have a matrix multiplication, which changes the size. If you're not sure where to use a dot, you can always err on the safe side: any superfluous dots will be ignored.

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