How to make the following shape in Matlab

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Med Future
Med Future 2022-5-31
编辑： Sam Chak 2022-5-31
Hello, I hope you are doing well. i Have attached the two files, i want to create the similar plot using Matlab
How can i do that?
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Walter Roberson
Walter Roberson 2022-5-31
Each of the pulses is slightly non-symmetric, some more obviously than others. Some are nearly the reverse of others.
The non-symmetry might possibly indicate that the pulse is symmetric but not sampled exactly symmetrical around the axis of symmetry.
Walter Roberson
Walter Roberson 2022-5-31
编辑：Walter Roberson 2022-5-31
The second pulse is roughly
p = [-1024/5, 7168/5, -12544/5]
x = linspace(3+3/16,3+13/16,32);
y = polyval(p, x);
plot(x, y)
daspect([1/2,5])

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回答（1 个）

Sam Chak
Sam Chak 2022-5-31
编辑：Sam Chak 2022-5-31
Hi @Med Future
Edit: Make good use from @Walter Roberson's polynomial regression model of the second pulse from the OP's second image.
First Figure
s = [0 4 8]
p = [-1024/5, 7168/5, -12544/5];
for j = 1:length(s)
x(j, :) = linspace(s(j)+3/16, s(j)+13/16, 32);
y(j, :) = polyval(p, x(j, :)-(s(j)-3));
plot(x(j, :), y(j, :), 'linewidth', 1.5)
hold on
end
hold off
grid on
xlabel('s')
ylabel('PA')
Second Figure:
s = [0 3 4 7]
p = [-1024/5, 7168/5, -12544/5];
for j = 1:length(s)
x(j, :) = linspace(s(j)+3/16, s(j)+13/16, 32);
y(j, :) = polyval(p, x(j, :)-(s(j)-3));
plot(x(j, :), y(j, :), 'linewidth', 1.5)
hold on
end
hold off
grid on
xlabel('s')
ylabel('PA')
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Sam Chak
Sam Chak 2022-5-31
编辑：Sam Chak 2022-5-31
@Med Future
Edit: Guessing the correct math functions without any useful info or unique features is like searching a needle in a haystack. Since you are unable to provide the data points, I guess this indefinite problem is beyond my capability. Good luck!

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