How to make the following shape in Matlab

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?

[Rik]

What is your input data and what have you tried?

[Med Future]

@Rik my input data is the two picture i have attached. i want to create same plots.

[Med Future]

@Rik i have updated the question now you can see the plots

[Rik]

Do you have the actual underlying data you want to plot? Because if you want the images, you already have them.

[Dyuman Joshi]

Do you have any data or do you want to create a plot from scratch?

[Med Future]

@Rik @Dyuman Joshi No i have not any actual data , i have only the images , i want to create it from scratch

[Sam Chak]

@Med Future

Then your lecturer/supervisor must be "torturing'' you...

It is still possible to plot the first one using some mathematical functions with a repetitive pattern.

The second one is bit tricky. But the function should look something like , where the function is related to the first one.

[Walter Roberson]

f(abs(s-4)) maybe?

[Med Future]

@Sam Chak @Walter Roberson can you share any code solution for that? we can neglect x axis and y axis values

[Walter Roberson]

I do not have code for this.

Your second image involves three different pulses. The second and fourth are mirror images of each other. The first and the third are different: notice that the right leg of the third pulse descends further.

I am not prepared to mentally estimate the function, or to measure the pattern of changes in distance between points.

[Med Future]

@Walter Roberson When you have free please try it.

[KSSV]

@Med Future If you want to plot just these two images alone, then try this https://in.mathworks.com/matlabcentral/fileexchange/7173-grabit. This will let you extract the points from image and then you havde data in hand.

[Walter Roberson]

Sorry, this is not something I have an interest in doing.

[Walter Roberson]

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]

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])

Answer 1

[Sam Chak]

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')

[Dyuman Joshi]

I think a reverse parabola might suit better.

[Med Future]

@Sam Chak it is not the i want, the shape is different from the image i have attached

[Med Future]

@Dyuman Joshi How?

[Sam Chak]

@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!