Creating a spline (curve) parallel to an existing spline (curve)

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Kanchan
Kanchan 2022-8-29
编辑： Torsten 2022-8-29
Hi,
I have attached an I_chart. This is a discrete dataset.
If I have a different starting values (intial values) for d and i, how do I create a new plot (line or curve) parallel to the existing dataset.
I tried curve fitting, it didn't work if the fit is not good for the existing dataset.
In short, I want to create mutiple splines (from different initial values) parallel to the existing spline, and read their values.
Thanks for your help.
Cheers!
KD

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回答（1 个）

Image Analyst
Image Analyst 2022-8-29
Ran in:
What exactly does "parallel" mean to you? Do you just want to shift it up or down by some amount, like this?
data = readmatrix('I_chart.xlsx');
x = data(:, 1);
y = data(:, 2);
plot(x, y, 'b.-')
grid on;
y2 = y + 0.1;
hold on;
plot(x, y2, 'r.-')
legend('Original', 'Shifted')
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Torsten
Torsten 2022-8-29
编辑：Torsten 2022-8-29
s1(x) = s0(x-(d1-d0)) + I1-I0
(d0,I0) = (0.1, 0.9185)
(d1,I1) = (0.2, 1.2)
Kanchan
Kanchan 2022-8-29
编辑：Kanchan 2022-8-29
An update:
I think I did it; a very crude way
by calculating slope and delta-x at each x. I am calculating delta-x also because the increment is not uniform.
Then, use slope values, delta-x values, new x0, and y0 calculate a new set of x and y.
The graph looks like this (I used log-log plot). The original plot is the thick black line.

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