At every value of x, how measure slope of plot?

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MOHD UWAIS
MOHD UWAIS 2023-2-27
编辑： Torsten 2023-2-27
clear all
clc
x=[15 20 25 30 35 40 45 50 55];
y=[11.89 11.845 11.85 11.855 11.865 11.93 12.01 12.2 12.77];
plot(x,y)

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回答（1 个）

Torsten
Torsten 2023-2-27
编辑：Torsten 2023-2-27
Ran in:
Look at the approximate slope curve under
https://de.mathworks.com/matlabcentral/answers/1919960-how-can-i-interpolate-x-and-y-data-points-in-plot-and-slope-dy-dx-at-any-value-of-x?s_tid=srchtitle
You cannot expect a simple explicit equation for it.
A possible function is given here as dy:
X=[15 20 25 30 35 40 45 50 55];
Y=[11.89 11.845 11.85 11.855 11.865 11.93 12.01 12.2 12.77];
dY = gradient(Y,5);
dy = @(x) interp1(X,dY,x)
dy = function_handle with value:
@(x)interp1(X,dY,x)
dy(22.8)
ans = -0.0012

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