On a semilogy plot, how to plot a line connecting two given points A&B and perform linear interpolation

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Matlab_Student
Matlab_Student 2017-10-10
回答： Walter Roberson 2017-10-10
As the question says, I would like to connect two points on a semilogy plot and perform linear interpolation. For example, given two points A(0,1) and B(10,1), draw out the straight line and find y value for x=5.

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Walter Roberson
Walter Roberson 2017-10-10
Lx = [A(1),B(1)]; Ly = [A(2), B(2)];
hold on
plot(Lx, Ly, 'c-'); %the connecting line
probe_x = 5;
probed_y = interp1(Lx, Ly, probe_x);
plot(probe_x, probe_y, 'r*');
hold off
This will draw a straight line on the semilogy plot. Which, when you think about it, is likely to be the wrong thing to do, because straight lines in log plots imply constant exponential growth.

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