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

Question

Matlab_Student 2017-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/360508-on-a-semilogy-plot-how-to-plot-a-line-connecting-two-given-points-a-b-and-perform-linear-interpolat

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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Answer 1

Walter Roberson 2017-10-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/360508-on-a-semilogy-plot-how-to-plot-a-line-connecting-two-given-points-a-b-and-perform-linear-interpolat#answer_285009

在 MATLAB Online 中打开

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.