how to plot x axis with ratio unit instead of proportional unit

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Steven Lai
Steven Lai 2021-7-15
回答： Star Strider 2021-7-15
I'm doing some research about electrodes, and I want to show the relationship between electrode contact impedance and measured voltage, with contact impedance as x axis and measured voltage as y axis.
My problem is the data of contact impedance is in ratio and not propotional, and when plotting it can only shows a spicific region and not all of the contact impedance data.
My contact impedance data points are 1000, 1, 10^-3, 10^-6, 10^-9, and when i plot it only shows region between 1 and 1000 so the measured voltage below impedance=1 are all squeezed to the left. Is there any way that i can expand the left side of the x axis and make it look like a propotional x axis so the measured V can be clearly seen, and their corrisponding impedance?

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采纳的回答

Star Strider
Star Strider 2021-7-15
Ran in:
I am not certain that I understand the problem. However when you mention ‘squeezed to the left’, that could be correctged by using a semilogx (or loglog) plot.
Consider —
x = [1E-9 1E-6 1E-3 1 1E+3];
y = x.^2;
figure
subplot(3,1,1)
plot(x, y, 'p-', 'LineWidth',2)
grid
title('linear')
subplot(3,1,2)
semilogx(x, y, 'p-', 'LineWidth',2)
grid
title('semilogx')
subplot(3,1,3)
loglog(x, y, 'p-', 'LineWidth',2)
grid
title('loglog')
.

更多回答（1 个）

KSSV
KSSV 2021-7-15
You can plot log of the value. Read about semilog.

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