How to make plot, with different scales on one axis

Hi, I am trying to plot characteristic of photodiode. My problem is I can't find how to split the axis to two different scales in order to display the data appropriately.

You can see my script in the source.

My first data are here:

neosvicena_U = [-4 -2 -1 0 0.1 0.2 0.3 0.4 0.5 0.6];

neosvicena_I = [-11.4 -5.7 -3.4 -0.4 2.3 14.2 74.7 282.4 892 3513];

I have only managed to make x and y axis and also tick important values but dont know how to implement different scales.

Any help would be appreciated, thanks!

Answer 1

[Ameer Hamza]

Read my answer here: https://www.mathworks.com/matlabcentral/answers/601147-extending-specific-y-axis-values#answer_501697. It shows how to combine two axes to show different scales on the y-axis.

[Jan Mares]

Thanks for your answer but it worked only for some extend to me.. It seems that drawing it by hand would be my option... Plotting it in Matlab is optional and I wanted to do it from my own curiosity but it seems there is no easy solution :/

[Ameer Hamza]

I think you are limiting the y-axis to positive values. Maybe including negative values will help.

[Jan Mares]

If I include negative y values, I get warnig negative limits ignored :(

[Ameer Hamza]

Can you show your code?

[Jan Mares]

all my code is in the pinned png image, I have kinda managed some solution now.. it looks at least similar to what I wanted.

clear all

neosvicena_U = [-4 -2 -1 0 0.1 0.2 0.3 0.4 0.5 0.6];
neosvicena_I = [-11.4 -5.7 -3.4 -0.4 2.3 14.2 74.7 282.4 892 3513];
x = neosvicena_U ;
y = neosvicena_I ;

ax1 = axes('Position', [0.1 0.1 0.8 0.4]);
ax1.XLim = [-5 1];
ax1.YLim = [-12 70];
hold on;
plot(x, y);
ax = gca;
ax.XAxisLocation = 'origin';
ax.YAxisLocation = 'origin';
xlabel('U [V]')


ax2 = axes('Position', [0.1 0.5 0.8 0.4]);
ax2.XAxis.Visible = 'off';
ax2.YScale = 'log';
ax2.XLim = [-5  1];
ax2.YLim = [70 3500];
hold on;
plot(x, y);
ax = gca;
ax.XAxisLocation = 'origin';
ax.YAxisLocation = 'origin';
title('Neosvícená dioda')
xlabel('U [V]')
ylabel('I [microA]')