MATLAB: Semilog plot axis labels

axishomeworklabel;plotsemilogylim;ytick

I am trying to make a semilogy plot and it is giving me y-axis labels of 10^3, 10^4, 10^5….10^10 with tiny tics in between each. I want it to be 10^2, 10^4, 10^6…10^10 and without all the tiny ticks in between. I tried

ylim([10^2, 10^10]); 
set(gca, 'ytick', (10^2):(10^2):(10^10));

but when I run it matlab just says "busy" and then usually crashes. It doesn't do this when I don't try to change the labels it works fine. Any ideas what to do? Why is it crashing when I am just changing the labels?

Best Answer

set(gca, 'ytick', 10.^(2:2:10));

Your expression (10^2):(10^2):(10^10) means to start at 10^2 and to add 10^2 each time until 10^10 is reached. That would be a vector of (10^8 + 1) ticks.

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MATLAB: About axis ticks: how to set 10 ticks with 5 labels

x=1:10;
y = x;
plot(x, y)
ylim([0 10])
set(gca,'YTick', 1:1:10, 'YTickLabel', {'' '2' '' '4' '' '6' '' '8' '' '10'}  );

MATLAB: Problem with 2nd axis Yticks with plotyy and semilogy

Don't have your data to play with specifically, but a dummy set

>> y1=logspace(-1,-15,10).*rand(1,10);
>> y2=logspace(-2,-6,10).*rand(1,10);
>> hAx=plotyy(1:10,y1,1:10,y2,@semilogy,@semilogy);
>> ylim(hAx(1),[1e-15 1e-1])
>> set(hAx(1),'ytick',[1e-15, 1e-10 1e-5 1e-1])
>> ylim(hAx(2),[1e-6 1e-2])
>> set(hAx(2),'ytick',[1e-6, 1e-4 1e-2])
>>

has the expected result here. Of course, since there aren't the same number of ticks on the LH and RH axes you'll have the resulting "extra" tick on the RH axis corresponding to the location of the intermediaries on the left--this is a fignewton of the Matlab graphics that can't really be avoided.

Best Answer

Related Solutions

MATLAB: About axis ticks: how to set 10 ticks with 5 labels

MATLAB: Problem with 2nd axis Yticks with plotyy and semilogy

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