MATLAB: How to plot loglog(x,y) with an xlim and ylim

loglognegative data ignored

I am trying to graph using loglog(x,y), however I am running into problems with a Negative data ignored message. Here is some of my code:

xlim([1,1000000])

ylim([0.000000000001,0.00001]);

a= [2300*10^(-9), 223.0*10^(-9), 5.30*10^(-12), 20.0*10^(-12), 2.19*10^(-12)];

b=[8.7, 135, 3289, 51290,10219];

y= a(1).*exp(-x./b(1));

loglog(x,y,'b');

Thanks!

Best Answer

Christopher, move the xlim and ylim commands after the loglog command. Make sure that x > 0.

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MATLAB: How to set axis with different interval

One option is to change the scale of the x-axis:

%      x    y
M = [ 3     10
      5     11
      7     09
     10     12
     20     11
     30     10
     40     09
     90     12];
figure
plot(M(:,1), M(:,2), '-p')
Ax = gca;
Ax.XTick = M(:,1);
Ax.XScale = 'log';
axis([2  100    8  13])
xlabel('x')
ylabel('y')

producing:

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

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MATLAB: How to set axis with different interval

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