Display negative values on logarithmic graph

bent

2012 3 8

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Hi, I want to plot a set of data where the values oscillates around 0 but the amplitude decays exponentially. It is normally plotted with two different logarithmic yaxis on top of each other. With the lower one in reverse order. Can that be done in Matlab?

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Grzegorz Knor 2012-3-8

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Plot the logarithm of the absolute value of y multiplied by sign of y, and the change labels:

x = linspace(0,3,10000);
y = 1e6*exp(-x).*(sin(10*x)-0.5);
plot(x,y)
figure
Y = sign(y).*log10(abs(y));
plot(x,Y,'.')
yl = get(gca,'ytick');
set(gca,'yticklabel',sign(yl).*10.^abs(yl))