Plot step function with y-axis in log-scale

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Rayne
Rayne 2016-4-9
评论： Rayne 2016-4-9
Hi,
How can I plot something like this?
I can only either use semilogy to plot the graph in log scale (without step function), or plot the step function (using "stairs" function) but with the y-axis in terms of the exponential (by taking the log of the y-values first).
How do I do both?
Thank you.
  2 个评论
Rayne
Rayne 2016-4-9
Basically, I'm trying to create the type of plot in the given picture, i.e. step function on a log-scale y-axis. I could only get either a smooth curve on a log scale, or a step function on a non-log-scale. How do I do both?

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Walter Roberson
Walter Roberson 2016-4-9
If you are trying to get one line to be in log y scale and another to be in linear y scale, then you should plotyy() and set one of the axes to 'yscale' 'log'
If you are having problems that somehow stairs() does not look right with semilogy, then I do not seem to reproduce that in R2014a.
But if you happen to need some code to reproduce stairs() in terms of plot(), then:
plot( [x(1),kron(x(2:end),[1 1])], [kron(y(1:end-1),[1 1]),y(end)] )
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Rayne
Rayne 2016-4-9
Thanks, I managed to plot it using something like
stairs(1:10, 2*(1:10));
set(gca, 'YScale', 'log')

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