Log-log plot which doen't display every values

Question

Flo 2016-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/293386-log-log-plot-which-doen-t-display-every-values

评论： the cyclist 2016-7-4

Hi everyone,

I believe some data I am playing with could be better displayed using a loglog plot. my vector:

So, if I correctly plot that I should end-up with five marks on my graph right ? which is confirmed by the bar graph I get through my code:

So far my code only display three points... and I obviously need to display them all. Would you help me on that? Is it because the loglog function can't allow you don't display values equal to zero ?

my code:

none = length(one)
ntwo = length(two)
h(1:none,1)=one
h(1:ntwo,2)=two
[y,x]=hist(h)
stringTitle1 = 'test'
stringTitle2= ' comparison'
bar(x,y, 'group')
title('test title')
xlabel('test name') % x-axis label
ylabel('Frequency') % y-axis label
legend('XZ','YZ')
xLog = y(:,1)
yLog = y(:,2)
loglog(xLog,yLog,'.')

Cheers, Flo

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Answer 1

the cyclist 2016-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/293386-log-log-plot-which-doen-t-display-every-values#answer_227402

编辑：the cyclist 2016-7-1

The basic problem is that log(0) is "equal" to negative infinity, so cannot be displayed.

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Flo 2016-7-4

编辑：Flo 2016-7-4

Alright, I see. it makes more sense. Would you suggest a way of better displaying a result like that :

Thank you for your help.

Flo

the cyclist 2016-7-4

A simple option is to use a log(x+1) rather than a log(x) transformation to display the data. In other words, just add 1 to your data before using loglog. There are pros and cons to this approach. Here is one place you could read a bit about the practical aspects.

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