scatter3 in log-log-log

Hi,

I was wondering it was possible to generate a scatter3 plot but with one, or two or the three axis in log?

Thanks

n.

Answer 1

[Oleg Komarov]

After calling scatter3 use this line of code:

 set(gca,'Xscale','log','Zscale','log','Yscale','log')

[MatteP]

When I try to do it I get this error

Error using matlab.graphics.axis.Axes/set
Error setting property 'XAxis' of class 'Axes':
Value must be 'matlab.graphics.Graphics'.

Any suggestions?

[Walter Roberson]

Which MATLAB version are you using? And are you doing this in App Designer possibly?

[MatteP]

9.2.0.556344 (R2017a)

[Walter Roberson]

MatteP, would you be able to post a few lines that reproduce the error? I just tried in R2017a but was not able to get that message (though I think I might have just encountered a different bug.)

(Confirmed that I encountered a different bug, but that bug involves too many points being drawn in some circumstances, and no error message -- not likely to have any relationship to what you are encountering.)

Answer 2

[Chen]

hello

Can someone tell me the 'log' in

set(gca,'Xscale','log','Zscale','log','Yscale','log')

is in 'natural log'n or in log10?

I want to change to log10, after I generate a scatter3 linear figure.

How to do it?

Many thanks

Chen

[Walter Roberson]

It does not matter whether it is natural log or log10 or log2 or log98.7 -- any log scale will be a linear multiple of natural logs . So log10 would be 2.30258509299405 units per increase of 1 exponent, compared to natural log. But the linear scale of a plot is determined by the data units spanned, so data that was in some sense 2.30258509299405 times "more compact" would get magnified by a linear factor of 2.30258509299405 because there is a fixed vertical or horizontal space to hold all of the data units. The result is that no matter what base the log is, the linear scale turns out the same.

Where it would make a difference would be if you were placing a tick at each increase by 1 in the log -- are you placing ticks at exp(0), exp(1), exp(2), and so on, or are you placing ticks at 10^0, 10^1, 10^2, and so on. And that is a different question than the question of whether internally it is natural log or log10 . The answer is that no matter what internal base is being used for log scale, that the automatic tick choices are based around "nice" numbers in log10 .

So if you are relying upon the automatic tick choices, you would not be able to tell the difference between it being natural log or log10 internally.