How to add multiple axes to a log-log plot?

I would like to create a log-log-plot with multiple x-axes. My goal is to display my data 'y' as function of 'x' and as a function of 'u=a*x' simultaneously. I have seen examples of plots with multiple axes but did not come across any log-log plot. Is there a way to achieve this?
Any hint would be appreciated, Christian

 采纳的回答

You have to set the xscale and yscale property of ax2 to 'log':
x1 = 1:1000;
y1 = x1.^2;
x2 = 2*x1;
y2 = y1;
loglog(x1,y1,'r')
hold on,
ax2=axes('xaxislocation','top','yaxislocation','right','color','none', 'xscale', 'log', 'yscale', 'log')
hold on
loglog(x2,y2,'g')

更多回答(2 个)

1 个评论

Thanks for pointing out this possibility. However, I'd like to have two different x-axis whereas a single y-axis is fine. 'plotyy' provides just the opposite.

请先登录,再进行评论。

Look at this example
x1=0:0.01:5
x2=10*x1
y1=sin(x1)
y2=2*cos(x2)
plot(x1,y1,'r')
hold on,
ax2=axes('xaxislocation','top','yaxislocation','right','color','none')
hold on
plot(x2,y2,'g')

1 个评论

Thanks for your suggestion which works fine for plots with a linear scale. As I want to create a log-log plot, I tried replacing the 'plot' commands by 'loglog' commands. Unfortunately, doing this, produces strange results.
For example:
x1 = 1:1000;
y1 = x1.^2;
x2 = 2*x1;
y2 = y1;
loglog(x1,y1,'r')
hold on,
ax2=axes('xaxislocation','top','yaxislocation','right','color','none')
hold on
loglog(x2,y2,'g')
This piece of code should produce two straight lines with the same slope. Instead, it creates a straight line and a parabola as the second set of axes has a linear scale.
Any idea how to overcome this problem?

请先登录,再进行评论。

类别

帮助中心File Exchange 中查找有关 Annotations 的更多信息

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by