Creating a second X-axis

Question

0 个投票

I would like to produce a second x-axis on a plot and I am having difficulty doing it. From the net resources I have have found the following code.

x1 = [0:.1:40]; 
y1 = 4.*cos(x1)./(x1+2); 
x2 = [1:.2:20]; 
y2 = x2.^2./x2.^3; 
hl1 = line(x1,y1,'Color','c'); 
ax1 = gca; 
set(ax1,'XColor','b','YColor','r') 
ax2 = axes('Position',get(ax1,'Position'),... 
'XAxisLocation','top',... 
'YAxisLocation','right',... 
'Color','none',... 
'XColor','k','YColor','k'); 
hl2 = line(x2,y2,'Color','k','Parent',ax2);

However I am unable to rewrite it to function for the plot I am using. There appears to be a relationship between the elements 'gca', 'get' , 'ax1' und 'ax2' that I do not understand. Also, all the web sites that I have found on the net so far seem to be written with the assumption that the relationship between These elements is understood.

4 个评论
显示 2更早的评论隐藏 2更早的评论

Michael 2013-6-23

Hi dpb, I read These documents have only have basic understanding of These functions.

I only Need another x-axis on the top...not another Y axis on the right. When I try to cut out the 'YAxislocation', 'right' object and location elements, the Y Axis gets double printed on the left.

Consider the following code: x1= 1:20; x2=linspace(1,5,10) y=cos(x1);

hl1 = line(x1,y,'Color','r'); ax1 = gca;

That will print a cosine graph using the x1 values.

Now what I Need to do is to get Matlab to print another scale on the top of the graph: x2= linspace (1,5,10)

I do not want another line in the graph. Just a scale that I can define on the top of the graph. I have tried various combinations of the "x2" in the example but have not been successful.

dpb 2013-6-24

在 MATLAB Online 中打开

Well, the very next thing the example I gave you the link to above does after drawing a line is...

_ Next, create another axes at the same location as the first, placing the x-axis on top and the y-axis on the right. Set the axes Color to none to allow the first axes to be visible and color code the x- and y-axis to match the data.

ax2 = axes('Position',get(ax1,'Position'),...
           'XAxisLocation','top',...
           'YAxisLocation','right',...
           'Color','none',...
           'XColor','k','YColor','k');

That does precisely what you asked for...you can have used plot() before or whatever to get the first axis.

Modify colors, xlimits, whatever as you wish after you have the axis handle.

请先登录，再进行评论。

请先登录，再回答此问题。

Follow Question

Answer 1

Walter Roberson 2013-6-23

0 个投票

You might want to use the FEX contribution "plotxx"

3 个评论
显示 1更早的评论隐藏 1更早的评论

Tom 2013-6-23

http://www.mathworks.co.uk/matlabcentral/fileexchange/317-plotxx-m

Michael 2013-6-24

编辑：Michael 2013-6-24

在 MATLAB Online 中打开

Hi Tom,

This is written on the origional post:

 plotxx.m
by Denis Gilbert 
 25 Jan 1999 (Updated 19 Feb 2002)

When I try "doc plotxx.m" in the command window I get the same result as for plotxx. Matlab tells me the document does not exist.

请先登录，再进行评论。

Creating a second X-axis

4 个评论
显示 2更早的评论隐藏 2更早的评论

回答（1 个）

3 个评论
显示 1更早的评论隐藏 1更早的评论

类别

标签

Community Treasure Hunt

Creating a second X-axis

4 个评论 显示 2更早的评论 隐藏 2更早的评论

回答（1 个）

3 个评论 显示 1更早的评论 隐藏 1更早的评论

类别

标签

另请参阅

Community Treasure Hunt

4 个评论
显示 2更早的评论隐藏 2更早的评论

3 个评论
显示 1更早的评论隐藏 1更早的评论