Creating a second X-axis
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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 Comments
dpb
on 24 Jun 2013
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.
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