How to add a second , upper x axis and control the value's locations and text?

Hi all,

My code generates simple plot and I would like to add a second x-axis with the same scaling as in the first one. However, I cannot seem to control the locations and text where values are placed, from some reason. I would be happy to get your help.

Here is my code:

x = 1:10

y = x.^2;

%

plot(x,y)

xlabel('vector 1')

ylabel('vector 2')

ax1 = gca;

% handle second X-axis

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

k=get(ax1,'XTick');

l=get(ax1,'Position');

set(ax2,'YTick',([]));

Thanks!

Ron

Answer 1

[Ameer Hamza]

Are you trying to do something like this

x = 1:10;
y = x.^2;
%
ax1 = axes();
box(ax1);
xlabel('vector 1')
ylabel('vector 2')
plot(x,y)
% handle second X-axis
ax2 = axes('Position', get(ax1,'Position'), ...
    'XAxisLocation','top', ...
    'Color','none', ...
    'XColor','k');

ax2.YAxis.Visible = 'off';
ax2.XLim = ax1.XLim;

also add the following line if you want the x-limits to be automatically linked

linkprop([ax1 ax2], 'XLim')

[Ron Nativ]

Hi Ameer,

thank you for your answer. This is indeed what I would like to doo, however can the numbers on the second x axis be edited? for example, change the 1 to 10^0, and delete some of the numbers.

[Ron Nativ]

anyone? can't seem to find any available answer on this forum....

[Ron Nativ]

I found a solution, if anyone is intersted:

%%

axes2 = axes('Parent',figure_name,...

'Position',[0.14 0.15 0.77 0.78]);

xlim(axes2,[xlim1 xlim2]);

% Set the remaining axes properties

set(axes2,'Color','none','XAxisLocation','top','XColor',[0 0 0],...

'XMinorTick','on','XScale','log','XTick',[1 1000 1e6],...

'XTickLabel',{'1 year','1000 years','10^{6} years'});

set(axes2,'YTickLabel',[],'Ytick',[],'Ycolor',[1 1 1])

%%

[Ameer Hamza]

I thought that you wanted the same x limits. I am glad that you found the solution. The following code shows an alternate way.

x = 1:10;
y = x.^2;
%
ax1 = axes();
box(ax1);
xlabel('vector 1')
ylabel('vector 2')
plot(x,y)

% handle second X-axis
ax2 = axes('Position', get(ax1,'Position'), ...
    'XAxisLocation','top', ...
    'Color','none', ...
    'XColor','k');
ax2.YAxis.Visible = 'off';
ax2.XLim = [1 1e6];
ax2.XTick = [1 1e3 1e6];
ax2.XTickLabel = {'1 year','1000 years','10^{6} years'};
ax2.XScale = 'log';