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

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Ron Nativ
Ron Nativ 2020-9-22
评论： Ameer Hamza 2020-9-22
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

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Ameer Hamza
Ameer Hamza 2020-9-22
编辑：Ameer Hamza 2020-9-22
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')
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Ron Nativ
Ron Nativ 2020-9-22
编辑：Ron Nativ 2020-9-22
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
Ameer Hamza 2020-9-22
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';

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