double x-axis on loglog scale

Question

Samaneh Arzpeima 2019-2-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/445943-double-x-axis-on-loglog-scale

回答： Etsuo Maeda 2019-2-28

test.xls

Hello

I have read my data from an excel file(attached here) and ploted them on a loglog scale,now I want to show another xaxis on the top of my figure (except my current x axis at the bottom) with just different scale . I tried the code inside the %%---%% but it did not work.The code outside of this part goes well.

could you please give me some idea how to add a second x axis to my figure.

I appreciate your time in responding to whatever you can.

thank you

clear all
clc
numdata = xlsread('test.xls');
Mw  = numdata(:,1);
Area = numdata(:,2);
moment=10.^( 1.5.*Mw + 9.1 )
figure(1)
loglog(moment,Area,'ko',...
    'MarkerEdgeColor','w',...
    'MarkerFaceColor','k',...
    'MarkerSize',6)
%% ---------
% part to add x axis on top
ax1 = gca;  % current axes
ax1_pos = ax1.Position;  % position of first axes
ax2 = axes('Position', ax1_pos,'Color', 'none')
set(ax2, 'XAxisLocation', 'top')
% % set the same Limits and Ticks on ax2 as on ax1;
set(ax2, 'XLim', get(ax1, 'XLim'))
set(ax2, 'XTick', get(ax1, 'XTick'))
nticks = 6;
tickpos=[7 7.5 8 8.5 9 9.5]
set(gca, 'XTick', tickpos)
 set(ax2,'Ytick',[]);
%%----------
c=1.77e-10;
M0=moment;
yCalc2=(c.*moment.^(2/3))
hold on
loglog(moment,yCalc2,'c-','LineWidth',1)
sim_moment  = numdata((1:9),3);
sim_Area = numdata((1:9),4);
loglog(sim_moment,sim_Area,'mh',...
    'MarkerEdgeColor','w',...
    'MarkerFaceColor','m',...
    'MarkerSize',9)
xlabel('Moment (Nm)')
ylabel('Rupture Area (km^{2}) ')
saveas(gcf,'test.png')

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Answer 1

Etsuo Maeda 2019-2-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/445943-double-x-axis-on-loglog-scale#answer_362549

This code may help you.

X = rand(5);
loglog(X)
ax1 = gca;
ax1.Box = 'off';
hold on;
% create new axes with nothing but xaxis on top
ax2 = axes;
ax2.Color = 'none';
ax2.XAxisLocation = 'top';
ax2.YTick = [];