Plotting figure with 2 x-Axes and a y axis

I have 3 arrays of length 903:

x1_ data, x2_data and y_data.

x1_data, x2_data are the bottom and top x axes that I want and

and y_data is the common y_axis I want for both x_axes.

I have attached array.mat files for the 3 variables and the output that I am getting.

Also below is the relevant snippet of the code I have used:

Also output of ver- output

CODE:

plot(x1_data,y_data,'.','MarkerSize',12);

ylim([-0.2 (1+(0.1*length(filename1)))])

hold on;

grid on;

xlabel('Energy (eV)','fontsize',15),ylabel('Counts','fontsize',15);

set(gca,'fontsize',14,'FontWeight','Bold');

ax1 = gca;

ax1_pos = ax1.Position; % position of first axes

ax2 = axes('Position',ax1_pos,...

'XAxisLocation','top',...

'YAxisLocation','right',...

'Ycolor','none',...

'Color','none');

hold on;

plot(x2_data,y_data,'Parent',ax2,'Color','none');

set(gca,'fontsize',14,'FontWeight','Bold');

hold on;

ver -support output:

>> ver -support

-----------------------------------------------------------------------------------------------------

MATLAB Version: 9.4.0.813654 (R2018a)

MATLAB License Number: 623588

Operating System: Microsoft Windows 10 Home Version 10.0 (Build 18362)

Java Version: Java 1.8.0_144-b01 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode

-----------------------------------------------------------------------------------------------------

MATLAB Version 9.4 (R2018a) License 623588

Simulink Version 9.1 (R2018a) License 623588

Bioinformatics Toolbox Version 4.10 (R2018a) License 623588

Control System Toolbox Version 10.4 (R2018a) License 623588

Curve Fitting Toolbox Version 3.5.7 (R2018a) License 623588

DSP System Toolbox Version 9.6 (R2018a) License 623588

Data Acquisition Toolbox Version 3.13 (R2018a) License 623588

Financial Toolbox Version 5.11 (R2018a) License 623588

Image Processing Toolbox Version 10.2 (R2018a) License 623588

Instrument Control Toolbox Version 3.13 (R2018a) License 623588

Optimization Toolbox Version 8.1 (R2018a) License 623588

Parallel Computing Toolbox Version 6.12 (R2018a) License 623588

Signal Processing Toolbox Version 8.0 (R2018a) License 623588

Simscape Version 4.4 (R2018a) License 623588

Simscape Multibody Version 5.2 (R2018a) License 623588

Simulink Control Design Version 5.1 (R2018a) License 623588

Stateflow Version 9.1 (R2018a) License 623588

Statistics and Machine Learning Toolbox Version 11.3 (R2018a) License 623588

Symbolic Math Toolbox Version 8.1 (R2018a) License 623588

>>

[KSSV]

plot(y_data,x1_data)
hold on
plot(y_data,x2_data)
legend('x1','x2')

This would suffice right?

[Salil Kale]

@KSSV

No this isn't what I want. Its 2 x-Axis I want on the same figure. NOT two curves on the same figure.

Answer 1

[Subhadeep Koley]

Since the code you provided already creates two X axes one in top and one in bottom therefore, I assume you want both the X axes in the bottom of the figure.

The following code might help you.

load y_data;
load x1_data;
load x2_data;
hAX=axes;% first axes, save handle
plot(x1_data,y_data,'.','MarkerSize',12);
hold on;
grid on;
xlabel('Energy (eV)','fontsize',15),ylabel('Counts','fontsize',15);
set(gca,'fontsize',14,'FontWeight','Bold');
pos=get(hAX,'position');% get the position vector
pos1=pos(2); % save the original bottom position
pos(2)=pos(2)+pos1; pos(4)=pos(4)-pos1;% raise bottom/reduce height->same overall %upper position
set(hAX,'position',pos)% and resize first axes
pos(2)=0.2; pos(4)=0.00;% reset bottom to original and small height
hAX(2)=axes('position',pos,'color','none');% and create the second
plot(x2_data,y_data,'Parent',hAX(2),'Color','none');
set(gca,'fontsize',14,'FontWeight','Bold');

[Salil Kale]

Hi Subhadeep,

No this isn't what I want.

The attached figure shows the kind of plot that I want:

The only difference is that in my plot the energy wavelength axis positions will be interchanged. That is the Energy axis should be in the bottom and the numbers should be accending and the Wavelength axis should be at the top of the plot in a descending manner.

[Subhadeep Koley]

Okay I understand. Try the code below.

clc;close all;
load y_data;load x1_data;load x2_data;
plot(x1_data,y_data,'.','MarkerSize',12);
ylim([-0.2 (1+(0.1*length(filename1)))])
hold on;grid on;
xlabel('Energy (eV)','fontsize',12),ylabel('Counts','fontsize',12);
set(gca,'fontsize',12,'FontWeight','Bold');
ax1 = gca;
ax1_pos = ax1.Position; % position of first axes
ax2 = axes('Position',ax1_pos,...
    'XAxisLocation','top',...
    'YAxisLocation','right',...
    'Ycolor','none',...
    'Color','none');
hold on;
plot(flip(x2_data),y_data,'Parent',ax2,'Color','none');
set(gca,'xdir','reverse'); % This line changes the Wavelength axis to decending
set(gca,'fontsize',12,'FontWeight','Bold');

[Dzul Idham]

how set title on above graph

Answer 2

[Harsimran Singh]

hello Subhadeep, I am using your code which you metioned above. It works well. But I am facing a problem.

I have data in 3 columns,

Column #1= Date(YYYY-MM-DD)

Column #2= Time(hr)

Column #3= Temp

I want to plot a graph with Temp on y-axis and need to have two x-axis. One x-axis should have Time(HR) and other x-axis should have Date(YYYY-MM-DD).

At the end I want time(HR) should match with date. Means when date is 2021-05-18 on one x-axis, time on the another x-axis should be 1000.44, as per data

I am using Matlab R2021b

Any suggestion, how I could solve this?

Thanks in advance!

Answer 3

[Adila Nalisa Binti Mohd Roslan]

Hi Subhadeep, I am using your code that you provided. It works well. However I am notice that for the second axis is not link with the curves for 1st axis. How can I link 2 axis so that the curve that have been plotted follow for both x-axis.

Thanks in advance!