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Combine two MATLAB figures with two y axes

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SS on 14 May 2020
Commented: Ameer Hamza on 15 May 2020
Hi. I have two MATLAB figures and I want to combine them together, meaning to show them on one plot. These two figures have two y-axes. Unfortunately, the code I am using combines only the figures based on the right Y-axes. Can someone help me with this. I am attaching the fig files.
Dir = 'D:\Original_Plots\';
BinSuffix={''}; % Text_followed by number ID
% Load figures
for j = 1:1:length(BinSuffix)
h1(j) = openfig([Dir prefix1 BinSuffix{j} '.fig'],'reuse');
ax1(j) = gca;
for j = 1:1:length(BinSuffix)
h2(j) = openfig([Dir prefix2 BinSuffix{j} '.fig'],'reuse');
ax2(j) = gca;
% Combine figures
for j = 1:1:length(BinSuffix)
hf = figure(20);
hold on;
fig1 = get(ax1(j),'children');
fig2 = get(ax2(j),'children');
s = gca;
xlabel('x1,x2');hold on;
ylabel('y1'); % on left axis
hold on;
ylabel('y2'); % on right axis


Ameer Hamza
Ameer Hamza on 14 May 2020
Do you only have two files, or do you want to extend it to several files? Also, do you want to keep the current left and right locations of plots the same location in the new figure?
SS on 14 May 2020
HI, thanks for your reply. I have only two files. I want to keep the same locations of the axes positions. Also, how can I adjust the 'Ylim' for both the y-axes on the left and the right?

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Accepted Answer

Ameer Hamza
Ameer Hamza on 14 May 2020
Edited: Ameer Hamza on 14 May 2020
Try this code
fig1 = openfig('plot_1.fig');
fig2 = openfig('plot_2.fig');
ax1 = findobj(fig1, 'type', 'axes');
yyaxis(ax1, 'left');
line1L = ax1.Children;
yyaxis(ax1, 'right');
line1R = ax1.Children;
ax2 = findobj(fig2, 'type', 'axes');
yyaxis(ax2, 'left');
line2L = ax2.Children;
yyaxis(ax2, 'right');
line2R = ax2.Children;
fig = figure;
ax = axes();
LineL = copyobj([line1L line2L], ax);
yyaxis(ax, 'right');
LineR = copyobj([line1R line2R], ax);
To change the ylimits you can do something like this
yyaxis(ax, 'left');
ax.YLim = [0 2]; % change Ylimits of left axes
yyaxis(ax, 'right');
ax.YLim = [0 2]; % change Ylimits of right axes

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