Combine two MATLAB figures with two y axes

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\';
prefix1='plot_1';
prefix2='plot_2';

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;
    h1(j)
end

for j = 1:1:length(BinSuffix)
    h2(j) = openfig([Dir prefix2 BinSuffix{j} '.fig'],'reuse');
    ax2(j) = gca;
end


% 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;
    copyobj(fig1,s);
    copyobj(fig2,s);
    
end

% AXES LABELS
xlabel('x1,x2');hold on;
ylabel('y1'); % on left axis
hold on;
ylabel('y2'); % on right axis
savefig('2_plots');

[Ameer Hamza]

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]

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?

Answer 1

[Ameer Hamza]

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

[SS]

Thank you.

[Ameer Hamza]

I am glad to be of help!!