MATLAB: How to subplot graphs with more than 4 y-axis in a figure

subplot y-axis ploty4

Hi everyone,
I want to plot 2 graphs in a figure, and each graph contains 4 lines such that 4 y-axis is needed. Thanks to ploty4.m (developed by Peter Bodin available on the FILEEXCHANGE), the multi-axis problem is well done. But the new problem is that each graph just pops up as individual figure instead of being in a figure. I have attached the code and the result.I don't know how to deal with it or how it comes into being.
Could anybody please kindly give me one hand? Thank you in advance.
Best,
LIU
The ploty4.m is as follows:
function [ax,hlines] = plotyyyy(x1,y1,x2,y2,x3,y3,x4,y4,ylabels)
%PLOTY4 Extends plotyy to include a third and fourth y-axis
%




% Syntax: [ax,hlines] = ploty4(x1,y1,x2,y2,x3,y3,x4,y4,ylabels)
%
% Inputs: x1,y1 are the xdata and ydata for the first axes' line
% x2,y2 are the xdata and ydata for the second axes' line
% x3,y3 are the xdata and ydata for the third axes' line
% x4,y4 are the xdata and ydata for the fourth axes' line
% ylabels is a 4x1 cell array containing the ylabel strings (optional)
%
% Outputs: ax - 4x1 double array containing the axes' handles
% hlines - 4x1 double array containing the lines' handles
%
% Example:
% x = 0:10;
% y1=x; y2=x.^2; y3=x.^3; y4=x.^4;
% ylabels{1} = 'First y-label';
% ylabels{2} = 'Second y-label';
% ylabels{3} = 'Third y-label';
% ylabels{4} = 'Fourth y-label';
% [ax,hlines] = ploty4(x,y1,x,y2,x,y3,x,y4,ylabels);
% leghandle = legend(hlines, 'y = x','y = x^2','y = x^3','y = x^4',2);
%
% See also Plot, Plotyy
% Denis Gilbert, Ph.D.
% Check inputs
msg=nargchk(8,9,nargin);
error(msg);
% Create figure window
figure('units','normalized',...
'DefaultAxesXMinorTick','on','DefaultAxesYminorTick','on');
%Plot the first two lines with plotyy
[ax,hlines(1),hlines(2)] = plotyy(x1,y1,x2,y2);
cfig = get(gcf,'color');
pos = [0.1 0.1 0.65 0.8];
offset = pos(3)/24;
%Reduce width of the two axes generated by plotyy
pos(1) = pos(1) + offset;
pos(3) = pos(3) - offset;
set(ax,'position',pos);
%Determine the position of the third/fourth axes
pos3 = [pos(1) pos(2) pos(3)+offset pos(4)];
pos4 = [pos(1) - offset pos(2) pos(3)+offset pos(4)];
%Determine the proper x-limits for the third and fourth axes
scale3 = pos3(3)/pos(3);
scale4 = pos4(3)/pos(3);
limx1 = get(ax(1),'xlim');
limx3 = [limx1(1) limx1(1)+scale3*(limx1(2)-limx1(1))];
limx4 = [limx1(2)-scale4*(limx1(2)-limx1(1)) limx1(2)];
%Create ax(3) & ax(4)
ax(3) = axes('Position',pos3,'box','off',...
'Color','none','XColor',cfig,'YColor','r',...
'xtick',[],'xlim',limx3,'yaxislocation','right');
ax(4) = axes('Position',pos4,'box','off',...
'Color','none','XColor',cfig,'YColor','k',...
'xtick',[],'xlim',limx4,'yaxislocation','left');
%Plot x3,y3,x4,y4
hlines(3) = line(x3,y3,'Color','r','LineStyle','--','Parent',ax(3));
hlines(4) = line(x4,y4,'Color','k','LineStyle','-.','Parent',ax(4));
%Put ax(2) on top;
axes(ax(2));
%Set y-labels;
if nargin==9
set(cell2mat(get(ax,{'ylabel'})),{'String'},{ylabels{:}}');
end
*THen run directly the following code in the command window of Matlab:*
    figure 
    subplot(2,1,1) 
    x = 0:10;
    y1=x; y2=x.^2; y3=x.^3; y4=x.^4;
    [ax,hlines] = plotyyyy(x,y1,x,y2,x,y3,x,y4);
    subplot(2,1,2) 
    x = 0:10;
    y1=x; y2=x.^2; y3=x.^3; y4=x.^4;
    [ax,hlines] = plotyyyy(x,y1,x,y2,x,y3,x,y4);

Best Answer

Use the ploty4 version attached. I have modified it to do what you want. You can use it like this:
h1 = subplot(2,1,1);
x = 0:10;
y1=x; y2=x.^2; y3=x.^3; y4=x.^4;
[ax,hlines] = plotyyyy(h1,x,y1,x,y2,x,y3,x,y4);
h2 = subplot(2,1,2);
x = 0:10;
y1=x; y2=x.^2; y3=x.^3; y4=x.^4;
[ax,hlines] = plotyyyy(h2,x,y1,x,y2,x,y3,x,y4);
my output:
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