# Break X-axis in Matlab

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Babu Sankhi on 31 Jan 2022
Edited: Babu Sankhi on 3 Feb 2022
Hi All,
I have data in extreme ends (i.e. -100 to -70) and ( ( I.e. 70 to 100) . So I want to break x-axis ( eg. from -70 to 70 ) while plotting in a single plot . It would be great if you let me know how can I do it, which function can I use for that? Actually I want to plot like this;
thank you
N=(1:100)
Y=(1:2:200);
figure (1)
plot (N,Y,'ro')

Arif Hoq on 1 Feb 2022
I think you are looking for this:
x = -50*pi:0.1:50*pi;
y=10*sin(0.1*x);
figure(10)
t = tiledlayout(1,2,'TileSpacing','compact');
bgAx = axes(t,'XTick',[],'YTick',[],'Box','off');
bgAx.Layout.TileSpan = [1 2];
ax1 = axes(t);
plot(ax1,x,y)
xline(ax1,15,':');
ax1.Box = 'off';
xlim(ax1,[-100 -70])
xlabel(ax1, 'First Interval')
% Create second plot
ax2 = axes(t);
ax2.Layout.Tile = 2;
plot(ax2,x,y)
xline(ax2,45,':');
ax2.YAxis.Visible = 'off';
ax2.Box = 'off';
xlim(ax2,[70 100])
xlabel(ax2,'Second Interval')
title(t,'Attenuated Cosine Function')
Babu Sankhi on 3 Feb 2022
Edited: Babu Sankhi on 3 Feb 2022
Hi Arif,
Your second answer worked best for me . But only the problem is that How can I lessen the the distance between two plots ( so that they look like they are from same set of data and apppear very small break). See in your above plot there is wide gap beetween -70 and 70. I want to decrease that gap ,how is it possible?
thank you

Voss on 2 Feb 2022
Edited: Voss on 2 Feb 2022
Maybe an approach like this would work:
x = -20:0.1:20;
xtl = [-18 -16 -14 14 16 18];
xlim = [-19 -13; 13 19];
gap_size = 0.05;
% y = randn(size(x));
y = NaN(size(x));
y(x < 0) = 200*exp(-(x(x < 0)+16).^2/5);
y(x >= 0) = 200*exp(-(x(x >= 0)-16).^2/5);
y2 = y+randn(size(y))*10;
[xt,idx1,idx2] = x_transform(x,xlim,gap_size);
yt = [y(idx1) NaN y(idx2)];
y2t = [y2(idx1) NaN y2(idx2)];
ax = gca();
line( ...
'Parent',ax, ...
'XData',xt, ...
'YData',y2t, ...
'LineWidth',2, ...
'Color','r', ...
'Marker','o', ...
'LineStyle','none');
line( ...
'Parent',ax, ...
'XData',xt, ...
'YData',yt, ...
'LineWidth',2, ...
'Color','b');
x_text = x_transform([-16 16],xlim,gap_size);
text( ...
'Parent',ax, ...
'Position',[x_text(1) 1.1*max(y(idx1))], ...
'String','Stokes', ...
'VerticalAlignment','bottom', ...
'HorizontalAlignment','center', ...
'FontSize',20);
text( ...
'Parent',ax, ...
'Position',[x_text(end) 1.1*max(y(idx2))], ...
'String','anti-Stokes', ...
'VerticalAlignment','bottom', ...
'HorizontalAlignment','center', ...
'FontSize',20);
xtlt = x_transform(xtl,xlim,gap_size);
set(ax, ...
'Box','on', ...
'LineWidth',2, ...
'XLim',[0 1], ...
'XTick',xtlt(~isnan(xtlt)), ...
'XTickLabel',xtl);
yl = get(ax,'YLim');
set(ax,'YLimMode','manual');
patch( ...
'Parent',ax, ...
'XData',0.5+gap_size/2*[-1 0 1 0], ...
'YData',yl(1)+(yl(2)-yl(1))*[-1 1 1 -1]/30, ...
'FaceColor','w', ...
'EdgeColor','none', ...
'Clipping','off');
line( ...
'Parent',ax, ...
'XData',0.5+gap_size/2*[-1 0 NaN 1 0], ...
'YData',yl(1)+(yl(2)-yl(1))*[-1 1 NaN 1 -1]/30, ...
'Color','k', ...
'LineWidth',2, ...
'Clipping','off');
set([get(ax,'YAxis') get(ax,'XAxis')],'FontSize',20);
set( ...
get(ax,'YLabel'), ...
'String','Intensity (a.u.)', ...
'FontSize',20);
function [x,idx1,idx2] = x_transform(x,xlim,gap_size)
idx1 = x <= xlim(1,2);
idx2 = x >= xlim(2,1);
w = (1-gap_size)/2;
x = [ ...
(x(idx1)-xlim(1,1))/(xlim(1,2)-xlim(1,1))*w NaN ...
(x(idx2)-xlim(2,1))/(xlim(2,2)-xlim(2,1))*w+1-w ...
];
end

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