If I have two y vectors and one x vector:
y1 = [0.1,0.2,0.5,0.6];
y2 = [0.3,0.4,0.7,0.8];
x = 1:length(y1);
How can I plot all of the information on the same plot using different markers and different colors. I have tried the following:
cols = {'k','r','b',[0,0.5,0]};
markers = {'s','o','d','v'};
for i = 1:4;
plot(x(i),y1(i),markers{i},'color',cols{i},'MarkerEdgeColor',...
cols{i},'MarkerFaceColor','w');
hold on
end
ax1 = gca;
ax2 = axes('Position',get(ax1,'Position'),...
'YAxisLocation','right','XColor','k','YColor','k');
linkaxes([ax1,ax2],'x');
for i = 1:4;
plot(x(i),y2(i),markers{i},'color',cols{i},'MarkerEdgeColor',...
cols{i},'MarkerFaceColor',cols{i},'Parent',ax2);
hold on;
end
But this seems to overwrite the first plot. My aim here it to draw the first four points (y1) with the markers and colors defined, but with the maker faces in white. I then hope to include on the same figure, a second yaxis (on the right) with the values from y2, but this time with the marker faces colored according to 'cols'. How can I do this?
Addition:
When I use plotyy
for i = 1:4;
[ax,h1,h2] = plotyy(x(i),y1(i),x(i),y2(i));
hold on
set(h1,'linestyle','none','marker',markers{i},'MarkerEdgeColor',...
cols{i},'MarkerFaceColor',cols{i});
set(h2,'linestyle','none','marker',markers{i},'MarkerEdgeColor',...
cols{i},'MarkerFaceColor','w');
set(ax,{'ycolor'},{'k';'k'},{'xcolor'},{'k';'k'});
end
The xaxis values do not show up correctly, where although they are identical, they do not line up on the plot.
You can use the embedded function of Matlab , plotyy
plotyy(X1,Y1,X2,Y2) plots X1 versus Y1 with y-axis labeling on the left and plots X2 versus Y2 with y-axis labeling on the right.
check more options here.
This example graphs two mathematical functions using plot as the plotting function. The two y-axes enable you to display both sets of data on one graph even though relative values of the data are quite different.
figure
x = 0:0.01:20;
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);
[AX,H1,H2] = plotyy(x,y1,x,y2,'plot');
If you are trying with 'hold on' this solves the a-synchronized axes:
set(ax, 'XLim', [min(xaxis) max(xaxis)]);
set(ax(2),'XTick',[]);
The problem is that the background color on the overlayed plot is set to white (and opaqueness to max) so that everything underneath is invisible. Substituting the ax2 = ... statement with
ax2 = axes('Position',get(ax1,'Position'),...
'YAxisLocation','right','XColor','k','YColor','k','color','none');
should fix things.
Related
I want have a line and bar plot in a figure in MATLAB. How can I have same x-axis for both graphs? The below bar plot x-axis should be same as above x-axis. I want retain the ability of comparing figures.
Figure link: Click Here
You can use linkaxes function:
figure
ax1 = subplot(2,2,1);
x1 = linspace(0,6);
y1 = sin(x1);
plot(x1,y1)
ax2 = subplot(2,2,2);
x2 = linspace(0,10);
y2 = sin(2*x2);
plot(x2,y2)
ax3 = subplot(2,2,[3,4]);
x3 = linspace(0,16);
y3 = sin(6*x3);
plot(x3,y3)
linkaxes([ax1,ax2,ax3],'x')
usage:
linkaxes(ax) links the x- and y-axis limits of the Axes objects specified
in the vector ax. The linkaxes function chooses limits that incorporate the
current limits for all the linked axes.
linkaxes(ax, option) links the axes ax according to the specified option.
The option argument can be one of these values:
'x' Link x-axis only.
'y' Link y-axis only.
'xy' Link x-axis and y-axis.
'off' Remove linking.
Reference here: https://www.mathworks.com/help/matlab/ref/linkaxes.html
If you have a matlab older than 2006 you can follow this: https://www.mathworks.com/matlabcentral/fileexchange/7169-samexaxis-nice-subplots-with-same-x-axis
I need to make a plot with a discrete colorbar in Matlab. I do this in the following way:
data = randi(10, 20);
imagesc(data)
my_colormap = rand(10, 3);
colormap(my_colormap)
cb = colorbar
set(cb,'YTickLabel',{'A';'B';'C';'D';'E';'F';'G';'H';'I';'J';})
Now my problem is that the colorbar tick labels and the small lines in the colorbar don't align nicely. How can I even the colorbar tick labels and the small lines better as illustrated in the following pic:
The TickLabel on the colorbar each correspond to a value (a Tick). To place the TickLabels in the middle, you need to place the tick in the middle. To make this dynamic (so that It does not change when resizing the image) was I bit tricky I recall and I do not really recall. To set the ticks just once is not so hard though,
set(hCbar,'YTicks',RightYTicks);
EDIT:
On request I will post an example. This should give a hint of what to do.
x = 1:10;
y = 1:10;
cmap = jet(10);
[x, y] = meshgrid(x,y); %x and y grid
c = x-0.1; %Set color code to increase to the right
hFig = figure;
scatter(x(:),y(:),10,c(:),'filled'); % Simpler for the example
set(gca(hFig),'CLim',[0,10]);
colormap(cmap);
hCbar = colorbar;
set(hCbar,'YTicks',0.5:9.5);
set(hCbar,'YTickLabels',{'A','B','C','D','E','F','G','H','I','J'});
For newer matlab version, the YTicks may have changed name to Ticks And YTickLabels may be called TickLabels.
I would like to plot two graphs with the same x-axis but with different y-axies, one stacked above the other. There is a similar question asked below BUT it doesn't account for changes of dimensions in the y-axes. I have edited this code to do so but hope there would be a more elegant approach (maybe using a "hold on" type code).
How to plot graphs above each other in Matlab?
Here is some code which might do what you want...if I understood right. Basically you create 2 different axes in the same figure, one on top of the other, and you play around with XTick and YTick. You can start from this I guess.:
clear
close all
clc
x = 1:10;
y1 = -(x.^2);
y2 = sin(x);
figure('Units','Normalized');
hAxes1 = axes('Position',[0.1 0.1 .8 .4]);
yLim = get(hAxes1,'YLim');
Axes1Position = get(hAxes1,'Position');
NewAxesPosition = [Axes1Position(1) Axes1Position(2)+0.4 Axes1Position(3) Axes1Position(4)];
hAxes2 = axes('Position',NewAxesPosition);
plot(x,y1,'b','Parent',hAxes1);
TICK = get(hAxes1,'YTick')
set(hAxes1,'XTick',2:1:10,'YTick',TICK(1:end-1))
hold on
plot(x,y2,'r','parent',hAxes2)
set(gca,'XTick',[],'XTickLabel',[])
hold off
Giving this:
This is not optimal but due to lack of time I have to stop here :) Of course you can alter the display of the axis or the tick marks as you wish. Moreover you could use text annotations to customize the YTicks even more nicely.Hope that helps!
Example:
A = 1000;
a = 0.005;
b = 0.005;
t = 0:900;
z1 = A*exp(-a*t);
z2 = sin(b*t);
[ax,p1,p2] = plotyy(t,z1,t,z2,'semilogy','plot');
ylabel(ax(1),'Semilog Plot') % label left y-axis
ylabel(ax(2),'Linear Plot') % label right y-axis
xlabel(ax(2),'Time') % label x-axis
With reference to: http://www.mathworks.com/help/matlab/creating_plots/plotting-with-two-y-axes.html
I have a Matlab figure with two histograms on it
,
created with hist() function. Now I want to add two plots in the same figure (bell distribution actually:
,
but they have different scale. I thought I could use plotyy, but I already have my first plot-scale on the figure. How can I add the second plot-scale?
Generally, this is one way to do it:
%// example data
rng(0,'twister')
data = randn(1000,3);
x = linspace(-4,4,100);
y = 16 - x.^2;
%// generate two axes at same position
ax1 = axes;
ax2 = axes('Position', get(ax1, 'Position'),'Color','none');
%// move second axis to the right, remove x-ticks and labels
set(ax2,'YAxisLocation','right')
set(ax2,'XTick',[])
%// plot hist and line plot
hist(ax1,data); hold on
plot(ax2,x,y)
ylabel(ax1,'label of hist')
ylabel(ax2,'label of plot')
xlabel(ax1,'Hello World!')
I am looking for a way to overlay an x-y time series, say created with 'plot', on top of a display generated by 'contourf', with different scaling on the y-axes.
It seems that the typical way to do this in the case of two x-y plots is to use the built-in function 'plotyy', which can even be driven by functions other than 'plot' (such as 'loglog') as long as the input arguments remain the same (x,y). However, since in my case contourf requires three input arguments, 'plotyy' seems to not be applicable. Here is some sample code describing what I would like to do:
x1 = 1:1:50;
y1 = 1:1:10;
temp_data = rand(10,50);
y2 = rand(50,1)*20;
figure; hold on;
contourf(x1,y1,temp_data);
colormap('gray');
plot(x1,y2,'r-');
Ideally, I would like the timeseries (x1,y2) to have its own y-axes displayed on the right, and be scaled to the same vertical extent as the contourf plot.
Thanks for your time.
I don't think there's a "clean" way to do this, but you can fake it by overlaying two axes over each other.
x1 = 1:1:50;
y1 = 1:1:10;
temp_data = rand(10,50);
y2 = rand(50,1)*20;
figure;
contourf(x1, y1, temp_data);
colormap('gray');
h_ax = gca;
h_ax_line = axes('position', get(h_ax, 'position')); % Create a new axes in the same position as the first one, overlaid on top
plot(x1,y2,'r-');
set(h_ax_line, 'YAxisLocation', 'right', 'xlim', get(h_ax, 'xlim'), 'color', 'none'); % Put the new axes' y labels on the right, set the x limits the same as the original axes', and make the background transparent
ylabel(h_ax, 'Contour y-values');
ylabel(h_ax_line, 'Line y-values');
In fact, this "plot overlay" is almost definitely what the plotyy function does internally.
Here's example output (I increased the font size for legibility):