I want to plot a series of x and y coordinates with axes like those that are produced by wblplot. How can I achieve that? I can't use wblplot.
http://www.mathworks.se/help/stats/wblplot.html
Use semilogx to scale X axis logarithmically or for usual plot change its property
set(gca, 'XScale', 'log');
Change ticks and grid line spacing
set(gca, 'YTick', vectorOfYvalues);
set(gca, 'YGrid', vectorOfYvalues);
More on axes properties in documentation.
Related
couldn't find this:
I would like to plot a line on X and Y axis that always fits to 100% to the width or height of the figure.
figure; hold on;
plot(rand(1,100));
line(xlim,[.5 .5],'Color','red');
line([50 50],ylim,'Color','red');
pause(.5)
xlim([1 200]);% lines should now automatically extend
with grid on it's possible to get a grid that scales automatically, however it seems impossible to only limit the grid to the X/Y axes. Ideas?
after scaling:
what I would prefer:
The functions xline
and yline
were introduced in MATLAB R2018b, and do exactly as you need.
Furthermore, it is possible to add a (text) label to the line.
figure;
plot([1:10]);
set(gca, 'position', [0 0 1 1]);
I have the following scatter graph:
As you can see by the figure, I've defined a graph where each size of the grid is 5. I guess the grid follows the interval of the axis itself but I haven't quite figured out how change that (for example with a size 1), any help would be greatly appreciated!
The grid spacing is determined by the tick marks on the axes. Set the properties 'XTick' and 'YTick' of the axes to control the spacing of the grid, as follows:
set(gca, 'XTick', [50:75])
set(gca, 'YTick', [52:2:75])
I am creating a GUI in Matlab. I have several axes in which I plot different graphs. I have set in some of the axes the property XTick to []. However, each time I plot a new graph in the same axes, the xticks appear again. I know I can delete them by using set:
set(handles.axes_0, 'XTick', []);
However, this creates a "flickering" effect: you see the ticks appearing and then dissapearing each time I plot something new.
Do you know how could I have an axes with the XTick disabled avoiding the flickering effect?
Some basic code:
figure(1); %create new figure
set(gca, 'XTick', []); %Disable xtick
plot([1 2 ], [2, 3]); %Plot something. Xtick appears again
set(gca, 'XTick', []); %Disable xtick until next plot
As Shai pointed out in a comment, when using hold on the ticks don't reappear. As I want to clean the previous plot before drawing the new one, I search for its identifier using findobj and then delete it. Finally, I draw the new plot with hold on. Example (suppose the axes handle is called handles.axes_0):
h = findobj(handles.axes_0,'Type','line');
if ~isempty(h)
delete(h);
end
hold on
plot(handles.axes_0,x,y);
hold off
I have some data (a function of two parameters) stored in a matlab format, and I'd like to use matlab to plot it. Once I read the data in, I use mesh() to make a plot. My mesh() plot gives me the the value of the function as a color and a surface height, like this:
What matlab plotting function should I use to make a 2D mesh plot where the dependent variable is represented as only a color? I'm looking for something like pm3d map in gnuplot.
By default mesh will color surface values based on the (default) jet colormap (i.e. hot is higher). You can additionally use surf for filled surface patches and set the 'EdgeColor' property to 'None' (so the patch edges are non-visible).
[X,Y] = meshgrid(-8:.5:8);
R = sqrt(X.^2 + Y.^2) + eps;
Z = sin(R)./R;
% surface in 3D
figure;
surf(Z,'EdgeColor','None');
2D map: You can get a 2D map by switching the view property of the figure
% 2D map using view
figure;
surf(Z,'EdgeColor','None');
view(2);
... or treating the values in Z as a matrix, viewing it as a scaled image using imagesc and selecting an appropriate colormap.
% using imagesc to view just Z
figure;
imagesc(Z);
colormap jet;
The color pallet of the map is controlled by colormap(map), where map can be custom or any of the built-in colormaps provided by MATLAB:
Update/Refining the map: Several design options on the map (resolution, smoothing, axis etc.) can be controlled by the regular MATLAB options. As #Floris points out, here is a smoothed, equal-axis, no-axis labels maps, adapted to this example:
figure;
surf(X, Y, Z,'EdgeColor', 'None', 'facecolor', 'interp');
view(2);
axis equal;
axis off;
gevang's answer is great. There's another way as well to do this directly by using pcolor. Code:
[X,Y] = meshgrid(-8:.5:8);
R = sqrt(X.^2 + Y.^2) + eps;
Z = sin(R)./R;
figure;
subplot(1,3,1);
pcolor(X,Y,Z);
subplot(1,3,2);
pcolor(X,Y,Z); shading flat;
subplot(1,3,3);
pcolor(X,Y,Z); shading interp;
Output:
Also, pcolor is flat too, as show here (pcolor is the 2d base; the 3d figure above it is generated using mesh):
Note that both pcolor and "surf + view(2)" do not show the last row and the last column of your 2D data.
On the other hand, using imagesc, you have to be careful with the axes. The surf and the imagesc examples in gevang's answer only (almost -- apart from the last row and column) correspond to each other because the 2D sinc function is symmetric.
To illustrate these 2 points, I produced the figure below with the following code:
[x, y] = meshgrid(1:10,1:5);
z = x.^3 + y.^3;
subplot(3,1,1)
imagesc(flipud(z)), axis equal tight, colorbar
set(gca, 'YTick', 1:5, 'YTickLabel', 5:-1:1);
title('imagesc')
subplot(3,1,2)
surf(x,y,z,'EdgeColor','None'), view(2), axis equal tight, colorbar
title('surf with view(2)')
subplot(3,1,3)
imagesc(flipud(z)), axis equal tight, colorbar
axis([0.5 9.5 1.5 5.5])
set(gca, 'YTick', 1:5, 'YTickLabel', 5:-1:1);
title('imagesc cropped')
colormap jet
As you can see the 10th row and 5th column are missing in the surf plot. (You can also see this in images in the other answers.)
Note how you can use the "set(gca, 'YTick'..." (and Xtick) command to set the x and y tick labels properly if x and y are not 1:1:N.
Also note that imagesc only makes sense if your z data correspond to xs and ys are (each) equally spaced. If not you can use surf (and possibly duplicate the last column and row and one more "(end,end)" value -- although that's a kind of a dirty approach).
I also suggest using contourf(Z). For my problem, I wanted to visualize a 3D histogram in 2D, but the contours were too smooth to represent a top view of histogram bars.
So in my case, I prefer to use jucestain's answer. The default shading faceted of pcolor() is more suitable.
However, pcolor() does not use the last row and column of the plotted matrix. For this, I used the padarray() function:
pcolor(padarray(Z,[1 1],0,'post'))
Sorry if that is not really related to the original post
I plot a single trace in MATLAB with plot(). I'd like to add a right-y axis with a different set of tick marks (scaled linearly). Is this possible?
There are a number of good suggestions on this closely related question, although they deal with a more complicated situation than yours. If you want a super-simple DIY solution, you can try this:
plot(rand(1, 10)); % Plot some random data
ylabel(gca, 'scale 1'); % Add a label to the left y axis
set(gca, 'Box', 'off'); % Turn off the box surrounding the whole axes
axesPosition = get(gca, 'Position'); % Get the current axes position
hNewAxes = axes('Position', axesPosition, ... % Place a new axes on top...
'Color', 'none', ... % ... with no background color
'YLim', [0 10], ... % ... and a different scale
'YAxisLocation', 'right', ... % ... located on the right
'XTick', [], ... % ... with no x tick marks
'Box', 'off'); % ... and no surrounding box
ylabel(hNewAxes, 'scale 2'); % Add a label to the right y axis
And here's what you should get:
You may try this submission to MATLAB File Exchange - PLOT2AXES.
PLOT2AXES example http://www.mathworks.com/matlabcentral/fx_files/7426/2/plot2axes.png
Jiro's solution is good (file Exchange function), however, it does not allow to use Matlab's built-in plot functions (bar, scatter, etc.), and you have to use plot2axes instead. Matlab's own help gives the solution to have two axes on any type of plots:
ax2 = axes('Position',get(ax1,'Position'),...
'XAxisLocation','top',...
'YAxisLocation','right',...
'Color','none',...
'XColor','k','YColor','k');
Look at: http://www.mathworks.com/help/techdoc/creating_plots/f1-11215.html
From matlab 2016 and onwards there is an option to define on what axis one plots:
yyaxis left
plots...
yyaxis right
plots...
source:
https://se.mathworks.com/help/matlab/ref/yyaxis.html
Open MATLAB Help with F1 and take a look at the functions below function plot which you mentioned, there you will see plotyy. This is what you probably need.
UPDATE: actually plotyy is NOT the answer to the question as pointed by gnovice.
I was able to do it with the following after plotting the left axis graph:
yyaxis right
ylabel('Right axis label')
plot(x,y1) % plot your right axis graph
Hope it helps.