I have created a simple polar plot like this:
polar(direction, power, 'k.')
title('this is my title')
Only the title overlaps the numbers at the top of the circle.
How do I shift the plot down / title up or create room to do so? I would have thought MATLAB would adjust itself automatically?
You can modify the call to title so that it returns a handle, which you can then use to adjust the position.
t = title('this is my title');
get(t,'Position')
ans =
-0.0024 1.1810 1.0001
set(t,'Position',get(t,'Position')+[0 .01 0]); % move up slightly
The default position of the title is expressed as a fraction relative to the current plot axes, which are based on the figure window size. So you may see overlap if the window is small. Enlarging the window may solve the problem for you without the need for doing anything else.
You can also shift the plot around by adjusting its Position -- but since the title's position is fixed to the plot axes, the title will just shift with the plot. But this can be useful with the solution above if the space above the plot is crowded.
get(gca,'Position')
ans =
0.1300 0.1100 0.7750 0.8150
set(gca,'Position',[.13,.10,.775,.815]); % move plot down a bit
For what it is worth, you can also place text in an arbitrary position using the 'text' command.
Related
I'm the MatLab newbie and I need some help to create a linear and non-linear axis in one chart.
I need to make chart with 2 different X-axes. One X-axis displays 1000/T at the bottom and the second X-axis displays a T at the top of the chart.
Example figure:
Do you have any idea how to solve this problem in MatLab?
Thanks.
This can be done by simply creating a second axes object at the same place as the first. Let's first create some data:
x1 = 1:0.1:3.5;
x2 = 1./x1;
y = (0.5*(x1-2)).^3;
Now we can create a normal plot with the first axes, and get the axes handle:
plot(x1,y,'-r');
ax(1) = gca;
Then we create the second axes object, at the same position as the first, and make the color none so it is transparent and the plot from below is still visible. As this adds a second Y axis too, we simply remove the Y ticks of the second axis.
ax(2) = axes('Position',ax(1).Position,'XAxisLocation','top','Color','none');
set(ax(2),'YTick',[]);
Now lets just format the second X axis as we like. Let's set the limits to the minimum and maximum of the x2 vector, and make it logarithmic:
set(ax(2),'XLim',[min(x2),max(x2)]);
set(ax(2),'XScale','log');
Now we still have the problem that the XTicks of ax(1) are also displayed at the top, and the XTicks of ax(2) are displayed at the bottom. This can be fixed by removing the box around the existing axes and creating a third axis without any ticks but with a box.
box(ax(1),'off');
box(ax(2),'off');
ax(3) = axes('Position',ax(1).Position,'XTick',[],'YTick',[],'Box','on','Color','none');
Now finally we can link the axes to be able to zoom correctly
linkaxes(ax);
And that should be it...
There is documentation for having a graph with two y-axes on the Mathworks website . .
http://de.mathworks.com/help/matlab/creating_plots/plotting-with-two-y-axes.html
It should be trivial to covert the concepts to the x-axis.
I struggle a little bit with overlapping axis numbers of the y and x axis like it is shown in the image. I'd like to keep the size of the numbers and therefore think that simply shifting the numbers away from the axis itself would be an appropriate way to handle this issue.
Is there a possibility to do that?
Thanks in advance,
Joe
Here is a little workaround using text annotations. Basically you clear the current XTick labels and replace them with similar labels, but you can specify the distance from the axis:
clc
clear
close all
x = 1:20;
hPlot = plot(x,sin(x));
set(gca,'xaxisLocation','top');
set(gca,'XTickLabel',[]); %// Clear current XTickLabel
ylim = get(gca,'YLim'); %// Get y limit of the plot to place your text annotations.
for k = 2:2:20
text(k,ylim(2)+0.1,num2str(k),'HorizontalAlignment','Center') %// Play with the 'ylim(1) -0.1' to place the label as you wish.
end
Giving this:
Of course now it's exaggerated and you can do the same for the y axis if you want (using the 'XLim' property of the current axis,gca).
I use some things from this question get-rid-of-the-white-space-around-matlab-figures-pdf-output to get rid of the white space when saving figure plots and images. This works fine, but my problem is when I use commands like "axis square" or "axis image". Ivt sets TightInset property of corresponding axes to 0 in "y" direction. I mean when I use this:
inset=get(a,'TightInset');
second and fourth numbers in "inset" are always zero, even if I set title and x-label. So in the end I don't see plot titles and x-labels.
Can I fix it somehow? So far I do it manually by adding some suitable number, but it is not convenient.
EDIT: Some more code for example. It displays two histograms.
h=figure;
subplot(121)
bar(bins,histogram1,'hist');
axis square
title('Historgram 1');
xlabel('Intensity');
ylabel('Pixel count');
set(gca,'xlim',[0 1])
subplot(122)
bar(bins,histogram_out,'hist');
axis square
title('Histogram 2');
set(gca,'xlim',[0 1])
xlabel('Intensity');
ylabel('Pixel count');
and if I call
a=get(h,'Children');
for i=1:length(a)
inset=get(a(i),'TightInset');
%...some stuff here
end
those y-related numbers in inset are zeros. If I comment axis square and do this, then inset are correct and it does what I need.
As far as I know when you use 'TightInset' you'll get only the graph or image, axis will be removed. I downloaded a function from mathworks file exchange 'saveTightfigure.m' to solve a similar problem. But I did not needed axes. If you need axes may be you can edit limits set inside the function. I mean you can give a little more space at left and bottom for keeping the axes.
I'd like to zoom in on a plot using a script. I'm only interested in horizontally constrained zooming. So I'd like to do something like
p = plot(myData);
z = zoom;
set(z, 'ZoomInToPoints' , [50 100]);
or
p = plot(myData);
myZoom([50, 100]);
So either of these functions would zoom into a plot like when you zoom in with the magnifying glass tool. I only specify two points because I only want to zoom horizontally.
Note, I've already tried to use xlim for this. While it works, it doesn't let me use the command text on my plots, which I need.
Calls to text will fix the text at a specific set of coordinates on the graph. Have you tried updating these after calling xlim?
EDIT: You can always adjust the text position:
x=1:.1:10;
y=sin(.1*x);
plot(x,y)
text(6,.8,'test') %#Sample figure
F=get(0,'children'); %#Figure handle
A=get(F,'Children'); %#Axes handle
T=findobj(A,'Type','text'); %# Text handle
oldxlim=xlim; %#grab the original x limits before zoom
oldpos=get(T,'Position'); %#get the old text position
set(A,'xlim',[5 15]); %#Adjust axes
newxlim=xlim;
newpos=[(oldpos(1)-oldxlim(1))*(diff(newxlim))...
/(diff(oldxlim))+newxlim(1) oldpos(2:end)];
%#interpolate to place the text at the same spot in the axes
set(T,'Position',newpos) %#Finally reset the text position
Not pretty, but it should work. If you have more than one annotation per axes or axes per figure, you can always throw the above code in a loop.
What is the problem with text and xlim? Is this not the type of behavior you want?
plot(1:100,randn(100,1))
text(80,1.5,'text')
set(gca,'XLim',[70 100]) % notice that text stays at same point in "data space" but moves in "axis space"
text(80,1,'text2'); % new text appears in axis space as well
If I'm misunderstanding and you want text to appear at a specific point in your axis space (not the data space that text uses) regardless of how zoomed in you are, you can create another set of axes for your text:
inset_h = axes('position',[0.5 0.5 0.2 0.2])
set(inset_h,'Color','none'); axis off
text(0,0,'text')
How do you take one plot and place it in the corner (or anywhere for that matter) of another plot in MATLAB?
I have logarithmic data that has a large white space in the upper right-hand side of the plot. In the white space I would like to overlay a smaller plot containing a zoomed in version of the log plot in that white space (sort of like a magnified view).
Before you tell me it can't be done, I would like to mention that I have seen it in action. If my description is lacking, just let me know and I'll attempt to better describe it to you.
An example:
x = 1:20;
y = randn(size(x));
plot(x, y,'LineWidth',2)
xlabel('x'), ylabel('y'), title('Plot Title')
h = axes('Position', [.15 .65 .2 .2], 'Layer','top');
bar(x,y), title('Bar Title')
axis(h, 'off', 'tight')
You can use axes properties 'position' and 'units' and make them overly. Pay attention to create small axes after big one or use uistack() function so that big does not hide small one.
What you can not do is to make an axes child of another one (like Mathworks do with legend). But you do not need it anyway.
For the second plot you have to use axes and line instead of plot and hold on.
Units as 'normalized' (which is default) allows uniform resizable look when parent figure is being resized (e.g. manually maximized).