I am supposed to represent the legend as a 2X3 matrix including the line style in the matrix (like dashed represent one curve, straight line represents other curve).
I did lot of google search but did not really get anything. Legend flex also didn't work.
Can you kindly suggest how can I align my legend data manually in a matrix form ??
Well, I realized there are no such formats supported on Matlab legend formats. Therefore, I ended up editing the text box with extra spaces and symbols. However, I still believe there is a way to insert a matrix on the plots like legends.
Related
I have 8 plots which I want to implement in my Matlab code. These plots originate from several research papers, hence, I need to digitize them first in order to be able to use them.
An example of a plot is shown below:
This is basically a surface plot with three different variables. I know how to digitize a regular plot with just X and Y coordinates. However, how would one digitize a graph like this? I am quite unsure, hence, the question.
Also, If I would be able to obtain the data from this plot. How would you be able to utilize it in your code? Maybe with some interpolation and extrapolation between the given data points?
Any tips regarding this topic are welcome.
Thanks in advance
Here is what I would suggest:
Read the image in Matlab using imread.
Manually find the pixel position of the left bottom corner and the upper right corner
Using these pixels values and the real numerical value, it is simple to determine the x and y value of every pixel. I suggest you use meshgrid.
Knowing that the curves are in black, then remove every non-black pixel from the image, which leaves you only with the curves and the numbers.
Then use the function bwareaopen to remove the small objects (the numbers). Don't forget to invert the image to remove the black instead of the white.
Finally, by using point #3 and the result of point #6, you can manually extract the data of the graph. It won't be easy, but it will be feasible.
You will need the data for the three variables in order to create a plot in Matlab, which you can get either from the previous research or by estimating and interpolating values from the plot. Once you get the data though, there are two functions that you can use to make surface plots, surface and surf, surf is pretty much the same as surface but includes shading.
For interpolation and extrapolation it sounds like you might want to check out 2D interpolation, interp2. The interp2 function can also do extrapolation as well.
You should read the documentation for these functions and then post back with specific problems if you have any.
Is it possible to make Matlab to apply different line styles automatically as it does with colors when told to plot a higher dimension array?
For example:
plot(t,X1(:,4:6))
Creates a plot with three lines of different color. Can Matlab do the same thing with line styles? Even if it is something like:
plot(t,X1(:,4:6),{':','-','-*'})
I'd rather not have to go and call a plot command for each 1D array individually and assign a line style there if I can help it. I'm working with legacy code that has a ton of calls without line styles already, each plotting a half dozen lines. It would take a while to do manually and I have to think Matlab can do something smarter
Thanks!
You can do it in one command, but you still have to assign the style separately.
plot(t,X1(:,4),':',t,X1(:,5),'-',t,X1(:,6),'-*')
The other option you have is to write your own function that goes through a for loop and plots each one with different styles.
I want to create a 5 dimensional plotting in matlab. I have two files in my workspace. one is data(150*4). In this file, I have 150 data and each has 4 features. Since I want to classify them, I have another file called "labels" (150*1) that includes a label for each data in data files. In other words the label are the class of data and I have 3 class: 1,2,3
I want to plot this classification, but i can't...
Naris
You need to think about what kind of plot you want to see. 5 dimensions are difficult to visualize, unless of course, your hyper-dimensional monitor is working. Mine never came back from the repair shop. (That should teach me for sending it out.)
Seriously, 5 dimensional data really can be difficult to visualize. The usual solution is to plot points in a 2-d space (the screen coordinates of a figure, for example. This is what plot essentially does.) Then use various attributes of the points plotted to show the other three dimensions. This is what Chernoff faces do for you. If you have the stats toolbox, then it looks like glyphplot will help you out. Or you can plot in 3-d, then use two attributes to show the other two dimensions.
Another idea is to plot points in 2-d to show two of the dimensions, then use color to indicate the other three dimensions. Thus, the RGB assigned to that marker will be defined by the other three dimensions. Of course, that means you must be able to visualize what the RGB coordinates of a color represent, so you need to understand color as it is represented in an RGB space.
You can use scatter3 to plot your data, using three features of data as dimensions, the fourth as color, and the class as different markers
figure,hold on
markerList = 'o*+';
for iClass = 1:nClasses
classIdx = dataClass==iClass;
scatter3(data(classIdx,1),data(classIdx,2),data(classIdx,3),[],data(classIdx,4),...
'marker',markerList(iClass));
end
When you use color to represent one of the features, I suggest to use a good colormap, such as pmkmp from the Matlab File Exchange instead of the default jet.
Alternatively, you can use e.g. mdscale to transform your higher-dimensional data to 2D for standard plotting.
There's a model called SOM (Self-organizing Maps) which builds a 2-D image of a multidimensional space.
How can I make grid lines bigger (more fat for printing purpose) in my matlab figures?
I'm including matlab figures in to my .tex document after using the following
print -depsc testFig.eps
to convert the figure into .eps for inclusion in my .tex doc.
But my grid lines don't look good at all. i.e they appear faint when I print the document. Is there anyway I can increase the size/width of the grid lines?
If you use
set(gca,'LineWidth',10)
after "grid on" this should increase the boarders of all axes, including the grid lines.
I would like to plot a vertical line (I'd prefer any orientation, but I'd be happy with just vertical right now) with two-color dashes, say red-blue-red-blue-...
I know I could do it like this:
plot([1,1],[0,1],'r'),
hold on,
plot([1,1],[0,1],'--b')
However, since I need to be able to move the line, among others, it should only have a single handle. How could I do this?
EDIT
Thank you for your answers. I guess I should indeed give some more information.
I have some data that is classified into different parts. I want to be able to manually adjust the boundaries between classes. For this, I'm drawing vertical lines at the classification boundaries and use draggable to allow moving the lines.
For the boundary between the red and the blue class, I'd like to have a red/blue line.
plot(ones(10,1),linspace(0,1,10),'-bs','MarkerFaceColor','r','MarkerEdgeColor','none','linewidth',6)
is what I'm actually using at the moment. However, it's not so pretty (if I want equal spacing, it becomes a real pain, and I want to give both colors the same weight), and I would like to have the possibility to use three colors (and not with marker edge and face being different, because it makes my eyes bleed).
Unfortunately, draggable does not allow me to use multiple handles, and grouping the lines with hggroup does not seem to create a draggable object.
cline looks like a promising approach, but rainbow colors won't work for my application.
You can use the code you have, and just concatenate the handles from each line into a vector of handles. When you want to change the properties of both lines simultaneously, the SET function is able to accept the vector of handles as an argument. From the documentation for SET:
set(H,'PropertyName',PropertyValue,...)
sets the named properties to the
specified values on the object(s)
identified by H. H can be a vector of
handles, in which case set sets the
properties' values for all the
objects.
Here's an example:
h1 = plot([1 1],[0 1],'r'); %# Plot line 1
hold on;
h2 = plot([1 1],[0 1],'--b'); %# Plot line 2
hVector = [h1 h2]; %# Vector of handles
set(hVector,'XData',[2 3]); %# Shifts the x data points for both lines
UPDATE: Since you mention you are using draggable from the MathWorks File Exchange, here's an alternate solution. From the description of draggable:
A function which is called when the
object is moved can be provided as an
optional argument, so that the
movement triggers further actions.
You could then try the following solution:
Plot your two lines, saving the handle for each (i.e. h1 and h2).
Put the handle for each in the 'UserData' property of the other:
set(h1,'UserData',h2);
set(h2,'UserData',h1);
Create the following function:
function motionFcn(hMoving) %# Currently moving handle is passed in
hOther = get(hMoving,'UserData'); %# Get the other plot handle
set(hOther,'XData',get(hMoving,'XData'),... %# Update the x data
'YData',get(hMoving,'YData')); %# Update the y data
end
Turn on draggable for both lines, using the above function as the one called when either object is moved:
draggable(h1,#motionFcn);
draggable(h2,#motionFcn);
I've never used it, but there's a submission by Sebastian Hölz called CLINE on the Mathworks File Exchange that seems related.
I don't know how to do exactly what you want, but presumably the reason you want to do this is to have some way of distinguishing this line from other lines. Along those lines, take a look at MathWorks' documentation on 2-D line plots. Specifically, this example:
plot(x,y,'--rs','LineWidth',2,...
'MarkerEdgeColor','k',...
'MarkerFaceColor','g',...
'MarkerSize',10)
should give you plenty of ideas for variation. If you really need the two-color dashes, it might help to specify why. That way, even if we can't answer the question, perhaps we can convince you that you don't really need the two-color dashes. Since you've already ruled out the over-lapping solution, I'm fairly certain there's no solution that answers all of your needs. I'm assuming the two-colorness is the most fluid of those needs.