I have a set of datapoints each of which belongs to a certain cluster (group). I need to draw a polygon around each of these clusters. Does anyone knows how to do it? It doesn't matter if I use or not use the actual datapoints for drawing the polygon. I just need them to be wrapped in a polygon. ...
So if you look at my other posts, it's no surprise I'm building a robot that can collect data in a forest, and stick it on a map. We have algorithms that can detect tree centers and trunk diameters and can stick them on a cartesian XY plane. We're planning to use certain 'key' trees as natural landmarks for localizing the robot, using ...
Triangulation works by checking your angle to three KNOWN targets. "I know the that's the Lighthouse of Alexandria, it's located here (X,Y) on a map, and it's to my right at 90 degrees." Repeat 2 more times for different targets and angles. Trilateration works by checking your distance from three KNOWN targets. "I know the that's the ...
Hi, I have written an algorithm which iteratively solves the problem. The first iteration consists of 6 steps and all the following iterations consist of 5 steps (first step is skipped). What I want to calculate is the current (local) step in the iteration from current global step. For example if there are 41 steps in total which mean...
I want a method to shear an image without using the built-in functions (methods) of MATLAB. How can I do this? ...
What would be the easiest way to lightly shade (or hatch; or anything to set it different from the rest) an area in a plot(), below a curve y=x^2, for example ? x = 0:pi/10:2*pi; y = x.^2.; plot(x,y); ...
I'm writing a program in .NET that will need to utilize the statistical and data analysis functions of R or MATLAB. I have used R but am now contemplating moving to MATLAB since it has a .Net compiler while R can only interface via COM objects. Can anyone recommend going either way? I know MATLAB is infinitely more expensive than R (sinc...
I am writing a function to remove some values from a cell array, like so: function left = remove(cells, item); left = cells{cellfun(@(i) ~isequal(item, i), cells)}; But when I run this, left has only the first value, as the call to cells{} with a logical array returns all of the matching cells as separate values. How do I group these...
Matlab provides a COM interface that supports remote execution of arbitrary functions (and code snippets). In particular, it has an Feval method that calls a given Matlab function. The third parameter to this method, pvarArgOut, has COM type VARIANT*, and appears in the Visual Studio F# editor as an argument of type: pvarArgOut: byref<o...
Hi, Below is the user interface I have created to simulate LDPC coding and decoding The code sequence is decoded iteratively by passing values between the left and right nodes through the connections. The first thing it would be good to add in order to improve visualization is to add arrows to the connections in the direction of passi...
Hi, I would like to sort elements in a comma-separated list. The elements in the list are structs and I would like the list to be sorted according to one of the fields in the struct. For example, given the following code: L = {struct('obs', [1 2 3 4], 'n', 4), struct('obs', [6 7 5 3], 'n', 2)}; I would want to have a way to sort L ...
Is there a way to establish a GPIB connection using MATLAB without the instrument control Tool box? (I don't have it). Also is there a way for MATLAB to know what the external device's RS232 parameter values are ( Baud rate, stop bit etc..). For the RS232 connection I have the following code: % This function is meant to send commands to...
I've noticed that there are many different flavors of MATLAB available. Some licenses require constant contact with the licensing server, and if disconnected the client will show some message like "unable to contact licensing server, will quit if connection not re-established in X minutes." Others are stand-alone installs, without such l...
I have a structure in matlab that has a value of <1x1 struct>., its name is figurelist. Inside that structure, there is a field called images. Inside images, I have 25 images that have the name img1, img2, img3, ..... , img25. Now I made a for loop to extract those images, I basically did: For K=1:25 image(figurelist.images.imgK)...
hi every one. i need to change my loop variable inside the iterationa as ihave to acces array elements in the loop which is changing w.r.t size inside the loop. ashort piece of code is that: que=[]; que=[2,3,4]; global len; len=size(que,2) x=4; for i=1:len if x<=10 que(x)= 5; len=size(que,2) x=x+1; end end que a...
Hi, I have tried to display the matrix values in edit controls the following way: LrOut = num2str(Lr(:, :, currentPosition)); LqOut = num2str(Lq(:, :, currentPosition)); set(handles.txtLr, 'String', LrOut); set(handles.txtLq, 'String', LqOut); where txtLq and txtLr are edit controls: When the code above is executed th...
what algorithm good for image matching?to match different between two image ...
Hi there, I have a problem that I thought I knew how I can fix it, but apparently I failed .. I got a .mat file that I created, it has 2 columns and 25 rows of numbers. I would like to do a loop to get each value in the first column and put it in the X value, and the second column in the Y value. I then need to plot the points on the g...
I have the following error in my code Assignment has more non-singleton rhs dimensions than non-singleton This is the code: string =['d:\face\face\ffw' int2str(r) '_' int2str(Sel(nSelRow,t)) '.bmp']; A = imread(string); B = im2double(A); Train_Dat(:,:,s)=B; Update 1: When I updated the code we got new error in the next r...
Hi there, I have information of an object being thrown at a parabolic pattern. There are 30 images in total taken at specific intervals from the start position till the end. Now I have managed to extract the x,y coordinates of the object being thrown in all 30 images... I think that using polyfit (or maybe polyval ? ) may help me predi...