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  • Setting XTick or XLabels for a plot containing millisecond data

    - by Dave
    I am trying to set the X-Axis labels on a plot. I have a vector of times, these go down to the millisecond level. I have tried setting both XTick and XTickLabel properties but things are not working correctly (labels are not valid). Any suggestions on what one needs to do to get datetick to work when working with times that go down to the second/millisecond level? Are there any alternatives to using datetick? Any suggestions are appreciated.

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  • Evenly distribute range of specified values within a vector

    - by nofunsally
    I have a vector A and I want to populate it with values as evenly as possible. For example, if A is 1x30 and I want to use three values I would use a code like this below: % A = zeros(1,30); A([1:10])=0; A([11:20])=1; A([21:30])=2; This works, but seems a bit cumbersome to me. Is there a more elegant way to evenly (as possible) distribute a specified range of values within a vector? I am intent on keeping each of the values in "clumps." Thank you kindly in advance.

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  • Why closed contours are guaranteed here?

    - by user198729
    Quoted from here: BW = edge(I,'zerocross',thresh,h) specifies the zero-cross method, using the filter h. thresh is the sensitivity threshold; if the argument is empty ([]), edge chooses the sensitivity threshold automatically. If you specify a threshold of 0, the output image has closed contours, because it includes all the zero crossings in the input image. I don't understand it,can someone elaborate?

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  • Plotting data with meshgrid

    - by Ruby
    When you use meshgrid to plot data (using meshgrid itself not one of the other plotting functions), how do you change the color to grayscale or black and white? Also, how do you get rid of the "meshy" look of the image?

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  • incapsulation of a code inmatlab

    - by user531225
    my code is pathname=uigetdir; filename=uigetfile('*.txt','choose a file name.'); data=importdata(filename); element= (data.data(:,10)); in_array=element; pattern= [1 3]; locations = cell(1, numel(pattern)); for p = 1:(numel(pattern)) locations{p} = find(in_array == pattern(p)); end idx2 = []; for p = 1:numel(locations{1}) start_value = locations{1}(p); for q = 2:numel(locations) found = true; if (~any((start_value + q - 1) == locations{q})) found = false; break; end end if (found) idx2(end + 1) = locations{1}(p); end end [m2,n2]=size(idx2) res_name= {'one' 'two'}; res=[n n2]; In this code I finding a pattern in one of the column of my data file and counting how many times it's repeated. I have like 200 files that I want to do the same with them but unfotunatlly I'm stuck. this is what I have added so far pathname=uigetdir; files=dir('*.txt'); for k=1:length(files) filename=files(k).name; data(k)=importdata(files(k).name); element{k}=data(1,k).data(:,20); in_array=element;pattern= [1 3]; locations = cell(1, numel(pattern)); for p = 1:(numel(pattern)) locations{p} = find(in_array{k}== pattern(p)); end idx2{k} = []; how can I continue this code..??

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  • Set all nonzero matrix elements to 1 (while keeping the others 0)

    - by Tomas Lycken
    I have a mesh grid defined as [X, Y, Z] = meshgrid(-100:100, -100:100, 25); % z will have more values later and two shapes (ovals, in this case): x_offset_1 = 40; x_offset_2 = -x_offset_1; o1 = ((X-x_offset_1).^2./(2*Z).^2+Y.^2./Z.^2 <= 1); o2 = ((X-x_offset_2).^2./(2*Z).^2+Y.^2./Z.^2 <= 1); Now, I want to find all points that are nonzero in either oval. I tried union = o1+o2; but since I simply add them, the overlapping region will have a value of 2 instead of the desired 1. How can I set all nonzero entries in the matrix to 1, regardless of their previous value? (I tried normalized_union = union./union;, but then I end up with NaN in all 0 elements because I'm dividing by zero...) Follow-up question: I got a perfect answer to my original question, but now I have a follow-up question on the same problem. I'm going to define a filled disc, c = (X.^2+Y.^2<R^2) that will also overlap with the two ovals. How do I find all the points that are inside the circle, but not inside any of the ovals?

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  • For Loop not advancing

    - by shizishan
    I'm trying to read in a large number of jpg files using a for loop. But for some reason, the k index is not advancing. I just get A as a 460x520x3 uint8. Am I missing something? My goal with this code is to convert all the jpg images to the same size. Since I haven't been able to advance through the images, I can't quite tell if I'm doing it right. nFrames = length(date); % Number of frames. for k = 1:nFrames-1 % Number of days % Set file under consideration A = imread(['map_EUS_' datestr(cell2mat(date_O3(k)),'yyyy_mm_dd') '_O3_MDA8.jpg']); % Size of existing image A. [rowsA, colsA, numberOfColorChannelsA] = size(A); % Read in and get size of existing image B (the next image). B = imread(['map_EUS_' datestr(cell2mat(date_O3(k+1)),'yyyy_mm_dd') '_O3_MDA8.jpg']); [rowsB, colsB, numberOfColorChannelsB] = size(B); % Size of B does not match A, so resize B to match A's size. B = imresize(B, [rowsA colsA]); eval(['print -djpeg map_EUS_' datestr(cell2mat(date_O3(k)),'yyyy_mm_dd') '_O3_MDA8_test.jpg']); end end

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  • How do I classify using GLCM and SVM Classifier in Matlab?

    - by Gomathi
    I'm on a project of liver tumor segmentation and classification. I used Region Growing and FCM for liver and tumor segmentation respectively. Then, I used Gray Level Co-occurence matrix for texture feature extraction. I have to use Support Vector Machine for Classification. But I don't know how to normalize the feature vectors. Can anyone tell how to program it in Matlab? To the GLCM program, I gave the tumor segmented image as input. Was I correct? If so, I think, then, my output will also be correct. My glcm coding, as far as I have tried is, I = imread('fzliver3.jpg'); GLCM = graycomatrix(I,'Offset',[2 0;0 2]); stats = graycoprops(GLCM,'all') t1= struct2array(stats) I2 = imread('fzliver4.jpg'); GLCM2 = graycomatrix(I2,'Offset',[2 0;0 2]); stats2 = graycoprops(GLCM2,'all') t2= struct2array(stats2) I3 = imread('fzliver5.jpg'); GLCM3 = graycomatrix(I3,'Offset',[2 0;0 2]); stats3 = graycoprops(GLCM3,'all') t3= struct2array(stats3) t=[t1;t2;t3] xmin = min(t); xmax = max(t); scale = xmax-xmin; tf=(x-xmin)/scale Was this a correct implementation? Also, I get an error at the last line. My output is: stats = Contrast: [0.0510 0.0503] Correlation: [0.9513 0.9519] Energy: [0.8988 0.8988] Homogeneity: [0.9930 0.9935] t1 = Columns 1 through 6 0.0510 0.0503 0.9513 0.9519 0.8988 0.8988 Columns 7 through 8 0.9930 0.9935 stats2 = Contrast: [0.0345 0.0339] Correlation: [0.8223 0.8255] Energy: [0.9616 0.9617] Homogeneity: [0.9957 0.9957] t2 = Columns 1 through 6 0.0345 0.0339 0.8223 0.8255 0.9616 0.9617 Columns 7 through 8 0.9957 0.9957 stats3 = Contrast: [0.0230 0.0246] Correlation: [0.7450 0.7270] Energy: [0.9815 0.9813] Homogeneity: [0.9971 0.9970] t3 = Columns 1 through 6 0.0230 0.0246 0.7450 0.7270 0.9815 0.9813 Columns 7 through 8 0.9971 0.9970 t = Columns 1 through 6 0.0510 0.0503 0.9513 0.9519 0.8988 0.8988 0.0345 0.0339 0.8223 0.8255 0.9616 0.9617 0.0230 0.0246 0.7450 0.7270 0.9815 0.9813 Columns 7 through 8 0.9930 0.9935 0.9957 0.9957 0.9971 0.9970 ??? Error using ==> minus Matrix dimensions must agree. The images are:

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  • How is network mounted software executed?

    - by CptSupermrkt
    I would like to understand how network mounted software works. For example, at my place of work, we have a software server. Each client machine (hundreds of them) automatically mounts directories from the software server on boot. For example, a program like Matlab is installed just once on the software server, but each client machine can start up an instance of Matlab. What is going on under the hood? Let's say I run /opt/bin/matlab and /opt/ is mounted from the software server, what happens when I press Enter to execute matlab on a client machine? The process is on the client machine, and I've already narrowed down that there isn't any implicit or hidden file transfer (i.e. copying matlab to my machine temporarily for that session) by running matlab on a computer with nearly zero disk space (i.e. not enough room to transfer). Since Matlab was installed on the server, how is my client computer executing it? What mechanism is controlling this? What is happening behind the scenes?

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  • MATLAB is changing variables when I do not want it to.

    - by WVUstudent
    Here is my problem in a small bit of code used as an example, trial(0) function [] = trial(test) disp(test) if(test == 1) disp('test is one') test = 0; end disp(test) Matlab prints out this: 0 'test is one' 0 This is not my real code, there are over 500 lines of it, but this is a section of my code where the problem has risen. I have used the search function to see if I have been incrementing any variables anywhere, and have put in over 2 hours trying to see why MATLAB is changing my variables when I don't want it to.

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  • Does anyone know any good MATLAB code for rumor routing?

    - by Shruti Rattan
    I am looking for a MATLAB code that works for rumor routing. In rumor routing, some N nodes are generated first and randomly one of the nodes generates an 'Agent'. Agent carries the information where it is comming from and what information (like temperature, humidity,etc) is it looking for and what all nodes has it traversed through (basically the path to where it originated). Also another agent is generated by some other node that has some information to share (like temperature or humidity level of an area) to any other node looking for it. Now if the information seeker agent (former) path intersects the path followed by information giving agent (later) and if the information happens to be the same, then the path is made and used for the same information exchange. But there is another problem. The path has to be shortest path available between them depending upon how many intermediate nodes needed to be passed to reach destination node. Now I know its a lot of work but even a little help will be appreciated. Thanks guys

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  • scipy.io typeerror:buffer too small for requested array

    - by kartiku
    I have a problem in python. I'm using scipy, where i use scipy.io to load a .mat file. The .mat file was created using MATLAB. listOfFiles = os.listdir(loadpathTrain) for f in listOfFiles: fullPath = loadpathTrain + '/' + f mat_contents = sio.loadmat(fullPath) print fullPath Here's the error: Traceback (most recent call last): File "tryRankNet.py", line 1112, in demo() File "tryRankNet.py", line 645, in demo mat_contents = sio.loadmat(fullPath) File "/usr/lib/python2.6/dist-packages/scipy/io/matlab/mio.py", line 111, in loadmat matfile_dict = MR.get_variables() File "/usr/lib/python2.6/dist-packages/scipy/io/matlab/miobase.py", line 356, in get_variables getter = self.matrix_getter_factory() File "/usr/lib/python2.6/dist-packages/scipy/io/matlab/mio5.py", line 602, in matrix_getter_factory return self._array_reader.matrix_getter_factory() File "/usr/lib/python2.6/dist-packages/scipy/io/matlab/mio5.py", line 274, in matrix_getter_factory tag = self.read_dtype(self.dtypes['tag_full']) File "/usr/lib/python2.6/dist-packages/scipy/io/matlab/miobase.py", line 171, in read_dtype order='F') TypeError: buffer is too small for requested array The whole thing is in a loop, and I checked the size of the file where it gives the error by loading it interactively in IDLE. The size is (9,521), which is not at all huge. I tried to find if I'm supposed to clear the buffer after each iteration of the loop, but I could not find anything. Any help would be appreciated. Thanks.

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  • Remote Program (via ssh) suspends when leaving client computer

    - by Philipp F
    I'm working with MATLAB on a remote computer logging in via ssh -X remotepc and running matlab like matlab &. When I start a long-running process and leave the computer, it seems to suspend the process (after like 30mins being away) such that there is nearly no progress over night. As soon as I come back and wake up the client, the remote process continues with the calculation. I can see this from the load-average values (uptime) Why is that and how can I change this behaviour?

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  • Windows 7 blocks network access to network-installed apps

    - by VokinLoksar
    Windows 2008 R2 domain. Users, running Windows 7 Enterprise, are trying to run some software from a network share. Specifically, I've tested this with MATLAB and PuTTY. When starting, MATLAB has to contact a licensing server to get its license. This action fails for regular users when they start MATLAB from the network share. However, if they copy the installation directory to a local disk everything works fine. Running MATLAB as an admin user from the network share also works. Same story with PuTTY. If the executable is launched from the share, regular users cannot connect to any servers. Something is blocking network communications for programs that are launched from a network drive. Here's the only other mention I could find of the same problem: https://social.technet.microsoft.com/Forums/en-US/w7itpronetworking/thread/4504b192-0bc0-4402-8e00-a936ea7e6dff It's not the Windows firewall or the IE security settings. Does anyone have any clue as to what this is?

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  • What's the normal way machine-learning algorithms are integrated into normal programs?

    - by Benjamin Pollack
    I'm currently taking a machine learning course for fun, and the course heavily focuses on Matlab/Octave to write the code. One thing mentioned in the course is that, while Matlab/Octave are great for prototyping, they're very rarely used for production algorithms. Instead, those algorithms are typically rewritten in C++/Python/etc., using appropriate libraries, before reaching customers. Fair enough; I get that. But here's my question: is that done for cultural reasons, for technical reasons, or because there is really no language that provides Matlab/Octave-like fluidity, but in a compiled form that can be linked from C/C++/$MainstreamLanguage? The game industry uses Lua for game logic because it's easy to embed, and vastly superior for expressing things like AI. Likewise, there are Prolog variants for rules-heavy applications, Scheme variants for compilers, and so on. If there's a matrix equivalent language, what is it? If there isn't, why is this field different?

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  • Accurate least-squares fit algorithm needed

    - by ggkmath
    I've experimented with the two ways of implementing a least-squares fit (LSF) algorithm shown here. The first code is simply the textbook approach, as described by Wolfram's page on LSF. The second code re-arranges the equation to minimize machine errors. Both codes produce similar results for my data. I compared these results with Matlab's p=polyfit(x,y,1) function, using correlation coefficients to measure the "goodness" of fit and compare each of the 3 routines. I observed that while all 3 methods produced good results, at least for my data, Matlab's routine had the best fit (the other 2 routines had similar results to each other). Matlab's p=polyfit(x,y,1) function uses a Vandermonde matrix, V (n x 2 matrix) and QR factorization to solve the least-squares problem. In Matlab code, it looks like: V = [x1,1; x2,1; x3,1; ... xn,1] % this line is pseudo-code [Q,R] = qr(V,0); p = R\(Q'*y); % performs same as p = V\y I'm not a mathematician, so I don't understand why it would be more accurate. Although the difference is slight, in my case I need to obtain the slope from the LSF and multiply it by a large number, so any improvement in accuracy shows up in my results. For reasons I can't get into, I cannot use Matlab's routine in my work. So, I'm wondering if anyone has a more accurate equation-based approach recommendation I could use that is an improvement over the above two approaches, in terms of rounding errors/machine accuracy/etc. Any comments appreciated! thanks in advance.

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  • Need help fixing a strange path error in bash

    - by Evan
    UPDATE Ok, I found some errors in the path which I think I fixed, but now it's not running in any case - which for some reason I think is a step forward. Thanks for suggesting the following steps, here is their output: user@computer:~$ echo $PATH /usr/share/fsl/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/usr/local/matlab/bin:/usr/local/VoxBo/bin:/usr/local/itt/idl64/bin:/usr/local/afni/bin/:/usr/local/mricron:/usr/lib/voxbo/bin:/home/user/folder:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11/:/usr/games/:/usr/local/matlab/bin:/usr/local/VoxBo/bin/:/usr/local/itt/idl64/bin:/usr/local/afni/bin/:/usr/local/mricron/ user@computer:~$ typeset -p PATH declare -x PATH="/usr/share/fsl/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/usr/local/matlab/bin:/usr/local/VoxBo/bin:/usr/local/itt/idl64/bin:/usr/local/afni/bin/:/usr/local/mricron:/usr/lib/voxbo/bin:/home/user/folder:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11/:/usr/games/:/usr/local/matlab/bin:/usr/local/VoxBo/bin/:/usr/local/itt/idl64/bin:/usr/local/afni/bin/:/usr/local/mricron/" user@computer:~$ type app1 app1 is /home/user/folder/app1 user@computer:~$ type app2 app2 is /home/user/folder/app2 user@computer:~$ app1 bash: /home/user/folder/app1: No such file or directory user@computer:~$ app2 bash: /home/user/folder/app2: No such file or directory user@computer:~$ /home/user/folder/app1 bash: /home/user/folder/app1: No such file or directory user@computer:~$ /home/user/folder/app2 bash: /home/user/folder/app2: No such file or directory user@computer:~$ cd /home/user/folder user@computer:~/folder$ app1 bash: /home/user/folder/app1: No such file or directory user@computer:~/folder$ ./app1 bash: ./app1: No such file or directory user@computer:~/folder$ ./app2 bash: ./app2: No such file or directory user@computer:~/folder$ ls -l total 29384 -rwxr-xr-x 1 user user 14949776 2011-02-03 11:09 app1 -rwxr-xr-x 1 user user 15137300 2011-02-03 11:10 app2 user@computer:~/folder$ Thanks for everyone's input! ORIGINAL QUESTION I have two executable files I downloaded and am trying to add to the path. They are located in /home/user/folder and the specific files are /home/user/folder/app1 /home/user/folder/app2 Both app1 and app2 have the executable flag set to all (user, group, other). I can execute the files if I am in /home/user/folder and I execute these commands ./app1 ./app2 However I can't run them from elsewhere. I added this line to my .profile PATH="$PATH:/home/user/folder" and then sourced the path with . /home/user/.profile and I can see app1 and app2 when I use command completion (pressing tab). However here is what happens when I try to run app1 or app2 with the following commands (the following only shows 'app1' but the same is true of 'app2') user@comp:~$ app1 -bash: app1: command not found user@comp:~$ /home/user/folder/app1 -bash: app1: command not found user@comp:~/folder$ ./app1 (program runs) I'm stumped :), I must have missed something simple. Thanks for your help!!

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