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• MATLAB: Drawing a line over a black and white image

  - by Richard

  This is quite possibly an extremely retarded question, but what is the best way to draw a line over a black and white (binary) image in MATLAB, provided the start and end coordinates are known? Please note, I am not trying to add an annotation line, I would like the line to become part of the image.

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• How to override the default text in MATLAB

  - by Richie Cotton

  In MATLAB, when you click File - New - Function M-File, you get a file with the following contents: function [ output_args ] = Untitled( input_args ) %UNTITLED Summary of this function goes here % Detailed explanation goes here end Is it possible to override this behaviour, and specify your own text? (The motivation is that I'm trying to…

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• Plotting in Matlab

  - by papaduke

  How do you plot two figures at the same time in Matlab? Every time I use surf() it plots over the old one. Also, how do you save the images so you can export them to MS word or powerpoint or something?

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• Changing scaling of MATLAB Figure

  - by Phil

  I have a figure that displays 20,000 points on the x-axis. So it labels the x-axis from 0 ... 20,000. However, now I would like to scale it from 0 to 50. But when I try to do this in the plot window it just shows me the first 50 points, instead of changing the scale. Is there any straightforward way to do that in MATLAB?

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• How to terminate a running process in matlab ?

  - by ZaZu

  Hi there, I have a pretty simple question, how can I terminate a running script in matlab using a code ? Similar to using CTRL + C I want the program to stop running if a user enters incorrect digits Any ideas ? Thanks

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• Specifying a callback in Matlab after any runtime error

  - by JmG

  Is there a way to specify code to be run whenever an error occurs in Matlab? Googling I came across RunTimeErrorFcn and daqcallback, but I believe these are specific to the Data Acquisition Toolbox. I want something for when I just trip over a bug, like an access to an unassigned variable. (I use a library called PsychToolbox that takes over…

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• image processing with matlab

  - by wamp

  It's from this thread but I'm also interested in this. How to I filter out pixels not in green channel? And how to I select a point which is inside a closed box with MATLAB?

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• Automatic selection of control points in Matlab

  - by Veronica

  Hello, Is there a way to select the control points automatically in Matlab instead of manually selecting them by cpselect? Thank you very much.

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• Calculating the maximum distance between elements of vector in Matlab

  - by lhahne

  Lets assume that we have a vector like x = -1:0.05:1; ids = randperm(length(x)); x = x(ids(1:20)); I would like to calculate the maximum distance between the elements of x in some idiomatic way. It would be easy to just iterate over all possible combinations of x's elements but I feel like there could be a way to do it with Matlab's built-in…

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• How can I list global variables in MATLAB?

  - by Sanjay Manohar

  How can I see a list of what global variables are defined in MATLAB? (I am using R2009a). I have hunted unfruitfully for this on Google and SO, so apologies if it has been asked before.

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• Is there a substitute for blockproc in Matlab?

  - by SetchSen

  I've been using blockproc for processing images blockwise. Unfortunately, blockproc is part of the Image Processing Toolbox, which I don't have on my personal computer. Is there a combination of functions in base Matlab that can substitute for blockproc? My initial guess was to use im2col to transform each block into columns, and then…

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• MATLAB: how to compute mean average precision

  - by Patrick

  hi, I need to evaluate information retrieval results using Mean Average Precision. What's the function in Matlab for doing that ? thanks

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• MATLAB plot moving data points in seperate subplots simutaneously

  - by Nate B.

  I wish to visualize the movement of a data point throughout space across a period of time within MATLAB. However, the way I want my figure to display is such that only a single instant is plotted at any given time. That was easy, I simply created a for loop to update my 3D plot display for every set of coordinates (x,y,z) in my data.…

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• Plotting 'Hi' in MATLAB

  - by Arkapravo

  Hi Guys Wanted to plot this 'Hi', which may be 'Hello World' graphical equivalent in MATLAB. Haven't been able to do it. Any suggestions is welcome.

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• 3D plotting in Matlab

  - by Jill

  I'm using the subplot and then surf functions to generate images in 3D in Matlab. How do I get rid of the axes and axis' gridlines and change the color to all yellow or all green or something like that? Thanks.

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• matlab plot and line

  - by Tim

  What's the difference between function plot and line in matlab? Are they doing the same thing? Thanks!

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• How to implemnt benfords law in matlab

  - by jameslocke

  I want to implement a version of Benfords law (http://en.wikipedia.org/wiki/Benford%27s_law) that basically asks for the first digit of a number to do analysis on the distribution. 1934---> 1 0.04 ---> 4 -56 ---> 5 How do you do this in MATLAB?

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• Color Comparison of two images using matlab

  - by user265536

  Is it possible to compare the color of two images using Matlab if the two images are of different sizes?The problem that am facing is that, i want to detect the presence of a colored patch in an image?

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• matlab get color

  - by iteratorr

  I am using matlab for cluster visualization. I want to somehow get the color of my current cluster center fill in the plot and draw line of same color to cluster members. How can I get the color?

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• Plotting Bessel function in MatLab

  - by 4alala

  In MatLab how do you plot f(r) = { 2*J1(a*r) / r }^2 where a = 2*pi and J1 is Bessel function of the 1st kind and r = sqrt(x^2 + y^2) This should plot in 3D, i.e. kind of be like a bubble (not sure how to do this)

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• Matlab code works with one version but not the other

  - by user1325655

  I have a code that works in Matlab version R2010a but shows errors in matlab R2008a. I am trying to implement a self organizing fuzzy neural network with extended kalman filter. I have the code running but it only works in matlab version R2010a. It doesn't work with other versions. Any help? Code attach function [ c, sigma , W_output…

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• MATLAB : frequency distribution

  - by Arkapravo

  I have raw observations of 500 numeric values (ranging from 1 to 25000) in a text file, I wish to make a frequency distribution in MATLAB. I did try the histogram (hist), however I would prefer a frequency distribution curve than blocks and bars. Any help is appreciated !

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• MATLAB query about for loop, reading in data and plotting

  - by mp7

  Hi there, I am a complete novice at using matlab and am trying to work out if there is a way of optimising my code. Essentially I have data from model outputs and I need to plot them using matlab. In addition I have reference data (with 95% confidence intervals) which I plot on the same graph to get a visual idea on how close the…

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• Working with a figure file in Matlab

  - by 49er

  I've got a .fig file showing the intensities of 2d data. How do I obtain the values when I load it in Matlab? Is it even possible? When I try playing with the children properties I am able to obtain only the size of my x and y vectors, not the values themselves which I don't know how to extract.

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• compilation of image stitching code in matlab

  - by chee

  i am facing lots of problems while running code for image stitching given at this link http://se.cs.ait.ac.th/cvwiki/matlab:tutorial:image_stitching_from_high-view_images_using_homography may i get help regarding this type of problems here. EDIT: Image stitching code fails with the following message: ??? Undefined…

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