I tried to update some part of a matrix, I got the following error message: ??? Assignment has fewer non-singleton rhs dimensions than non-singleton subscripts My code tries to update some values of a matrix that represent a binary image. My code is as follows: outImage(3:5,2:4,1) = max(imBinary(3:5,2:4,1)); When I delete last parame...
I would use a multi dimensional gaussian modell for regression. Rasmussen has a book with an algoritm, but it is only for one dimension output. Any idea to modify it? ...
I'm running a long simulation in MATLAB that I've realized I need to stop and rerun. However, MATLAB is really into this calculation, and it's stopped responding. How can I interrupt this run without killing MATLAB? (I realize this is a problem with many Windows programs, but it's really acute with MATLAB.) ...
Here is the desired workflow: I want to load 100 images into MATLAB workspace Run a bunch of my code on the images Save my output (the output returned by my code is an integer array) in a new array By the end I should have a data structure storing the output of the code for images 1-100. How would I go about doing that? ...
I am considering moving from Matlab to Python/numpy for data analysis and numerical simulations. I have used Matlab (and SML-NJ) for years, and am very comfortable in the functional environment without side effects (barring I/O), but am a little reluctant about the side effects in Python. Can people share their favorite gotchas regarding...
using MATLAB, we have converted image into audio (.wav format). Also this audio file is converted into spectrogram image. Now we are trying to convert this spectrogram into an original input image ...
I'm writing a sizable application using object-oriented MATLAB, and this has gotten me thinking about how to document the code. If this was C, I would use Doxygen. For Java, I'd use JavaDoc. Both have mostly agreed-upon standards for how class and method documentation should look and what it should contain. But what about MATLAB code? T...
I have trained xor neural network in Matlab and got these weights: iw: [-2.162 2.1706; 2.1565 -2.1688] lw: [-3.9174 -3.9183] b{1} [2.001; 2.0033] b{2} [3.8093] Just from curiosity I have tried to write MATLAB code which computes the output of this network (2 neurons in hidden layer, and 1 in output, TANSIG activation function). C...
I know Matlab has a function called cylinder to create the points for a cylinder when number of points along the circumference, and the radius length. What if I don't want a unit cylinder, and also don't want it to center at the default axis (for example along z-axis)? What would be the easiest approach to create such a cylinder? Thanks ...
link text Based on the link above, I managed to get the cross point but sometimes I get 2 or more results. I have 10 similar images with the cross slightly moved in every frame. Is there a way that I can remove the extra pixels remaining that are very off from the other 9 images by comparing it to the cross point of the 1st image? As th...
My seven-years old expresses large interest in computers (well, who doesn't? :). Since I'm mostly program in MATLAB, I'm thinking why not to teach him MATLAB. We did a small project with him (he had to solve as many simple arithmetic problems as possible in a limited time) and he get pretty excited. I coded, he watched and then tested. H...
I am trying to create a matrix that is 3 x n, with each of the columns being the same. What's the easiest way of achieving it? Concatenation? ...
I have three 1-d arrays where elements are some values and I want to compare every element in one array to all elements in other two. For example: a=[2,4,6,8,12] b=[1,3,5,9,10] c=[3,5,8,11,15] I want to know if there are same values in different arrays (in this case there are 3,5,8) ...
I'm working on a verification-tool for some VHDL-Code in MATLAB/Octave. Therefore I need data types which generate "real" overflows: intmax('int32') + 1 ans = -2147483648 Later on, it would be helpful if I can define the bit width of a variable, but that is not so important right now. When I build a C-like example, where a variable g...
I generate a figure in MATLAB with large amount of elements (100000+) and want to save it into a PDF file. With zbuffer or painters renderer I've got very large and slowly opened file (over 4 Mb) - all points are in vector format. Using OpenGL renderer rasterize the figure in PDF, ok for the plot, but not good for text labels. The file s...
I am generating an Excel file through MATLAB and I have empty cells in the middle of it. Here is the code I am using to initialize an empty matrix: newfile = cell(5,5); [newfile{:}] = deal(''); [newfile{:}] = deal(' '); I then do some processing and write the data to a file using XLSWRITE. The spreadsheet ends up having some empty cel...
Below is my code in Matlab I am having trouble with the line sum = (h/2) * (f(a) + f(b)) + h; Matlab says I have to many outputs when I try to call the f(x) function. Is my problem with the f(x) function function Trapezoid_Uniform(a,b,n) h = (b - a)/n; sum = (h/2) * (f(a) + f(b)) + h; for i = 1:n-1 x = a + i*h; ...
I want to make a 2D array dij(i and j are subscripts). I want to be able to do dij = di,j-1+(di,j-1 - di-1,dj-1)/(4^j-1) My idea for this it to make to 1D arrays and then combine them into a 2D array. Is there an easier way to do this? ...
I am trying to export a list of text strings from Python to MATLAB using scipy.io. I would like to use scipy.io because my desired .mat file should include both numerical matrices (which I learned to do here) and text cell arrays. I tried: import scipy.io my_list = ['abc', 'def', 'ghi'] scipy.io.savemat('test.mat', mdict={'my_list': my...
Hi, I have a 2D array, call it 'A'. I have two other 2D arrays, call them 'ix' and 'iy'. I would like to create an output array whose elements are the elements of A at the index pairs provided by x_idx and y_idx. I can do this with a loop as follows: for i=1:nx for j=1:ny output(i,j) = A(ix(i,j),iy(i,j)); end end H...