Answered
Find minimum difference between matrices.
Another way using histc() function (may be faster for large matrices). A = rand(5,5); %first matrix B = rand(2,3); %s...

12 years ago | 1

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How to repeat rows of matrix?
One way: f = @(k) repmat(M(k,:), round(V(k)), 1); MM = cell2mat(arrayfun(f, (1:length(V))', 'UniformOutput', false));

12 years ago | 0

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Answered
Size of data points in random scatter image
This is actually a relatively straightforward process. Steps: 1. Threshold image to convert to black and white. im2bw() fu...

12 years ago | 0

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Answered
Comparing Vector Elements (of 2 vectors)
I think this should do what you want: Rc = mat2cell(R, 1, ones(size(R))); comp = cellfun(@(x) find(P<x,1,'last'), ...

12 years ago | 0

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Answered
Find consecutive values in a vector that are above a threshold
One way: s = RandStream('mcg16807','Seed',0); RandStream.setDefaultStream(s); %set seed so example is reproducible m...

12 years ago | 6

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Answered
How to divide an arc?
If I understand your question correctly, John D'Errico's interparc ( <http://www.mathworks.com/matlabcentral/fileexchange/34874-...

12 years ago | 1

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Extract Variable from Filename?
You can use strtok() or other methods, but I prefer regexp here: filename = 'sitename.yr.synth.daily.mat' %example ...

12 years ago | 0

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Answered
Matlab code for system of differential equations (chemical kinetics) fitting to data
To be clear, you want to fit experimental data to a system of differential equations with some number of unknown parameters, cor...

12 years ago | 4

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I have matrix A, how can I add a row in matrix A with others rows of matrix A ?
b = sum(a(:,1:10:91),2)

12 years ago | 2

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Answered
thermal images processing || Need help! :)
Here's an example of an approach that might work: X= imread('coins.png'); %sample indexed image BW = (X > 100); ...

12 years ago | 1

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convert Vector into matrix ?
It might not be very efficient, but I think it should work: nc = 3; %number of columns in B nc = nc-1; c = 1:(length...

12 years ago | 0

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Improve Ellipse Fit around a Binary Image
To build on Image Analyst's point, you can do something like this. outline = bwmorph( isolatedBean, 'skel'); %convert ...

12 years ago | 0

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How to resample a signal by a fraction
You could use interpolation instead. Something like this: vnew = interp1( t, v, t/(1+a), 'linear'); You could use other ...

12 years ago | 0

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Answered
Filling gaps in time series with Nan
One way that considers floating point errors: startValue = datenum(2013,5,17,0,0,0); %your starting observation endVa...

12 years ago | 1

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How do I get regexp to read specific values in a text file?
This seems to work for me: pattern = 'Platform:\s+(\d+)'; data = regexp(indata, pattern, 'tokens'); data = cell2mat...

12 years ago | 1

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Answered
how to find indices on a boundary?
You can use the inpoly() function on the file exchange ( <http://www.mathworks.com/matlabcentral/fileexchange/10391-fast-points-...

12 years ago | 0

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I need help (palindrome vector)
y = x([1:end, end-1:-1:1])

12 years ago | 1

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Extract non-zero elements from matrix with double precision numbers
notZeros= M(M~=0); Keep in mind that due to numerical precision, some of your matrix elements may be small but not identica...

12 years ago | 0

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index of a sequence
You don't really need the loops: a=[50 150 80 200 30]; b=[60 50 150 70 200]; [d,rows]= min([a;b], [], 1); %get l...

12 years ago | 1

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Answered
How to a partition a data set of days into weekdays and weekends
Hi Torrey, I think this should do it: %Matrix is your 365x48 matrix %Every 4th and 5th rows are Saturday and Sunday ...

12 years ago | 0

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Script Writes Correctly, The Graph Still Doesn't Show Up
Call hold on after your silhouette() call. 'hold on' prevents the current axes from being cleared after each plotting command. ...

12 years ago | 0

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Answered
replacing components of a matrix
%your matrix is M isBetween = (M >= 2.9) & (M <= 3.2); M(isBetween) = -1

12 years ago | 0

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Answered
how to calculate the area under a plot? when I use the area option, I'm not getting a satisfactory value. someone pls help me.
This isn't what the area() function does. The area function plots a filled shape below the line that is passed into it. The grap...

12 years ago | 0

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How do I get both the minimum of a 2D matrix and it's indices?
minMatrix = min(matrix(:)); [row,col] = find(matrix==minMatrix);

12 years ago | 18

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How to open .dat file
Use the functional form of load, i.e. load(f)

12 years ago | 0

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Answered
How can shape a matrix with predefined vectors?
N = [N1; N2; N3];

12 years ago | 1

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Answered
XTick Visibility off with XTickLabel showing
set(axes2, 'TickLength', [0 0]);

12 years ago | 1

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Answered
How to avoid for loops when generating index arrays?
It's kind of hack-y, but it gives the same output as your original posting: n=4; l = cell2mat(arrayfun(@(x) x*ones...

12 years ago | 0

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How can I plot 3D TENT with MATLAB?
For part (a), I would look up the documentation for the following two commands: linspace %to create your x and y domain ve...

12 years ago | 0

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Loading ascii data file with headers
This should do it fid = fopen('path/to/your/file.txt', 'rt'); Data = textscan(fid, '%d %f %f', 'headerLines', 3, 'Collec...

12 years ago | 0

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