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Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

11年以上前

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Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

11年以上前

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Who Has the Most Change?
You have a matrix for which each row is a person and the columns represent the number of quarters, nickels, dimes, and pennies t...

11年以上前

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Most nonzero elements in row
Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...

11年以上前

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Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...

11年以上前

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Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

11年以上前

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how to count the no of words in a sentence?
txt = fileread('hello.txt'); %read in file, assuming it is not too big sentences = strtrim(regexp(txt, '[\.\?\!]+', 'split...

11年以上前 | 0

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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...

11年以上前 | 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));

11年以上前 | 0

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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...

11年以上前 | 0

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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'), ...

11年以上前 | 0

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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...

11年以上前 | 6

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

11年以上前 | 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 ...

11年以上前 | 0

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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...

11年以上前 | 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)

11年以上前 | 2

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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); ...

11年以上前 | 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...

11年以上前 | 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 ...

11年以上前 | 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 ...

11年以上前 | 0

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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...

11年以上前 | 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...

11年以上前 | 1

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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-...

11年以上前 | 0

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

11年以上前 | 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...

11年以上前 | 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...

11年以上前 | 1

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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 ...

11年以上前 | 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. ...

11年以上前 | 0

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

11年以上前 | 0

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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...

11年以上前 | 0