Answered
Masking out Image area using Binary Mask
Let I be the m-by-n image, and let M be the m-by-n mask. The new image, Inew, will be m-by-n and have zeros everywhere there ...

13 years ago | 14

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Answered
Surf z axis not visible
After issuing peaks issue the command zlabel('z')

13 years ago | 1

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RESAMPLING DATA
One way: numData = xlsread('yourExcelFile.xlsx'); % read in data numDataOut = numData(1:15:end); % subsample (get every ...

13 years ago | 0

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Answered
compute the unit vector given the angle
Given the angle theta in radians (counter-clockwise is positive theta, theta = 0 points in the positive x-direction) you...

13 years ago | 0

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I am writing code for a function but I get an error message
Just replace && with & and double pipes | | with | to operate on nonscalars.

13 years ago | 2

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Answered
merge number and character
If x = 3; y = '-'; merge with [num2str(x),y]

13 years ago | 1

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dividing a matrix into equal submatrices
I assume that your vector, x, is n-by-1 where n is divisible by 10. Try xIntoTenPieces = reshape(x,[],10); which p...

13 years ago | 0

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Answered
Problem with the mean function
Try this meanWithoutNans = mean(refoulement(~isnan(refoulement)));

13 years ago | 0

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Answered
Count number of specific values in matrix
Try this: numberOfNonZeros = nnz(m==4); Using nnz is more efficient than converting logicals to numeric, which is requir...

13 years ago | 18

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Operate on Successive Values Without Loops
Totally... first arrange your vectors as column vectors, then try distance = sum(sqrt((x(1:end-1)-x(2:end)).^2 + (y(1:end-1...

13 years ago | 0

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Answered
Attempt to have a 3D mesh plot of max value of real part of eigenvalues of a matrix. Shows error saying that 'Error showing Horzcat. CAT arguments dimensions are not consistent' even though my matrix is square.
When you create BKm, you use the output k from meshgrid. The output k is a 1001 square matrix that you are effectively trying t...

13 years ago | 0

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still not getting the oop concept... please help
You can get the behavior you want if you subclass the handle class. To do this, 1.) replace the line classdef manlists ...

13 years ago | 1

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matlab trick
I'm assuming the images all have the same extension and that the file format is supported by imread. Also, I'm assuming that th...

13 years ago | 0

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Integral of sin(cos(x))
Ultimately, are you trying to compute a definite integral? If there are limits, you may be able to use Bessel functions to eval...

13 years ago | 0

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Answered
how to click a point in an image
Check out the function ginput doc ginput

13 years ago | 0

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equality operator between matrix and scalar
The value .1 and a(12) differ by only one bit as a result of numerical round-off. You can see this with the commands num2h...

13 years ago | 1

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Assigning time points on X axis
If your sampling frequency is 44.1 kHz, then one millisecond comprises 44.1 time samples. So, if x represents the vector of 18,...

13 years ago | 0

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Answered
Sorting NaN
This will work newA = a; % copy original matrix isANanRow = any(isnan(a),2); % find rows that have a nan in them % mo...

13 years ago | 0

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Transforming uniform variables to normal variables
You know that the histogram shouldn't exactly match a Gaussian... Nevertheless, if you use the command above, you are guaranteed...

13 years ago | 0

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Transforming uniform variables to normal variables
I will assume that your uniform random variables are stored in an array just like the one created with the commands X = ran...

13 years ago | 0

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Using a variable in a matrix then plotting one element of the matrix.
When matlab sees A.*B or A.^B the two arrays A and B need to be the same size. In the expression Z = -M.*Om.^2 + i.*Om.*C + K, ...

13 years ago | 0

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Answered
Recursive relation
First, if y depends on the variable x, it would help if you renamed the coefficients in the power series expansion for y from x_...

13 years ago | 0

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Recursive relation
If I assume a power series solution of the form y(x) = \sum_{k = 0}^\infty\alpha_kx^x, I arrive at the recursion (n+1)\...

13 years ago | 0

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How to reshape a cell array of cell arrays
I assume your 1-by-10 cell is just like the 1-by-10 cell C created with the commands C = cell(1,10); for i = 1:10 ...

13 years ago | 6

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Answered
Quickly converting country names to numbers
I assume your table is a n-by-2 cell array, where the first column contains cells whose contents are the names of each country a...

13 years ago | 1

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MATLAB Matrice Function Question help please?
It's a toeplitz matrix... so use the command toeplitz(0:4) to recreate your example. I'm sure you can extrapolate to t...

13 years ago | 2

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vectorizing nested loops
Sorry, but I don't have a suggestion to vectorize this thing. However, as the following code demonstrates, it looks like you co...

13 years ago | 1

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xlswrite dropping strings
It's hard to tell without more detail on the contents of result.xls_full_data. However, if your strings are nested in a cell in...

13 years ago | 1

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Need to make a 4D plot (3D + Colour)
I take it that the four dimensions are the four different indices you are using to index your signals? If so, why would you trea...

13 years ago | 0

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MATLAB OOP - calling an object method from within another object method
One way is via composition: (see <http://en.wikipedia.org/wiki/Object_composition>) Let your two classes be class A and class...

13 years ago | 0

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