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Loop / Repeat if random number = 0
Try n = round(200*rand); while (n == 0) n = round(200*rand); end Or, even better, n = randi(200); % gene...

12 years 前 | 1

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How can i calculate e^A*t
Use the expm function for computing a matrix exponential

12 years 前 | 10

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Deleting similar rows in Matrices contained in cell
If I understand your objective, try the following arrayOfElements = ['a','b','c','d']; % your initial array indicesOfUni...

12 years 前 | 0

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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 ...

12 years 前 | 14

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

12 years 前 | 1

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

12 years 前 | 0

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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...

12 years 前 | 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.

12 years 前 | 2

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

12 years 前 | 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...

12 years 前 | 0

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

12 years 前 | 0

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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...

12 years 前 | 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...

12 years 前 | 0

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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...

12 years 前 | 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 ...

12 years 前 | 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...

12 years 前 | 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...

12 years 前 | 0

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

12 years 前 | 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...

12 years 前 | 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,...

12 years 前 | 0

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

12 years 前 | 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...

12 years 前 | 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...

12 years 前 | 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, ...

12 years 前 | 0

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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_...

12 years 前 | 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)\...

12 years 前 | 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 ...

12 years 前 | 6

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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...

12 years 前 | 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...

12 years 前 | 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...

12 years 前 | 1