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How to calculate Sums in a Panel Data framework using "For Loops"
To get the moving sum of the previous 12 elements, and marking all windows NaN where you don't have 11 previous points, you can ...

9年以上前 | 0

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Convolution of many vectors
You can use a fun trick here. Each of these polynomials is a quadratic, so you can find their roots easily enough: F = F(:...

9年以上前 | 0

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How to exclude the center/current number when performing movmax?
There's no direct way to exclude the current point in a given window with the moving statistics functions. However, since you w...

9年以上前 | 2

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Help on calculating cumulative moving average
If you're trying to do a cumulative moving mean, where each time you move to the next element it is the mean of that element and...

9年以上前 | 2

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mean value of a group of data with NaNs
You can also just use the 'omitnan' option in "mean": A = [1 0 0 1 NaN 1 NaN 0]; M = mean(A,'omitnan') M = 0.5...

約10年前 | 2

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How to convert the mean value of an integer matrix to a double
Are regionA and regionB allocated as integers? It seems likely he final assignment that is casting them back to integers. Sinc...

約10年前 | 0

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How to limit rounding in matrix division
Your last sentence has the answer: your data type is uint8. Dividing a uint8 by a uint8 is going to give you another integer, s...

10年以上前 | 0

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How to interpolate for given inputs in a n*m matrix
If I understand your question correctly, it sounds like <http://www.mathworks.com/help/matlab/ref/griddedinterpolant-class.html ...

10年以上前 | 0

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Why is MATLAB crashing on medium-to-large matrices?
Does it create a crash log? If so, what's in the log? You can find it using the directions located here: <http://www.mathwo...

10年以上前 | 0

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How to realzie iczt use Matlab?
There's not necessarily going to be a straightforward inverse for the Chirp-Z transform unless its parameters define evenly spac...

10年以上前 | 1

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How do I reduce this nxmx3 matrix to a (n*m)x3 matrix?
It sounds like you want a combination of <http://www.mathworks.com/help/matlab/ref/permute.html permute> and <http://www.mathwor...

10年以上前 | 0

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Combine datasets of unequal lengths by matching dates
There's a little bit of ambiguity here, but this shouldn't be too hard. What happens when there is no corresponding date from V...

10年以上前 | 0

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Does anyone know how to allocate a vector with datetime elements?
<http://www.mathworks.com/matlabcentral/newsreader/view_thread/338369 This question has appeared before>, but there are two opti...

10年以上前 | 10

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Generate 'k' vectors of unique (non-repetitive) integer random variables in the same range
Will, given that you want integers in the range [-50 50] and are trying to generate 1000 numbers for both A and B, you're not go...

10年以上前 | 1

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what is the initial phase of the signal y=sin(2*pi*x)? zero or -π？
When taking the FFT of an input array, the first value in the resulting output is the <https://en.wikipedia.org/wiki/DC_bias DC ...

11年弱前 | 2

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I have large number of precipitation daily data in a column (for 50 years) for 221 meteorological stations. Now I need to convert it to monthly sum. How can I do that? thanks.
Things like leap days make this a bit tricky, so here are some general steps you might consider: # Create a <http://www.mathw...

11年弱前 | 0

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Valid part of frequency convolution
To answer your question, it's important to note what _type_ of convolution you're doing. If you have two inputs of length N, fo...

11年弱前 | 0

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Deconvolution of Gaussian from Polynomial Function: Axis-symmetry and Vector-Length-Dependence
To answer your first question, the first input to conv on line 33 is not symmetric; this is why your output is not symmetric. ...

11年弱前 | 1

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about FFT and wave packet
You are using different scaling factors for the two expressions; the FFT version is scaled with dx = 0.1963 and the "analytical ...

11年弱前 | 0

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I can't submit support tickets
How have you tried creating the support request? There are several ways you can contact the technical support team: Through the...

11年弱前 | 1

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How can I resize the horizontal lineLength in Legend?
When I try this in R2014a, two objects are returned into |textobj|, and the first seems to correspond to the line that is drawn ...

11年以上前 | 0

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Obtaining fundamental frequency of complex signal from Fourier transform
I think the answer depends on what you mean by "looking directly at the magnitude spectrum of the Fourier transform." If what y...

11年以上前 | 2

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imshow error with Matlab 2014a. ... Error using Settings Undefined function or variable 'matlab.internal.getSettingsRoot'. Error in iptgetpref (line 22) s = Settings; Error in imshow (line 234) initial_mag =
This might be a path problem. Try the <http://www.mathworks.com/help/matlab/ref/restoredefaultpath.html |restoredefaultpath|> a...

12年弱前 | 2

12年弱前 | 0

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How I can use the eig function for nonsymmetric matrices?
The |eig| function does not require any additional options for nonsymmetric matrices. There is an <http://www.mathworks.com/hel...

12年弱前 | 0

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Image analysis on multiple images
You can place the code you are running inside of a function that you write that takes as input the filename of the image that yo...

12年弱前 | 1

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How to construct a binary matrix reporting 1 in case of equal rows of two arrays of different dimensions?
One way to do this without looping would be to exploit the property that two vectors |w| and |v| are equal if and only if ...

12年弱前 | 1

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maximum variable size allowed by the program is exceeded
Without having access to the TIF file that this code is loading, it is difficult to say for sure, but it seems as if the error i...

12年弱前 | 0

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How to plot data in an irregular/non orthogonal grid?
The |mesh| and |surf| functions can take irregularly spaced vector and matrix inputs that define the mesh. However, their input...

12年弱前 | 0

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sparse( ix, jx, sx, rx, cx ) implausibly slow
Using 5 input arguments with the |sparse| command is indeed an efficient way to construct a sparse matrix. However, you most li...

12年弱前 | 1

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