Question

Replacing part of an array with another
How do I replace the diagonal of one 2d array with the diagonal of another? The arrays have the same size.

4 mois il y a | 1 réponse | 0

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Question

Duplicating an entire vector
How do you duplicate an entire vector? For example: A=[1 2 3 4]; How do I get the following? 1 2 3 4 1 2 3 4 1 2 3 4 ...

4 mois il y a | 2 réponses | 0

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Question

Generating the laplacian for a sub-graph that still reflects the connectivity of the overall graph
Generating a sub-graph I think by convention breaks all edges between the sub-graph and the rest of the graph. Is it possible to...

5 mois il y a | 1 réponse | 0

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Question

How do you remove non-integer values from a colorbar?
My image only has integer values, so including the non-integer values in the colorbar is something I'd like to not do.

6 mois il y a | 2 réponses | 0

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Question

How do you remove tick marks (not labels) from a colorbar?
I have a figure plotted with imagesc and the associated colorbar. How do I remove the tick marks from the colorbar?

6 mois il y a | 2 réponses | 0

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Question

How do I make a red and blue colormap?
I can plot a matrix of integers using imagesc. How do I make a discrete colormap (i.e., only for the integers) with a gradient o...

6 mois il y a | 1 réponse | 0

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Question

How do I pad a vector of type double so that there are say 5 elements with zeros after every 3rd element in the original vector?...

7 mois il y a | 1 réponse | 0

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Question

How do I take the average of elements of a vector depending on the values of another vector?
Given two vectors, how do I take the average of values in one vector depending on what the value is in the second vector? For...

7 mois il y a | 2 réponses | 0

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Question

How do I insert one array into another?
I have two arrays with elements of type double. I want to insert the 1st column of array 2 after the 1st column of array 1, the ...

7 mois il y a | 1 réponse | 0

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Question

Cell array to double array?
I have a cell array with each element a vector of type double. How do I convert this to an array of type double?

7 mois il y a | 1 réponse | 0

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Question

Removing the suffix from a variable name
I have many variables all called something like A_YYY where YYY can be any combination of characters and numbers of different le...

8 mois il y a | 1 réponse | 0

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Question

Replacing values in array with values from another array
The values in each row of an array correspond to the values i, j of an upper triangular array. How do I return a vector with ele...

8 mois il y a | 1 réponse | 0

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Question

Replacing elements in a vector
The values of an array match the index of elements in a vector. For example, the value of 5 in array1 below corresponds to whate...

8 mois il y a | 2 réponses | 0

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Question

How do you get all pairs without double counting?
Given, say, 10 numbers, how do you get all possible pairs between the numbers without double counting? Order doesn't matter, so ...

8 mois il y a | 1 réponse | 0

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Question

Geometric mean with logarithmically spaced data?
This is partly a Matlab question, partly conceptual. I generated three vectors with logarithmically spaced numbers using logspac...

8 mois il y a | 1 réponse | 0

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Question

Error when taking the continuous time Fourier transform
I am trying to figure out what the error is associated with taking a Fourier transform. I have a 1D vector A of 130 elements and...

8 mois il y a | 1 réponse | 0

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Question

Documentation for mean function
I have a 200×1 cell array where each element is {130×1 double}. I want the mean for all the first elements in the 200 cells, all...

8 mois il y a | 1 réponse | 0

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Question

Averaging elements for a cell within a cell array
I have a 200×1 cell array where each element is {130×1 double}. How do I take the mean of every element in each cell-within-the...

9 mois il y a | 3 réponses | 0

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Question

Symbolic expression for exponential decay
To calculate an exponential decay with a single constant , , why do you need to multiply the following by a heaviside function a...

9 mois il y a | 1 réponse | 0

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Question

Applying an anti-aliasing filter
I've been trying to understand how to design and implement an anti-aliasing filter. I'm really stuck. I have an analytic functio...

9 mois il y a | 1 réponse | 0

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Question

Using the lowpass function
In using the lowpass function, how can you suppress the display after? (The default implementation outputs plots of the time-dom...

9 mois il y a | 2 réponses | 0

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Question

Anti-aliasing filter design
Can you use the lowpass function as an anti-aliasing filter, or is there some preferrable way to do it such as using the butter ...

10 mois il y a | 2 réponses | 0

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Question

How do you determine the arguments to the `buttord` function?
This is more of a conceptual question -- there are examples on the page for this function, but how do you select what the passba...

10 mois il y a | 1 réponse | 0

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Question

How do you calculate a correlation function in MATLAB?
I am trying to calculate the correlation function given by where I sum over all i ("part" in the following). Do I just choose...

10 mois il y a | 1 réponse | 0

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Question

Error with pinv in MATLAB r2018a
I am taking the pseudoinverse of a matrix using pinv but get the following error: Error using svd SVD did not converge. E...

11 mois il y a | 1 réponse | 0

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Question

How do you build multiple cell arrays from the columns of an array?
Given an m x N array of type double, how do you separate the columns into cells so that you have N, m x 1 cell arrays?

11 mois il y a | 1 réponse | 0

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Question

Using vertcat for cell array of differing length
I have a 3 x 2 cell array consisting of elements that are vectors 1 x N where N changes. How do I find the vector of minimum len...

11 mois il y a | 1 réponse | 0

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Question

How do you average vectors in a cell array?
A cell array of vectors of type double, say: 1 x 10000 1 x 10000 1 x 10000 How do you average the values into one array ...

11 mois il y a | 1 réponse | 0

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Question

What determines the maximum frequency when taking the FFT?
This is part conceptual, part MATLAB, but how do you set the maximum frequency when taking the FFT of a signal? According to the...

11 mois il y a | 2 réponses | 0

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Question

Taking the fft of a signal sampled above the Nyquist rate but getting strange results
I have been trying to reproduce a frequency domain function from a time domain signal, but getting nothing like what I expect. ...

11 mois il y a | 1 réponse | 0

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