Answered
Unusal error "Current use of the variable is inconsistent with its previous use or definition".
See how the +b is purple? That means MATLAB thinks you are invoking a as a function with +b as a character string input. Hence ...

7 months ago | 1

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Question


Incorrect datetime UTCLeapSeconds conversion
I am working with leap second data, and as part of the calculations I did this for a particular leap second: dt1 = datetime(197...

7 months ago | 1 answer | 0

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Answered
How to add rows containing zeros to a matrix
E.g., one way using the end syntax: my_matrix = reshape(1:12,3,4) n = 4; % number of rows to append my_matrix(end+n,1) = 0 B...

7 months ago | 0

Answered
error using tranpose (recieving permute error )
If you are trying to transpose the initial 2D pages of your variable, you can do this: pagetranspose(featvales) Or this: d = ...

7 months ago | 0

Answered
Error L2 is not defined
You have a fundamental problem with your code. You have a 2nd order ODE, which means there will be two states you need to carry ...

7 months ago | 0

Answered
Use Indexing for more than 1 dimension of array simultaneously
Yet another way using linear indexing (showing what sub2ind( ) does internally): matrix = rand(10, 3); idx = [1; 2; 2; 3; 1; 2...

7 months ago | 0

Answered
Indexing and turning into column vector
Not really. It's going to be a two-step process no matter how you do it (without resorting to a mex routine, which isn't worth i...

8 months ago | 0

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Answered
how to make a single array out of 2 arrays
Just use indexing. E.g., odd=[0.4357, 0.78208,0.6245] even=[0.48004,1.29188,1.54668,0.82376] both(1:2:5) = odd both(2:2:8) =...

8 months ago | 0

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Answered
Difference between 2 orientations
I would do your method #3 involving quaternions. This would give you the "smallest" rotation between the two attitudes. But you ...

8 months ago | 2

Answered
Implicit casting overhead from real to complex when multiplying two matrices
This is not a natively supported operation (to use your terms). Yes, the real matrix must be first upconverted to a complex matr...

8 months ago | 1

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why do we initialize any vector or matrices with zero.
If you know you will be filling in the variable elements downstream anyway, it would be faster to just allocate the memory and n...

8 months ago | 0

Answered
Complex matrix multiplication with pagemtimes
This really has nothing to do with the maturity of MATLAB ... every language that uses BLAS routines in the background will have...

8 months ago | 2

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Answered
Matrix power vs for loop
Note that the A^endtime method is probably going to be more accurate as endtime gets larger. The loop method can have a tendancy...

8 months ago | 0

Answered
error: matrix dimensions must agree
I would presume you may need element-wise operators. Try this: func = @(K_a,freq)(-K_a./(tan(2*pi*freq*h.*(1 + 0.19./((K_a/60 +...

9 months ago | 0

Answered
Average every 3 rows of 1 column in a 12 x 8 array
E.g., Data = [ 34 6 4 -6.60874766440390 -40.7725049965035 16217 0.289000000000000 1.02200000000000 35 6 5 -6.54326464...

9 months ago | 0

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Answered
Converting 2D cell array to 3D matrix
E.g., MyCell = repmat({(1:4)'},2,3) % small sample data [m,n] = size(MyCell); reshape(cell2mat(MyCell(:)').',m,n,[]) size(an...

9 months ago | 1

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Answered
How can I calculate the "Median" of floating point numbers
E.g., x = randi(10,2,3) y = randi(10,2,3) z = randi(10,2,3) xyz = cat(3,x,y,z) result = median(xyz,3)

9 months ago | 0

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Answered
transposing 3d matrix with permute function
MATLAB does not store trailing singleton (1) dimensions beyond the 2nd dimension. Once you permute that 1 into the 3rd dimension...

9 months ago | 2

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Scalar structure required for this assignment.
This? [Sis.On] = D_{:,2};

9 months ago | 0

Question


LU decomposition algorithm change
For this particular example: A=[ 1 2 3; 4 5 6; 7 8 9; 10 11 12]; I get two different results depending on...

9 months ago | 2 answers | 0

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Answered
Inserting a double to a cell
E.g., x = randi(100,10,10) % sample data columns = [4,7]; % columns to check minx = min(x(:,columns)) % minimum of the two co...

9 months ago | 0

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Answered
Using Matlab to solve 1D Schrödinger Equation (Strange Eigenfunctions)
Python: return is misspelled retrun The mL2V( ) function returns 1000*(y-1/2)**2 I don't see where y is defined prior to the ...

9 months ago | 0

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1×0 empty double row vector using find
Welcome to the world of floating point arithmetic. For your specific example, they are not equal. E.g., x=[0 0.1 0.2 0.3 0.4 0....

9 months ago | 1

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How to plot the first derivative of solution?
After the ode45( ) call, simply pass your x solution through your derivative function to obtain the xdot values. You can either ...

9 months ago | 0

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optimizing: fastest way to detect if ANY points are within distance N of points?
Here is a naive brute force mex routine you can try out. It makes no attempts at cache optimization or multi-threading, and is p...

10 months ago | 0

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"roots" call is not providing the correct answer
Rename your old roots file (preferred method) or move it to a directory that is not on the MATLAB path. That way it won't shadow...

10 months ago | 1

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How can ı solve this error ??Unable to perform assignment because the size of the left side is 1-by-5 and the size of the right side is 26-by-1.
You could expand the size of the LHS array. E.g., poles_real(i, 1:numel(roots_poly)) = real(roots_poly); poles_imag(i,...

10 months ago | 0

Answered
angle of a vector centered at a certain point
Once you have the vectors, you can calculate the angles between the vectors using the technique I posted here: https://www.math...

10 months ago | 0

Answered
How to expand dimension of a 2D array
All MATLAB trailing singleton (1) dimensions beyond the 2nd dimension are not physically stored, and will not show up in a size(...

10 months ago | 2

Answered
A single precision matrix multiplication problem
Somewhat related side comments: In general, the BLAS/LAPACK libraries do not contain mixed type argument routines. E.g., there ...

10 months ago | 2

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