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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 ...

mehr als ein Jahr vor | 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...

mehr als ein Jahr vor | 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...

mehr als ein Jahr vor | 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,...

mehr als ein Jahr vor | 0

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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...

mehr als ein Jahr vor | 0

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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(...

mehr als ein Jahr vor | 2

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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 ...

fast 2 Jahre vor | 2

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How is this even logical?
When assigning into rows or columns via indexing, MATLAB will conform a RHS vector from row or column to row or column if necess...

fast 2 Jahre vor | 0

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Matlab crashes when running a specific Fortan MEX file under MacOS
The MATLAB Fortran API interface needs to be treated as a pass-by-reference interface. That means you need to have the exact typ...

fast 2 Jahre vor | 0

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What does [n==0] means?
Try it out and see: n = 3; N = 3; n == 0 n == N n = randi(4,1,10) - 1 n == 0 n == N Returns logical true/false where val...

fast 2 Jahre vor | 0

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How to update a symmetric matrix?
E.g., M = rand(6)<0.3; M = double(logical(M+M')) % an arbitrary symmetric matrix VarMin= 1; % Lower Bound of Variables...

fast 2 Jahre vor | 0

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Recursive Method returning answers backwards
This is a very convoluted way to program the Euler method. There is no need for recursion here, just use simple loops instead. ...

fast 2 Jahre vor | 1

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How to randomize order of functions
E.g., Using the cell array approach with randperm: function [results] = runTests(testparameters) f = {@test1,@test2,@test3,@te...

fast 2 Jahre vor | 0

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eval() is too slow to numerically evaluate a function with X(t) and Y(t).
Something like this? syms X(t) Y(t) Vfun = [2*X + Y ; cos(X)*X^2 + Y^3 ; 3 + sin(Y)] syms x y vfun = subs(Vfun,[X Y],[x y])...

fast 2 Jahre vor | 0

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I have one column data 57600 points, how can i convert it to 240 by 240 matrix!
x = your column vector result = reshape(x,240,240); or you might need the transpose: result = reshape(x,240,240).';

fast 2 Jahre vor | 0

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I want to calculate pi^2 to 22 decimal places
You can use this excellent FEX submission by John D'Errico: https://www.mathworks.com/matlabcentral/fileexchange/36534-hpf-a-bi...

fast 2 Jahre vor | 2

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How to stop running code once conditions are met?
If your Birthday function is supposed to represent only one trial (a reasonable thing to do), then you should be returning n, no...

fast 2 Jahre vor | 0

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How to fix the must be a column vector error?
You should double check your derivative function. Shouldn't the result be a 4-element column vector that is a function of q? Ne...

fast 2 Jahre vor | 0

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How to compare elements of two vectors in MATLAB ?
Compare for what purpose? E.g., these statements will compare them: isequal(v1,v2) % are they equal v1 == v2 % matrix of indi...

fast 2 Jahre vor | 0

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Problem with time steps in Runge-Kutte method
"... I get different results with different time steps ..." In general, that is the expected result. I suppose the real questi...

fast 2 Jahre vor | 1

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angle2dcm: How to reference direction cosine matrix output?
Does this do what you want: x = zeros(1,m); % reorder these to row vectors y = zeros(1,m); z = zeros(1,m); : xyz = [x;y;z];...

fast 2 Jahre vor | 0

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Beantwortet
Motion equation of a space engin in low earth orbit
As Bjorn has pointed out, your J2 terms are all the same but they should be different because the equatorial bulge affects the z...

fast 2 Jahre vor | 1

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Problem using 4th order Runge-Kutta method
You have a factor of 2*K4 that shouldn't be there. It should just be K4. E.g., Fx = @(t,x,vx,y,vy,z,vz) [vx; 3*t; vy; t; vz; 7*...

fast 2 Jahre vor | 0

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How can I find angle between two vectors in 3D ranging from 0 to 360 or -180 to +180?
https://www.mathworks.com/matlabcentral/answers/501449-angle-betwen-two-3d-vectors-in-the-range-0-360-degree

fast 2 Jahre vor | 0

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Add another column to the right end of this array
your_matrix(:,end+1) = 1.5;

fast 2 Jahre vor | 0

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Convert Number Character array to Number Integer array/matrix?
Numeric types typically do not get displayed with leading 0's. The numbers you show are converted correctly, they just don't pr...

fast 2 Jahre vor | 0

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Use strcpy with mxArrayToString ?
char* inputStr2 = strcpy(inputStr2, inputStr); % Not working and causing matlab to crash This line crashes because inputStr2 is...

fast 2 Jahre vor | 1

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How to find the number of non-NaN elements in a column that are NaN in the last column, in MatLab?
Code is written from a slightly reordered wording: "for each column, number of elements that are NaN in the last column and non...

etwa 2 Jahre vor | 0

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How to call function repeatedly using arrays as variables?
There are other ways do to this, but to answer your question about how to turn the code into a loop, use indexing based on the n...

mehr als 2 Jahre vor | 1

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Best Practice: Many Functions relying on Global Variables?
See this link for a related discussion involving the best way to define global constants, in particular Steven Lord's answer: h...

mehr als 2 Jahre vor | 1

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