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How can I create arrays with different names using loop?
Don't embed numbering into the variable names. This will make the variables hard to use downstream in your code. Use cell arrays...

más de 4 años hace | 0

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How to subtract each column of a matrix from a column vector?
Just do a usual subtraction and let MATLAB implicit expansion kick in: M = your matrix v = your column vector result = v - M;...

más de 4 años hace | 0

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Simple mex file crash?
You need to create the output variable yourself. plhs[0] doesn't exist until you create it, thus this line crashes: outData = m...

más de 4 años hace | 0

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Simulating Projectile with Matlab
You don't show us both methods (with and without drag) so we can't compare them. I presume you simply set k=0 for the case witho...

más de 4 años hace | 1

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Matlab simulation for planet motion
The initial condition for position and velocity need to be outside the loop, prior to loop entry.

más de 4 años hace | 1

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Vector ODE solution is not periodic/ as expected
This index 4 dxdt(4) = -DU^2* x(3)/sqrt(x(1)^2+x(2)^2+x(3)^2)^3; needs to be index 6: dxdt(6) = -DU^2* x(3)/sqrt(x(1)^2+x(2)^...

más de 4 años hace | 0

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How to compile a Fortran subroutine by using the MEX engine
It looks like you are taking input, calling a MATLAB function, and getting output from that function. I still say it would be ea...

más de 4 años hace | 0

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How to create Matrix [1 2 3 4; 2 4 6 8; 3 6 9 12; 4 8 12 16] without using loops or any functions using loops?
n = 4; % whatever result = (1:n) .* (1:n)' % use implicit expansion row .* column

más de 4 años hace | 2

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Vectorising Multiplying each column from a matrix with a square matrix and the tranpose of this column
If you need the same column on each side of the multiply, then maybe this: result = sum(h'*Pn.*h',2);

más de 4 años hace | 1

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Problem in using mxSetPr with USHORT
To attach pointers of type other than double to an mxArray, you can use the mxSetData( ) function as Jan suggests. In your case ...

más de 4 años hace | 1

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Beginner coding; my second, simpler approach at trying to make all elements distinct.
FYI, to generate random integers you can use the randi( ) function instead of ceil(value*rand( )): https://www.mathworks.com/he...

más de 4 años hace | 0

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How to make a "page transpose" in a 3D matrix without using the function pagetranspose?
Mtranspose = permute(M,[2 1 3]);

más de 4 años hace | 2

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How to multiply an inverse matrix (nxn) by an array (nx1) using for loop
Not sure why you have a for-loop at all. Maybe you can explain this. If you just want to multiply the explicit inverse by a vect...

más de 4 años hace | 0

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Adding numbers to an array
You don't really need both h and hnew. Just use h and some indexing. E.g., h = zeros(1,45); % allocate expected result k = 1; ...

más de 4 años hace | 0

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rounding issues in matlab, need to force values to 0
Instead of if abs(y1)< 1e-6 y1=0; end try y1(abs(y1)<1e-6) = 0;

más de 4 años hace | 2

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why will the area only work for the circle and not the other shapes
To compare strings, do not use the == operator which does an elementwise compare. Instead, use a function meant for comparing st...

más de 4 años hace | 0

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if loop error in MALAB
Change your test to if isempty(n)

más de 4 años hace | 0

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Index exceeds number of array elements
I think you want this for i = length(t)-1 to be this instead for i = 1:length(t)-1 The way you have it currently coded, ...

más de 4 años hace | 1

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Calling a Matlab function in Fortran
You have two fundamental errors with this code. You do not use the correct variable type for my_x, and you cannot call mexCallMA...

más de 4 años hace | 0

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MATLAB's inefficient copy-on-write implementation
See Loren's Blog on this topic. Basically, to write functions that can modify a variable "inplace" you need to call that functio...

más de 4 años hace | 1

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How to multiply one array to all elements of a vector with a different size?
You can use implicit expansion with the element-wise multiply operator: c = a .* reshape(b,1,1,[]);

más de 4 años hace | 0

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sprintf, round-off, floating point bug?
I don't have all the versions installed necessary to investigate all of the results posted above, but this may simply be a "ROUN...

más de 4 años hace | 0

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how to save a figure plotted with matlab with best quality in .ppt or .pdf file?
See this FEX submission by Yair Altman: https://www.mathworks.com/matlabcentral/fileexchange/23629-export_fig?s_tid=srchtitle ...

más de 4 años hace | 0

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how to read and write half precision arrays via mexFunction
Very unfortunately, MATLAB has implemented the half precision data type as an opaque classdef type instead of a simple numeric t...

más de 4 años hace | 0

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how to write mex function when input is a matlab function
This can be done, but it will not be efficient. The basic problem is that C/C++ doesn't understand anything about MATLAB functio...

más de 4 años hace | 0

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Is it possible to process the sparse matrix faster with vectorization instead of for loop?
You need to re-evaluate how you are doing things. In the first place, you have the Euclidean calculation wrong. It should be thi...

casi 5 años hace | 0

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How to exchange data between two C++ MEX files
Your current scheme is not foolproof. How does the 1st mex function know when it is safe to unlock and clear memory? How does th...

casi 5 años hace | 0

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How to solve Lc=y without backslash operator?
First, I am assuming there is a typo and the system you are solving is Ly = c, not Lc=y. Second, you made a good start by writi...

casi 5 años hace | 0

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I am using euler's method to solve a differential equation, but when I run the code it doesn't plot.
Take a look at these lines: t0=0; %start time t1= 500; %finish time dt = 100000; Your stepsize is much larger than the total...

casi 5 años hace | 1

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Accessing struct using C library always NULL
Typically, it is best just to post your code so we can see exactly what you are doing, instead of posting a description of your ...

casi 5 años hace | 1

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