Answered
How can I apply the attached vector coding equation to a matrix in matlab?
atan2d(y,x) will *not* do any difference calculations such as y(i+1)-y(i) or x(i+1)-x(i) as part of the calculation. So you woul...

10 years ago | 0

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How do I solve a 3x3 matrix with 2 variables?
If you have a direction cosine matrix and want to convert it to a specific Euler Angle sequence, I would recommend this FEX subm...

10 years ago | 1

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Answered
how to delete rows from matrix
Replace your for-loop with this vectorized code: x = all(test_ary==0,2); % Which rows are all 0's test_ary(x,:) = []; ...

10 years ago | 0

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Answered
RANDOM FLIPPING FROM 1 TO -1
Make this change: : p = randperm(n); % <-- Add this line just before for-loop for k=1:n A(p(k)) = -1; % <-- ch...

10 years ago | 0

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Answered
Is it possible to get a Table from an mxArray in a MEX function?
As you have already discovered, the table class is not directly supported in the mex API. The table class is a classdef type of...

10 years ago | 2

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Where to get the C++ api to read structs from MAT Files
You can find C++ API mat stuff here: http://www.mathworks.com/help/matlab/read-and-write-matlab-mat-files-in-c-c-and-fortran....

10 years ago | 0

Answered
Loop through matrix to do calculations under conditions
E.g., using a loop: A = B; for m=1:numel(A) d = B(m) - C(m); if( d > k/2 ) A(m) = A(m) - k; ...

10 years ago | 1

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Answered
Change from 1 to -1
Do you mean iteratively in a loop? E.g., changing elements one at a time in column order: n = numel(A); for k=1:n ...

10 years ago | 1

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Answered
How is the right method to declare a differential equation?
The correct method for dx(2) is method 2. You need to have values defined before they are used. Method 1 will give the wrong res...

10 years ago | 0

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Answered
Can anyone convert this Pseudocode into Matlab?
Looks like Fortran (and assuming f is an array and f_i etc are indexing into the f array). So maybe something like this, with so...

10 years ago | 0

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Hi,, I am trying to do the below problem. Any kind of help would be appreciated.TIA
X = mod(sum(A,2),2);

10 years ago | 0

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Matrix to a table
Are you just trying to concatenate them? E.g., M = [A B;C D];

10 years ago | 0

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Answered
Why do we use Q^(-1)*R*Q when convert quaternion to dcm
The Q^(-1)*v*Q is a standard convention that is widely used in industry, but I have encountered the Q*v*Q^(-1) convention as wel...

10 years ago | 1

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Multidimensional matrices from Fortran to Matlab
The sum function in Fortran sums all of the elements in the array. The / operation in Fortran is an element-wise divide. I.e., ...

10 years ago | 1

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Answered
What does the dot between two variables do?
It depends on what p1 is. If p1 is a struct variable, p2 would be a field of p1. If p1 was a classdef OOP object, then p2 coul...

10 years ago | 0

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Cosine function does not work
You have inadvertently created a variable with the name "cos" that is shadowing the function "cos". Clear the variable, and pic...

10 years ago | 2

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How to join two sequences in matlab?
x = [x1 x2];

10 years ago | 0

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if i have this cell matrix how can delete zero cell?
z(cellfun(@isempty,z)) = [];

10 years ago | 0

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Set up all combinations of column to make several matrices?
An iterative approach: M = [A B C D]; % Your matrix of columns n = size(M,2); % Number of columns n2 = 2^n - 1; % A c...

10 years ago | 0

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Answered
2D Input Array Mex
You can't access 2D matrix values from an mxArray variable like you are doing. I.e., these lines are wrong: double ** Pro...

10 years ago | 4

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get rid of empty spaces in cells containing strings
Another (slower) way: cell_sample = cellfun(@(x)x(x~=' '),cell_sample,'Uni',false)

10 years ago | 0

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I'm not licensed to download any products.Where can I get the license number?
If you are looking for a student or home version, you can start with this link: http://www.mathworks.com/academia/student_ver...

10 years ago | 0

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Matlab engine through C++ - Avoid the opening of the graph
Prior to calling the hist function, create the figure with the 'Visible' property set to 'Off'. E.g., f = figure('Visible',...

10 years ago | 1

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Answered
how to programme to calculate transition probability matrix?
E.g., brute force: m = max(x); n = numel(x); y = zeros(m,1); p = zeros(m,m); for k=1:n-1 y(x(k)) = y(x(k...

10 years ago | 0

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Matlab crashes while running a mex function with data.
This is causing your problem: /* Make sure that the output is of type double and is a scalar */ if(!mxIsDouble(...

10 years ago | 0

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mex.h location
Why aren't you using double quotes? E.g., #include "mex.h"

10 years ago | 0

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Mex file won't compile without -g option
7000 lines of code is not large at all. It is highly unlikely that your problems are related to the size of your source code. ...

10 years ago | 0

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Mex file crashes matlab but then after I continue gives expected output
Mex files that crash MATLAB usually have bugs in them, likely memory related. Something in MATLAB memory got corrupted. It is ...

10 years ago | 0

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Answered
Solving ODE system on matlab
Your plot3 only picks off three points to plot ... it does not plot all of the results. Also, your model derivative function se...

10 years ago | 0

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How can I correct a rounding error??
Welcome to the world of floating point arithmetic. See this post: http://www.mathworks.com/matlabcentral/answers/69-why-does-...

10 years ago | 0