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How to find the angle between two quaternions?
For example purposes I am using the coordinate frames as ECI and BODY Q1 = quaternion from ECI->BODY1 Q2 = quaternion from ECI...

casi 7 años hace | 2

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for loop, conditional operator
You are creating the variable filling_degree_regionI_new inside a condition if statement. If the condition is never met, the va...

casi 7 años hace | 0

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Get next or prior single precision value MATLAB function ?
The designers of IEEE floating point were brilliant. The next largest value (in magnitude) is always obtained by just adding 1 t...

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Arrays from c to matlab.
v is pointer-to-double, *v is double. Everywhere inside generation() that you use v it needs to be *v instead.

casi 7 años hace | 0

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Shuffling and Using a Set of Six 52-Card Decks
It is not entirely clear what you want. Maybe this instead of the loop? shuffledcard = decksofcards(randomcards);

casi 7 años hace | 0

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How to add new elements in a big array
Maybe assign into elements of N with indexing: N(j) = length(group);

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filling each row of a matrix using values from a vector
Assuming x starts as a 4x4 matrix (instead of a 3x4 matrix): x(sub2ind(size(x),(1:numel(u))',u)) = 1;

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Convert double array into column vector
Maybe one of these? reshape(f,1,[]) f(:).'

casi 7 años hace | 0

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uint16 to uint8
u16 = your uint16 variable u8 = typecast(u16,'uint8');

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API changes in R2019a?
I don't know if this is the cause of your problems, but there was a change to the low level mxArray variable structure in R2019a...

casi 7 años hace | 0

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complex number inside cell array
This might be done better with a loop, but here is a method using cellfun c = your cell array containing complex numbers resul...

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RK4 orbit problem
Couple of things: 1) You have picked the most convoluted method of coding your equations. Having four separate variables for yo...

casi 7 años hace | 1

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Portable declaration of REAL variables in mex gateway for Fortran
The REAL(kind(0.0D0)) vs REAL*8 discussion (and INTEGER*4 vs INTEGER etc) is a compiler issue, not a mex issue. As long as your...

casi 7 años hace | 0

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The return type of mxIsDouble, mxIsSingle, and mxIsClass (mex for Fortran)
Do what the documentation says and use INTEGER*4. Yes, it is non-standard but you are very unlikely to run into a compiler that...

casi 7 años hace | 0

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How can I generate random single precision (float32) numbers ?
For the generic answer with all bit patterns possible and selected with equal probability (including inf & nan & denorm) your "b...

casi 7 años hace | 1

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How can I show the 4-byte hex representation of a single precison float value?
s = your single float number h = dec2hex(typecast(s,'uint32'),8) And the reverse is s = typecast(uint32(hex2dec(h)),'single')...

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Error using mex: undefined reference for user build package
Try looking in the MATLAB/R2019a/extern/lib folder for versions of these files appropriate for your system. They might have slig...

alrededor de 7 años hace | 0

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Problem with MexFunction and MexGetPr
Impossible to answer without seeing the code for the functionsum( ) function. Maybe you could post that? Maybe all you need to...

alrededor de 7 años hace | 0

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Unexpected numerical error in built-in cross product
When I calculate things from scratch, everything works to the expected precision. E.g., run this code: % From post rTAN = [6.2...

alrededor de 7 años hace | 2

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MEX crashes when called twice in succession (Same input)
Here is one cause of a crash: mwIndex *subs; subs[0]=1; subs[1]=1; You are dereferencing an uninitialized pointer on that se...

alrededor de 7 años hace | 0

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Change sign of descending values
Is this what you want? x = your vector of values d = [1;diff(x)]; x(d<0) = -x(d<0);

alrededor de 7 años hace | 1

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Trouble with declaring function output
function data = importer

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how to iterate a matrix for multiple times
E.g., here is a possible outline n = 30; % the number of iterations M = rand(5,5); % some initial matrix for k=1:n M = 2...

alrededor de 7 años hace | 1

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Using the dms2degree Command Sequentially to Populate an Array using a Sub-routine
With a for-loop, you need to use A in all of your indexing and use the [ ] brackets to form a vector input (and spell the functi...

alrededor de 7 años hace | 0

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Write a function called valid_date that takes three positive integer scalar inputs year, month, day. If these three represent a valid date, return a logical true, otherwise false. The name of the output argument is valid.
Looks like you are taking the same class as Rahul. Rather than repeat my answer here, I will simply direct you to the link: ht...

alrededor de 7 años hace | 3

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sum of multiplication for a vector and matrix
result = sum(b*A);

alrededor de 7 años hace | 1

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I need some help in seeing where I am going wrong and how to proceed with writing a particular funciton for a MATLAB course I am taking please.
Some issues: n is a fixed input ... you should not be changing n inside your function. Get rid of that n = n + 1 statement. T...

alrededor de 7 años hace | 1

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Use of int vs size_t in mex compilation of C-function dgemm.
If you are linking to the MATLAB supplied BLAS/LAPACK libraries, then all of the integer types being used for arguments to these...

alrededor de 7 años hace | 0

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For loop to extract every 3rd column out of matrix and assign as variable name
Do not do this! This will only lead to headaches downstream in your code for processing these variables (you will need to use m...

alrededor de 7 años hace | 1

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random generator on level of bytes
Generate random integers and then multiply them by 8 to guarantee that the result is divisible by 8. E.g., something like: max_...

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