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

ungefär 2 månader ago | 1

Answered
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...

ungefär 2 månader ago | 0

Answered
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...

ungefär 2 månader ago | 0

Answered
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...

ungefär 2 månader ago | 1

Answered
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')...

ungefär 2 månader ago | 0

| accepted

Answered
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...

2 månader ago | 0

Answered
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...

2 månader ago | 0

| accepted

Answered
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...

3 månader ago | 2

Answered
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...

3 månader ago | 0

Answered
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);

3 månader ago | 1

| accepted

Answered
Trouble with declaring function output
function data = importer

3 månader ago | 1

| accepted

Answered
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...

3 månader ago | 1

| accepted

Answered
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...

3 månader ago | 0

Answered
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...

3 månader ago | 0

| accepted

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

3 månader ago | 1

Answered
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...

3 månader ago | 1

| accepted

Answered
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...

3 månader ago | 0

| accepted

Answered
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...

3 månader ago | 1

| accepted

Answered
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_...

3 månader ago | 3

| accepted

Answered
Calculate sum of series using for
Here is an outline to get you started: a = something; % you put a value here m = something; % you put a value here x = someth...

3 månader ago | 1

| accepted

Answered
Decimal to Binary Conversion
E.g., bstream = reshape(b',1,[]); If you want characters, then bstream = char(reshape(b',1,[]) + '0');

3 månader ago | 1

| accepted

Answered
How to output a vector/array from a created function
Don't use size(inputVector) for your loop indexing limits since this is a vector. Use numel(inputVector) instead. Also, you sho...

3 månader ago | 0

Answered
Cpp to Mex conversion
Looks like you have a mismatch with variable types, probably an older piece of code that you are trying to compile on a newer MA...

3 månader ago | 1

| accepted

Submitted


mxGetPropertyPtr & mxSetPropertySDC C-mex functions
Fast memory efficient alternative to API functions mxGetProperty & mxSetProperty.

3 månader ago | 4 downloads |

Answered
how to solve 'Error using | Matrix dimensions must agree. ' ?
Maybe this line: while (Lia2_One_Three ~= zeros(length(Lia2_One_Three),1) | Lia2_Two_Three ~= zeros(length(Lia2_Two_Three),1)...

3 månader ago | 0

| accepted

Answered
Print from C file into Command window via MexFile
"However I would like to print directly from the c-file to Matlab Command Window. Is that possible?" Yes, that is what mexPrint...

3 månader ago | 1

| accepted

Answered
could anyone help me to solve the issue with respect to the code
The syntax of a for-loop is: for k=1:5 % your code here end

3 månader ago | 0

Answered
Subtracting matrices using a for loop
diff(your_data,1,3)

3 månader ago | 0

Answered
How can I see the filter function implementation code at MATLAB?
In general, if the function has an associated .m file then TMW is willing to show you that much. Also there may be information ...

3 månader ago | 1

Answered
If else problem for year
All of those if-elseif blocks make the code difficult to read, and difficult to debug as well. I would advise against that appr...

3 månader ago | 0

| accepted

Load more