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Performance of MEX versus builtin functions
I don't know the answer to your first question. But I would expect the overhead for the mex function entry (other than loading i...
4 jours il y a | 0
mxArray values of plhs[] on entry to mexFunction()
I am unaware of any way to detect this in a mex function. It would be nice, of course, so that mex code could avoid some unnece...
environ un mois il y a | 1
| A accepté
Find roll, pitch, and yaw from the same vector in two different coordinate systems
If you just want a "minimum angle rotation" solution, you can form a rotation quaternion from the vectors and then convert the q...
environ 2 mois il y a | 0
Array Indices error while plotting an exponential function.
Maybe this is what you want. Use f instead of f(t), and use .* (element-wise multiply) instead of * (matrix multiply). The syn...
4 mois il y a | 0
| A accepté
mxCreateDoubleMatrix - what value is used to initialize the array ? Documentation incomplete
I agree that the official documentation could maybe be written better regarding how elements are initialized. I.e., simply addin...
5 mois il y a | 0
| A accepté
Matlab crashed when running Pardiso mex file with certain input size
I haven't had time to look at this thoroughly, and I am unfamiliar with PARDISO, but the symptoms you describe are usually the c...
9 mois il y a | 0
Setting the Output of a MEX Function as One of the Inputs After In Place Manipulation
A couple of problems. 1) First, your crash is caused by this: mxSetDoubles(plhs[0], mxGetDoubles(prhs[1])); You cannot atta...
9 mois il y a | 1
| A accepté
Question
Why is vpa not converting double accurately?
I ran across this example that I don't understand. I don't use the Symbolic Toolbox much, but I thought vpa by default converte...
10 mois il y a | 1 réponse | 3
1
réponseMatlab crashes when Intel MKL's function Pardiso is called
Just seeing this post. Too late for OP, but for future readers here are my comments: ---------------------------------------- ...
10 mois il y a | 0
Plots saved as JPEG look awful. How to improve?
You might also explore export_fig from Yair Altman, found here: https://www.mathworks.com/matlabcentral/fileexchange/23629-expo...
10 mois il y a | 0
need to vectorize efficiently calculating only certain values in the matrix multiplication A * B, using a logical array L the size of A * B
You can try this naive mex routine. Not optimized at all for cache hits or patterns in L. Might be faster to transpose A first, ...
11 mois il y a | 1
| A accepté
ode45 code for 2 body problem
Your system has an initial non-zero total linear momentum. Recall that the 2-Body Problem has a constant center of mass motion ...
11 mois il y a | 0
| A accepté
Get total number of leap seconds relative to gps time
To convert a GPS timestamp to a UTC time, use the UTCLeapSeconds time zone which automatically accounts for leap seconds in the ...
environ un an il y a | 0
How to use datetime with leap second strings?
@Peter Perkins Thanks for the reply. My comments ... "... I'd be curious to hear where you are getting timestamps that honor l...
environ un an il y a | 0
How to preserve nanosecond precision in datetime calculations (for large numbers)
This question already has an accepted answer, but I would like to add my observations on this topic. datetime: Internally hold...
environ un an il y a | 0
Question
How to use datetime with leap second strings?
Suppose we have the following date time string: ds1 = "30-Jun-1972 23:59:59.5"; You can convert that to a datetime easily: da...
environ un an il y a | 3 réponses | 0
3
réponsesWhy Is Colon Operator Not Equivalent To linspace Command?
The short answer is that the algorithms are different. In the first place, 0.08 cannot be represented exactly in IEEE double pre...
environ un an il y a | 3
C++ Mex function being passed a MATLAB class object
mxDuplicateArray( ) does indeed create deep copies ... or at least it used to. Not sure why that would have changed. There migh...
environ un an il y a | 1
| A accepté
Error using mex, building with 'MinGW64 Compiler (FORTRAN)'
FYI, you should never use literal constants in a Fortran API call, because you can't be sure whether the literal integer(4) or i...
environ un an il y a | 1
How to pass a Matlab function handle to C-Mex Code
To use a function handle in a mex function with C array as an input to the function handle, you can use mexCallMATLAB( ) with th...
environ un an il y a | 2
| A accepté
Kalman Filter Velocity data looking too similar to position data
Your velocity vf and position rf calculations as shown represent "change" over dt, not current value. Think about it. If you had...
plus d'un an il y a | 0
| A accepté
Is giving a space after comma in functions the convention?
A MATLAB specific thing that is somewhat related is that spacing is important in concatenation. E.g., the following look similar...
plus d'un an il y a | 1
My Numerical Solution doesn't align with the exact solution
Assuming your state is [vc,vc'] in that order, then it appears your initial conditions are backwards and should be this instead:...
plus d'un an il y a | 1
How can I find index of element in array?
To find the index of a specific integer value (without roundoff error) in an array of integers, use the "find" function and == o...
plus d'un an il y a | 33
| A accepté
Order terms in symbolic poly converted to string
Brute force if you need the string for some reason? syms x ex = taylor(exp(x),order=3) [C,T] = coeffs(ex) terms = fliplr(C.*...
plus d'un an il y a | 2
How can we convert a datetime into a string that represents a Unix timestamp in nanoseconds?
Another workaround that avoids the lossy duration type issues and doesn't need the messy struct solution for this particular cas...
plus d'un an il y a | 0
Write a function called freezing that takes a vector of numbers that correspond to daily low temperatures in Fahrenheit. Return numfreeze, the number of days with sub freezing
Hint: Is it freezing when the temperature is above 32 or below 32? And what have you coded?
plus d'un an il y a | 2
How to do differentiation in Matlab
Are you just asking for piecewise linear differencing for derivative calculations between the points? E.g., THT = 0:12:360; L...
plus d'un an il y a | 0
| A accepté
Matlab got this wrong: Limit as n goes to infinity: (1+(i/n))^(n^2). Matlab says it's exp(2), which is wrong. Pls confirm.
I have been looking at this for a couple of days now and have finally convinced myself that this limit doesn't exist and MATLAB ...
plus d'un an il y a | 0
Question
Duration type doesn't preserve seconds accuracy
I've been working on some time conversion routines and ran into an issue I didn't expect. Basically, the duration type doesn't p...
plus d'un an il y a | 2 réponses | 0
