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Feeds
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...
24 giorni fa | 0
| accettato
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...
circa 2 mesi fa | 0
| accettato
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...
6 mesi fa | 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...
6 mesi fa | 1
| accettato
Domanda
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...
6 mesi fa | 1 risposta | 3
1
rispostaMatlab 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: ---------------------------------------- ...
6 mesi fa | 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...
7 mesi fa | 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, ...
7 mesi fa | 1
| accettato
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 ...
7 mesi fa | 0
| accettato
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 ...
10 mesi fa | 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...
10 mesi fa | 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...
10 mesi fa | 0
Domanda
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...
10 mesi fa | 3 risposte | 0
3
risposteWhy 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...
10 mesi fa | 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...
11 mesi fa | 1
| accettato
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...
11 mesi fa | 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...
11 mesi fa | 2
| accettato
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...
12 mesi fa | 0
| accettato
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...
12 mesi fa | 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:...
circa un anno fa | 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...
circa un anno fa | 33
| accettato
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.*...
circa un anno fa | 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...
oltre un anno fa | 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?
oltre un anno fa | 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...
oltre un anno fa | 0
| accettato
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 ...
oltre un anno fa | 0
Domanda
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...
oltre un anno fa | 2 risposte | 0
2
risposteRank value matrix from 3d Matrix
Might be easier to permute first so that your 2D matrices are in the first two spots. Then simply use sort() to get the rank ind...
oltre un anno fa | 0
Error with matrix calculation
We don't have all the variables necessary to run your code, but guessing that maybe you need element-wise divide instead of matr...
oltre un anno fa | 1
Unable to resolve the name 'half.typecast'
half is an opaque data type in MATLAB, not a regular numeric type like double and single. I tried to get TMW to change this to a...
oltre un anno fa | 1
| accettato
