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Answered
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...
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...
2 months ago | 0
Answered
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...
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...
2 months ago | 1
| accepted
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...
3 months ago | 1 answer | 3
1
answerAnswered
Matlab 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: ---------------------------------------- ...
Matlab 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: ---------------------------------------- ...
3 months ago | 0
Answered
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...
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...
3 months ago | 0
Answered
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, ...
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, ...
4 months ago | 1
| accepted
Answered
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 ...
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 ...
4 months ago | 0
| accepted
Answered
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 ...
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 ...
7 months ago | 0
Answered
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...
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...
7 months ago | 0
Answered
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...
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...
7 months ago | 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...
7 months ago | 3 answers | 0
3
answersAnswered
Why 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...
Why 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...
7 months ago | 3
Answered
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...
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...
7 months ago | 1
| accepted
Answered
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...
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...
8 months ago | 1
Answered
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...
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...
8 months ago | 2
| accepted
Answered
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...
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...
8 months ago | 0
| accepted
Answered
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...
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...
9 months ago | 1
Answered
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:...
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:...
9 months ago | 1
Answered
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...
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...
9 months ago | 33
| accepted
Answered
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.*...
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.*...
11 months ago | 2
Answered
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...
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...
12 months ago | 0
Answered
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?
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?
1 year ago | 2
Answered
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...
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...
1 year ago | 0
| accepted
Answered
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 ...
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 ...
1 year ago | 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...
1 year ago | 2 answers | 0
2
answersAnswered
Rank 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...
Rank 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...
1 year ago | 0
Answered
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...
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...
1 year ago | 1
Answered
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...
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...
1 year ago | 1
| accepted
Answered
What does it mean "/Multiple" after variable name in *.mat file?
If the file is written by a 3rd party tool, it is probably written in uncompressed format. In that case, and if the /Multiple is...
What does it mean "/Multiple" after variable name in *.mat file?
If the file is written by a 3rd party tool, it is probably written in uncompressed format. In that case, and if the /Multiple is...
1 year ago | 1
| accepted
Answered
Having issues writing matrix to a binary file.
@Rikin You forgot to read in the sizes. You only read in the double data. The two int32 variables at the front obviously were pa...
Having issues writing matrix to a binary file.
@Rikin You forgot to read in the sizes. You only read in the double data. The two int32 variables at the front obviously were pa...
1 year ago | 1
