Community Profile

# Michal

Last seen: Today 自 2015 起处于活动状态

Programming Languages:
MATLAB, Fortran
Spoken Languages:
English

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#### Content Feed

extremely inefficient piece of code ... bug?
I have two codes that implement exactly the same task: idx(idx<=0) = 1; idx(idx>=n) = n-1; and if idx <= 0 ...

23 days 前 | 1 个回答 | 0

### 1

linear 1st order ODEs sytem with time-dependent coefficients solver
This problem is now (starting from R2023a) fully covered by LTV models implemented at Control System Toolbox. These LTV models a...

2 months 前 | 0

| 已接受

linear 1st order ODEs sytem with time-dependent coefficients solver
There are two available toolboxes for time-dependent linear 1st order ODEs: LTVtools: https://www.mathworks.com/matlabcentral...

2 months 前 | 0

linear 1st order ODEs sytem with time-dependent coefficients solver
I need to solve many times the following ODEs system: F'(t) = A(t)*F(t) + B(t)*U(t) F(0) = F0 where matrices A(t), B(t) and v...

2 months 前 | 2 个回答 | 0

### 2

simplify is not realible
How to simplify the folowing very simple expression: syms a b c e1 = -(b*(b^2 - 4*a*c)^(1/2) - 4*a*c + b^2)/(2*a*(b^2 - 4*a*c)...

6 months 前 | 0 个回答 | 0

### 0

Merging piecewise polynomial (pp) structures
Is there any method how to merge two or more "pp" (peicewise polynomial) structures in a case of consecutive "pp" structures wi...

6 months 前 | 3 个回答 | 0

### 3

MATLABConnector startup on Linux
Last two versios of MATLABConnector for Linux automatically put the app to the startup list, but in Preferereces settings is not...

6 months 前 | 1 个回答 | 0

### 1

Warning: X does not support locale en_US.UTF-8
Official TMW statement: "This is a warning message that can be disregarded and it has no impact on the functionality of MATLAB....

6 months 前 | 5

| 已接受

Warning: X does not support locale en_US.UTF-8
After application of R2022b_upd5 on linux mint (21.1 Cinammon) I always get the following warning at the startup: Warning: X doe...

7 months 前 | 4 个回答 | 3

### 4

Volterra integral equation solver
I am looking for good (fast and accurate, with recent state of art methods) numerical (not symbolic) Volterra Integral Equation ...

8 months 前 | 0 个回答 | 0

### 0

strange performance behavior - microbenchmark
There are two implementations of the same algorithm: function B = alg1( B, R, alpha ) % Fast computation of L1 distance transf...

10 months 前 | 1 个回答 | 0

### 1

How do I speed up lsim computation in a for loop?
Better than naive using of parfor loop is transform to your final simulation model to the sparse form ... see here Transform m...

10 months 前 | 0

Why does MATLAB crash on Linux with "Inconsistency detected by ld.so: ../elf/dl-tls.c: 597: _dl_allocate_tls_init:"
I have similar problem with MATLAB coder on R2022b (Ubuntu Linux 20.04.3) >> coder >> Inconsistency detected by ld.so: ../elf/...

11 months 前 | 4

INTEL oneAPI support for linux MATLAB
TMW officially does not support INTEL oneAPI compilers (C/C++ and Fortran), but only GCC and GFORTRAN on Linux platform. See her...

11 months 前 | 0 个回答 | 0

### 0

There is an official TMW statement ...

12 months 前 | 2

Free-knot spline approximation (BSFK) problem
@BrunoLuong My data acquisition system produce periodically 1-D measured noised data with the fixed time window length W. I wa...

1 year 前 | 1 个回答 | 0

### 1

Use Java 11 jar files in Matlab
You can use following java compiler (javac) option: --release <release> Compile for a specific VM version. Supported targets: ...

1 year 前 | 0

| 已接受

support of Java11
What are the plans to to use Java11 in future MATLAB releases? So far is still using Java 1.8, but Java 11 is now standard defau...

1 year 前 | 2 个回答 | 0

### 2

decomposition used in parfor
In the following problem, where I need to solve many times same linear system "A" with different right sides "b" is very benefit...

1 year 前 | 1 个回答 | 1

### 1

symbolic integration depends on different equivalent forms of function

1 year 前 | 0

symbolic integration depends on different equivalent forms of function
I performed the following equaivalent symbolic integrations: syms x y A = int(x+y,x); A_ = expand(A); % just expanded...

1 year 前 | 2 个回答 | 0

### 2

multi array vectorization problem (reformulated)
How to vectorize (for-loop elimination) the following code? % init A = [ -0.8013 -0.4981; -0.2278 -0.9009]; t = 0:0.01:...

1 year 前 | 3 个回答 | 0

### 3

How to formulate linear control problem for Stochastic Differential Equation solvers
I have the following linear control problem: x'(t) = A*x(t) + B*u(t) y(t) = C*x(t) + D*u(t) where x(t0) = x0 ... initial co...

1 year 前 | 0 个回答 | 0

### 0

Most effective way to solve nonhomogeneous linear ODE problem
What is the most effective way to solve following "small" linear 1st order ODEs problem: x'(t) = Ax(t) + Bu(t) x(t0) = x0 whe...

1 year 前 | 1 个回答 | 0

### 1

Use Filter Constants to Hard Code Filter
Probably fully functional naive version of filter: function [Y, z] = myFilter(b, a, X, z) % a and b should have same order...

1 year 前 | 0

Algorithm for homogenization of non-equidistant 1-D grid
I am looking for proper algorithm for so called "delta-homogenization" of 1-D non-equidistant grid. Definition: The sorted mono...

2 years 前 | 0 个回答 | 0

### 0

Matlab is significantly slower than Julia on simple evaluation
More and more frequently some people open the question about speed comparison between Matlab and Julia. The main Julia developer...

2 years 前 | 2 个回答 | 2

### 2

expm function problem for stiff matrix
For very specific matrix A: a = -1e20; b = eps; c = 1; A = [a,0,b;0,c,0;-b,0,a]; disp('A:'), disp(num2str(A)) A: ...

2 years 前 | 3 个回答 | 1

### 3

histogram of signals gaps width
This is much more simple Matlab implementation but still not optimal (+ not vectorized): signals = [1.1 NaN NaN NaN -1.4 NaN 8...

2 years 前 | 0

histogram of signals gaps width
I am looking for algorithm (effective + vectorized) how to find histogram of gaps (NaN) width in the following manner: signals ...

2 years 前 | 2 个回答 | 0