# Michal

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**Feeds**

Question

fast evaluation of x(k+1) = x(k)*e(k)

Is there any special trick how to evaluate fast this recurrent formula: x(1) = x0 x(k+1) = x(k)*e(k), k= 1,2, ...N-1 where N...

6 months ago | 1 answer | 0

### 1

answerQuestion

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 ...

10 months ago | 1 answer | 0

### 1

answerlinear 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...

11 months ago | 0

| accepted

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...

11 months ago | 0

Question

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...

11 months ago | 2 answers | 0

### 2

answersQuestion

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)...

1 year ago | 0 answers | 0

### 0

answersQuestion

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...

1 year ago | 3 answers | 0

### 3

answersQuestion

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...

1 year ago | 1 answer | 0

### 1

answerWarning: 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....

1 year ago | 5

| accepted

Question

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...

1 year ago | 4 answers | 3

### 4

answersQuestion

Volterra integral equation solver

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

1 year ago | 0 answers | 0

### 0

answersQuestion

strange performance behavior - microbenchmark

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

1 year ago | 1 answer | 0

### 1

answerHow 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...

1 year ago | 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/...

1 year ago | 6

Question

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...

1 year ago | 1 answer | 0

### 1

answerI have received "deactivation required"

There is an official TMW statement ...

1 year ago | 2

Question

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...

2 years ago | 1 answer | 0

### 1

answerUse Java 11 jar files in Matlab

You can use following java compiler (javac) option: --release <release> Compile for a specific VM version. Supported targets: ...

2 years ago | 0

| accepted

Question

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...

2 years ago | 2 answers | 0

### 2

answersQuestion

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...

2 years ago | 1 answer | 1

### 1

answersymbolic integration depends on different equivalent forms of function

Simple <https://www.mathworks.com/matlabcentral/answers/507683-why-does-x-x-y-dy-give-a-x-3-component#answer_418071 solution> to...

2 years ago | 0

Question

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...

2 years ago | 2 answers | 0

### 2

answersQuestion

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:...

2 years ago | 3 answers | 0

### 3

answersQuestion

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...

2 years ago | 1 answer | 0

### 1

answerQuestion

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...

2 years ago | 1 answer | 0

### 1

answerUse 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...

2 years ago | 0

Question

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 ago | 0 answers | 0

### 0

answersQuestion

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 ago | 2 answers | 3

### 2

answersQuestion

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: ...

3 years ago | 3 answers | 1

### 3

answershistogram 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...

3 years ago | 0