Grzegorz Knor
Warsaw Institute of Aviation
1,189 total contributions since 2010Professional Interests: data science, finite element method, signal processing
Grzegorz Knor's Badges
15-year anniversary Scavenger Hunt finisher badge
Awarded to Grzegorz Knor on 09 Nov 2016
Accept 5 answers given by other contributors
Awarded to Grzegorz Knor on 08 Aug 2017
Contribute at least one answer each month for 6 consecutive months
Awarded to Grzegorz Knor on 20 Jul 2017
Solve Project Euler problems using Matlab
Awarded to Grzegorz Knor on 11 Sep 2018
Solve all the problems in R2016b Feature Challenge
Awarded to Grzegorz Knor on 20 Jan 2017
Create 10 problems
Awarded to Grzegorz Knor on 10 Sep 2014
Answer 3 questions that were unanswered for more than 30 days
Awarded to Grzegorz Knor on 20 Jul 2017
100 of your answers have been accepted
Awarded to Grzegorz Knor on 20 Jul 2017
Provide your first answer ever to someone else's question
Awarded to Grzegorz Knor on 20 Jul 2017
Solve all the problems in CUP Challenge
Awarded to Grzegorz Knor on 15 Jan 2014
Solve all the problems in ASEE Challenge
Awarded to Grzegorz Knor on 19 Sep 2013
Solve 500 problems
Awarded to Grzegorz Knor on 04 Sep 2013
Solve all the problems in Tiles Challenge
Awarded to Grzegorz Knor on 03 Sep 2013
Obtain 50 solvers for a problem you have created
Awarded to Grzegorz Knor on 18 Apr 2013
Solved
How to subtract?
*± ± ± ± ± ± ± ± ± ± ±* * Imagine you need to subtract one...
1 year ago
anyone have source code of fuzzy c means?
There is <https://uk.mathworks.com/help/fuzzy/fcm.html fcm> function from <https://uk.mathworks.com/help/fuzzy/index.html?s_cid=...
1 year ago | 1
Question
Live Editor and view neural network
Hi, I would like to add a neural network graphical diagram to my live script. Unfortunately command <https://uk.mathworks.co...
1 year ago | 1 answer | 0
1
answerHow to get 15-min average values from 10 min average values?
I suggest to use interpolation: <https://uk.mathworks.com/help/matlab/ref/interp1.html interp1> t1 = 10:10:60 av1 = [3, ...
1 year ago | 0
save image in matlab
Please read this topic in a documentation: <https://www.mathworks.com/help/matlab/creating_plots/save-figure-at-specific-size-a...
1 year ago | 0
| accepted
Question on imageDataStore syntax and parameters
All 'Name-Value Pair' arguments are described in the documentation: <https://uk.mathworks.com/help/matlab/ref/imagedatastore.ht...
1 year ago | 0
| accepted
re-train a pre-trained autoencoder
To encode data from retrained network you need to create new network, which contains only encoder layer. Please see the code (it...
1 year ago | 0
I want to create random bumps on a flat surface
You can add <https://en.wikipedia.org/wiki/Gaussian_function#Two-dimensional_Gaussian_function Two-dimensional Gaussian function...
1 year ago | 0
| accepted
Read the data from specific line in MATLAB
For the first time use <https://uk.mathworks.com/help/matlab/import_export/import-data-interactively.html Import Tool> and then ...
1 year ago | 0
How could I find the start index of an "approximate" pattern in a binary vector
I would try <https://uk.mathworks.com/help/matlab/ref/regexp.html regular expressions> : case1 = [0 0 0 0 0 0 0 1 1 1 0 0 0...
1 year ago | 0
Logistic Function Transform of vector values
Matrix dimensions must agree. Add dot before division ( */* ): S1=(1./(1 + exp(1).^(-1*Stemp)))
1 year ago | 0
| accepted
Question
Convolutional neural network: parallel layers
Is it possible to create a CNN with parallel layers in MATLAB? For example I would like to build network similar to this one: ...
1 year ago | 2 answers | 2
2
answersHow to determine which algorithm mldivide (A\b) uses
For sparse matrices check function <https://uk.mathworks.com/help/matlab/ref/spparms.html spparms> : spparms('spumoni',2) ...
2 years ago | 1
How to calculate moving average in a matrix?
From MATLAB R2016a there are functions _<https://uk.mathworks.com/help/matlab/ref/movmean.html%20 movmean>_ and _<https://uk.mat...
2 years ago | 0
Create a moving average
From MATLAB R2016a there is a function _<https://uk.mathworks.com/help/matlab/ref/movmean.html%20 movmean>_ which does not requi...
2 years ago | 3
Question
Pareto chart and XTickLabelRotation
Is there a way to plot Pareto chart and rotate XTick labels properly? Let's look at the code: y = randi(1e3,10,1); name...
2 years ago | 1 answer | 0
1
answerSolved
Calculate some equation
Using given inputs x and z, make two outputs that are y1 = (xz)/(x/z)^2 + 14x^2 - 0.8z^2 y2 = x^z - z^x + (x/z)^2 - (z/x...
2 years ago
Solved
Let's get back to school, and create multiplication tables
For a given range, create multiplication tables. (start is always < endno) Example start = 17 endno = 19 Then, ...
2 years ago
Solved
Skip by a multiple
Given an integer create an array of its multiples. Array must have a length of 15
2 years ago
Solved
Rounding off numbers to n decimals
Inspired by a mistake in one of the problems I created, I created this problem where you have to round off a floating point numb...
2 years ago
Solved
Concatenate strings
concatenate a variable number of input strings to produce one outputstring
2 years ago
Solved
Calculate area of sector
A=function(r,seta) r is radius of sector, seta is angle of sector, and A is its area. Area of sector A is defined as 0.5*(r^2...
2 years ago
Solved
Replace values under a limit
For a vector x and number n, the goal is to find every element of x inferior to n and replace it by n. Example x= [ 1 2 3...
2 years ago
Solved
Matrix FUN
Given a Matrix M, find out the number of elements of matrix that are divisible by 3. M = [1 2 3;4 5 6;7 8 9]; ou...
2 years ago
Solved
BASICS - sum part of vector
Please make a function, where as input you get vector "x" and and vector "c", where in "c" vector you get indexes to sum. Examp...
2 years ago
Solved
Summation of array
Given an array, Find the sum of all of the elements in it Examples: Input x = [1 2 3 5; 4 5 6 7]; Output y is 33
2 years ago
Solved
Back to Basics - Find no. of elements in a matrix?
Let A be a m*n matrix. Find the total no. of elements in A ? (Hint - formula based) A = [1 2 3;4 5 6]; output = 6
2 years ago
Solved
Vector creation
Create a vector using square brackets going from 1 to the given value x in steps on 1. Hint: use increment.
2 years ago
Solved
Evil Number
Check if a given natural number is evil or not. Read more at <https://oeis.org/A001969 OEIS>.
2 years ago
Solved
Convert yards to feet
The goal of this script is to convert a value given in yards to feet.
2 years ago