Community Profile

# Andrei Bobrov

##### Last seen: Today
4 921 total contributions since 2011

View details...

Contributions in
View by

Delete certain entries in a 3D matrix
A = randi(200,3,30,4);% Let A - our array [3 x 30 x 4] [m,n,k] = size(A); [i,j] = ndgrid(1:n,1:k); idx = [1,1,3,3,3,3,3,3,1,1...

environ 20 heures ago | 0

| accepted

generating sequence number with time sampling
out = cumsum([0;rem(0:23,2)' + 2]); for "t = 1:1000": t = (1:1000); tt = mod(t,2); out = cumsum([0;2 + tt(2:end)]);

environ 22 heures ago | 0

Problems with double looping
Just: ii = 2:8; jj = -(6:12); debt = 132.4 - jj(:) + ii(:)'; debt = debt(:); or with for-loop: ii = 2:8; jj = -(6:12); d...

environ 22 heures ago | 0

| accepted

Count the number of occurrences in a string vector
s = string({'A';'A';'B';'A';'B';'B';'C';'A';'C'}); out = zeros(numel(s),1); [~,~,c] = unique(s); for i = 1:max(c) lo =...

2 jours ago | 1

| accepted

Number of sequences with 3 or more ascending numbers
lo = diff(v) > 0; lo = [~lo(1);lo]; lo2 = [lo(2:end);false]|lo; i = cumsum(lo == 0 & lo2).*lo2; j = accumarray(i + 1,1); C ...

3 jours ago | 0

Processing 2D into 3D matrix
modeshapes = sin(phi + reshape(x,1,1,[]));

8 jours ago | 0

| accepted

out = [(x(1,1):x(end,1))',repelem(x(:,2),[diff(x(:,1));1])];

9 jours ago | 0

Fill in missing NaNs
This question is a repeat of this question: x = [1;2;3;4;nan;nan;nan;nan;nan;5;7;8;nan;nan;nan;nan;11;11;12;nan;nan;nan;15]; ...

9 jours ago | 1

Filling in missing points
In R2016b: T = readtable('weather_laverton.xlsx','Sheet',1); TT = table2timetable(T); TTout = fillmissing(TT,'linear'); Add ...

10 jours ago | 0

How to get all values existing in arrays/matrices?
[a,~,c] = unique(reshape(myArray',[],1),'stable'); out = [a, accumarray(c,1)]; or out = varfun(@(x)x,array2table(myArray(:)),...

16 jours ago | 1

| accepted

find values in vector present in cell array
out = cell(size(cA)); for i = 1:numel(out) x = cA{i}'; [~,out{i}] = ismember(x(:)',V); end or with cellfun [~,out]...

23 jours ago | 1

| accepted

how to extract n rows in a matrix column iteratively?
out = num2cell(reshape(A,3,[]),1); or out = accumarray(ceil((1:numel(A))'/3),A,[],@(x){x});

environ un mois ago | 0

DOT type element wise multiplication of two 2-D matrices with array expansion (3-D)
out3D = A .* permute(B,[3,1,2]); % for R2016a and later out3D = bsxfun(@times,A, permute(B,[3,1,2])); % earlier R2016a

environ un mois ago | 0

| accepted

Convert a vector to single element
signal = dec2bin((0:255)'); or fullfact([2 2 2 2 2 2 2]) - 1; in your case for i = 256:-1:1 signal(i,:) = dec2bin(i-1,...

environ 2 mois ago | 1

| accepted

Extracting a vector from elements of a matrices that are in a cell structure.
V = cat(1,C{:}); V(:,1)' V(:,2)'

environ 2 mois ago | 0

| accepted

converting a matrix sequentially in to single column
Let A - your array. k = 30; [m,n] = size(A); out = reshape(permute(reshape(A,k,[],n),[1,3,2]),[],n);

environ 2 mois ago | 0

| accepted

How to convert datenum to datetime in a MATLAB Table
a=[2 737735.191331019 6 737735.182129630 3 737735.182013889 7 737735.141481482]; T...

3 mois ago | 0

Unique Number Assignment To Each Time
a=[1.1, 1.1, 1.1, 1.2, 1.2, 1.2, 2.1, 2.1, 2.1]' [i,g]=findgroups(a); out = i - 1;

3 mois ago | 0

| accepted

Find max value with multiple conditions
T=readtable('wave height data.xlsx'); [r,rn] = findgroups(T(:,1)); [c,cn] = findgroups(T(:,2)); out = accumarray([r,c],T.Wave...

3 mois ago | 1

| accepted

Count smaller than 15 cells in the table coulumns
T = varfun(@funir,results_excel,'I',2:5); T.Properties.VariableNames = results_excel.Properties.VariableNames(2:end); T.statio...

3 mois ago | 0

Is there a way to find the max value in an array without using the "max" command?
Let A - your array. B = A(:); max_value = B(all(B - B' <= 0));

3 mois ago | 0

Consolidating counts & sum by Year Range
y = [2001, 2002, 2005 2003, 2004, 2007]; A = [2001 2002 2001 2003 2003 2003 2004 2004 2004 2004 2004 2007; 1 ...

3 mois ago | 1

| accepted

Convert Columns Arrays to numeric
...how can I know the data type of the columns? varfun(@class,combine) solution: load('data.mat') combine = [combine,rowfu...

3 mois ago | 1

| accepted

Matrix dimensions must agree error in if loop
day = input('What day is today? -> ', 's'); lo = any(strcmpi(day,{'saturday','sunday'})); if lo disp(['Its ' day ' ! ...

3 mois ago | 0

| accepted

How to solve the following exercise?
function out = find_neighbor(M,i,j) out = all(ismember(1:M(i,j)-1,M(i-1:i+1,j-1:j+1))); end

3 mois ago | 1

| accepted

Collect matrix values by using a "for" loop
Let A - your array. out = reshape(A.',[],1);

3 mois ago | 0

| accepted

How can I convert 2 column matrix to a cell array?

3 mois ago | 0

find common elements from cell array and remove it
out = A(~ismember([A{:}],[B{:}]));

3 mois ago | 0

| accepted