Andrei Bobrov
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Accept 20 answers given by other contributors
Awarded to Andrei Bobrov on 29 Mar 2019
Contribute at least one answer each month for 36 consecutive months
Awarded to Andrei Bobrov on 20 Jul 2017
Answer 3 questions that were unanswered for more than 30 days
Awarded to Andrei Bobrov on 20 Jul 2017
100 of your answers have been accepted
Awarded to Andrei Bobrov on 20 Jul 2017
Provide your first answer ever to someone else's question
Awarded to Andrei Bobrov on 20 Jul 2017
15-year anniversary Scavenger Hunt finisher badge
Awarded to Andrei Bobrov on 09 Nov 2016
Solve all the problems in CUP Challenge
Awarded to Andrei Bobrov on 18 Dec 2014
Comment on a problem or solution
Awarded to Andrei Bobrov on 22 Nov 2012
Solve a problem with a best solution
Awarded to Andrei Bobrov on 03 Oct 2012
Be the first to solve a problem
Awarded to Andrei Bobrov on 03 Aug 2012
Solve a problem for the first time
Awarded to Andrei Bobrov on 23 May 2012
Content Feed
How to convert a matrix to a string array:
"A" + R(1,:)' + R(2,:)'
5 meses ago | 1
| accepted
How to create a Matrix
A = reshape(flip(11:22),4,[]) A = reshape(22:-1:11,4,[])
5 meses ago | 0
I keep getting "Array indices must be positive integers or logical values."
x = (.993 : 0.01 : 1.283)'; f = polyval([7;-2;7;-14],x); g = polyval([-19; 3; 16; 8],x);
10 meses ago | 0
Using MAX function to determine which year had the highest value
T = readtable('2020-11-28.txt'); out = T(max(T.tropical_storms) == T.tropical_storms,:)
10 meses ago | 1
I want to convert matrix into vector
a - your array [512 x 512 x 434] out = reshape(a,[],size(a,3))
10 meses ago | 0
| accepted
Add interpolated data at a specific location in the main array.
a =tlv_lis_alt; input = interpol_alt; idx = [29;187]; k = numel(a); b = ones(k,1); [m,n] = size(input); lo = ~isnan(inpu...
10 meses ago | 0
Interpolating data to find the values at NaN locations in the region.
[m,n] = size(v); [i,j] = ndgrid(1:m,1:n); lo = ~isnan(v); F = scatteredInterpolant(i(lo),j(lo),v(lo)); vout = F(i,j); lo2 =...
10 meses ago | 0
| accepted
Finding real roots of cubic polynomial
e = 0.3; gama = 0.8; damp = 0.0031; A = 12; M = 2*10^-4; mu = 0.05/M; St = 0.2; AM = A*M; %parameters Ur = (4:0.1:6)';...
10 meses ago | 1
| accepted
Remove rows/columns with same elements
[~,i] = unique(sort(A,2),'first','rows'); out = A(i,:);
10 meses ago | 0
| accepted
what is "Error using ==> mtimes Inner matrix dimensions must agree."
t = 0:0.05:4; y = t.^2./ (t+1) + 3*exp(-4*t).*cos(5*t) - 2*exp(-3*t)./sin(2*t);
10 meses ago | 0
Matrix multiplication error using '.*'
r = randi(100,66); t = reshape(0:1/55:1,1,1,[]); e = exp(2*pi*i*13*t); t = r.*e;
10 meses ago | 0
rearrangement rows of matrices
A = reshape(1:75,15,[]); a = 5; m = size(A,1); B = reshape(permute(reshape(A,a,m/a,[]),[1,3,2]),a,[]);
10 meses ago | 0
Need to loop through 2 vectors of 0's and 1's, if a 1 occurs in vector 1 before vector 2, then i need to use a specific eqn. if vector 2 has a 1 before vector 1, then i need to use a seperate eqn.Each vector is the same size.
Let a - your Pre_spiketime, b - Post_spiketime. d = a(:) - b(:); e = d.*[true;diff(d)~=0]; t = e ~= 0; l = cumsum(t); out =...
más de 1 año ago | 0
Counting how many times a number occured after a specific number
accumarray(hankel(S(1:end-1),S(end-1:end)),1)
más de 1 año ago | 0
Trying to create polyval but mine only works for a single value of x , how to make it work for an array?
function Y = polyvalali(A,x) Y = x(:) .^ (numel(A)-1:-1:0) * A(:); end
más de 1 año ago | 1
Get max and min of each row in a table and create a new table with those values
Let A - your table. [~,i] = sort(A{1,2:end}); out = A(:,[1,1+i([end:-1:end-2,3:-1:1])]);
más de 1 año ago | 0
Perform AND operations with multiple matrices
i = find(all(cat(3,M{:}) == reshape(c,1,1,[]),3));
más de 1 año ago | 0
Delete certain entries in a 3D matrix
A = randi(200,3,30,4);% Let A - our array [3 x 30 x 4] idx = [1,1,3,3,3,3,3,3,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2]'; ...
más de 1 año 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)]);
más de 1 año ago | 0
| accepted
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...
más de 1 año 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 =...
más de 1 año 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 ...
más de 1 año ago | 0
Processing 2D into 3D matrix
modeshapes = sin(phi + reshape(x,1,1,[]));
más de 1 año ago | 0
| accepted
Adding rows to matrix conditionally
out = [(x(1,1):x(end,1))',repelem(x(:,2),[diff(x(:,1));1])];
más de 1 año 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]; ...
más de 1 año ago | 1
Filling in missing points
In R2016b: T = readtable('weather_laverton.xlsx','Sheet',1); TT = table2timetable(T); TTout = fillmissing(TT,'linear'); Add ...
más de 1 año 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(:)),...
más de 1 año 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]...
más de 1 año ago | 1
| accepted
