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
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Awarded to Andrei Bobrov on 20 Jul 2017
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Awarded to Andrei Bobrov on 09 Nov 2016
Solve all the problems in CUP Challenge
Awarded to Andrei Bobrov on 18 Dec 2014
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Awarded to Andrei Bobrov on 22 Nov 2012
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Awarded to Andrei Bobrov on 03 Oct 2012
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Content Feed
How to convert a matrix to a string array:
"A" + R(1,:)' + R(2,:)'
5 mesi ago | 1
| accepted
How to create a Matrix
A = reshape(flip(11:22),4,[]) A = reshape(22:-1:11,4,[])
5 mesi 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);
11 mesi 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,:)
11 mesi ago | 1
I want to convert matrix into vector
a - your array [512 x 512 x 434] out = reshape(a,[],size(a,3))
11 mesi 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...
11 mesi 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 =...
11 mesi 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)';...
11 mesi ago | 1
| accepted
Remove rows/columns with same elements
[~,i] = unique(sort(A,2),'first','rows'); out = A(i,:);
11 mesi 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);
11 mesi 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;
11 mesi 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,[]);
11 mesi 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 =...
oltre un anno ago | 0
Counting how many times a number occured after a specific number
accumarray(hankel(S(1:end-1),S(end-1:end)),1)
oltre un anno 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
oltre un anno 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])]);
oltre un anno ago | 0
Perform AND operations with multiple matrices
i = find(all(cat(3,M{:}) == reshape(c,1,1,[]),3));
oltre un anno 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]'; ...
oltre un anno 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)]);
oltre un anno 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...
oltre un anno 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 =...
oltre un anno 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 ...
oltre un anno ago | 0
Processing 2D into 3D matrix
modeshapes = sin(phi + reshape(x,1,1,[]));
oltre un anno ago | 0
| accepted
Adding rows to matrix conditionally
out = [(x(1,1):x(end,1))',repelem(x(:,2),[diff(x(:,1));1])];
oltre un anno 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]; ...
oltre un anno ago | 1
Filling in missing points
In R2016b: T = readtable('weather_laverton.xlsx','Sheet',1); TT = table2timetable(T); TTout = fillmissing(TT,'linear'); Add ...
oltre un anno 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(:)),...
oltre un anno 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]...
oltre un anno ago | 1
| accepted
