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# Andrei Bobrov

4.881 total contributions since 2011

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Answered
Use of backslash while calculating the product of inverse of a matrix and another matrix
Maybe for "second way": xt = (D+omg*L)\((D*(1-omg)-omg*U)*xn+omg*((D+omg*L)\B));

3 días ago | 0

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Answered
How to code this formula?
function rgb = HSVtoRGB(H,S,V) n = numel(H); C = V.*S; X = C .* (1 - abs(mod(H/60,2) - 1)); A = [C, X, zeros...

3 días ago | 0

Answered
Vector output from a for loop
TMP = randi([-12,45],30,4); f = {@(x)0;@(x)x-9;@(x)1;@(x)3.33 - .083*x;@(x)0}; i = discretize(TMP,[-inf,9,10,28,40,inf]); o...

4 días ago | 0

Answered
How to create 2D matrix from 3D without a loop?
[n,m,k] = size(A); [i,j] = ndgrid(1:n,1:m); C = A(sub2ind([n,m,k],i,j,B);

4 días ago | 0

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Answered
Average of every nth value in a vector
Let A - your array 137255 x 1 n = numel(A); TT = timetable(A,'RowTimes',(0:n-1)'*saconds(.1)); out = retime(TT,'minutely','me...

4 días ago | 0

Answered
CALCULATING THE MEAN OF HOZIRONTAL LINES IN A MATRIX VIA MATLAB
out = mean(A,2) % here A - your array 20 x 50

10 días ago | 0

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Answered
How to create a matrix from csv files?
[~,~,i] = unique(log_files); log_data = datafiles(i,:);

10 días ago | 0

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Need to sort the number in the increasing order using MATLAB script, shown as a sample text file.
T = readtable('new.txt') T = sortrows(T) writetable(T,'new2.txt','delimiter',',','WriteVariableNames',0)

10 días ago | 0

Answered
what is the problem?
f = @(x) 2*(x - (x >= 10)*10) - 7;

10 días ago | 0

Answered
For Loop plot range of numbers
g = reshape(1.4:-.1:1.2,1,1,[]); n = [1.00, 0.975, 0.975, 0.950, 0.925]; M = linspace(1,10,15)'; g1 = g + 1; g_1 = g - 1; A...

10 días ago | 0

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How can I change zeros matrix to 1 by specific points??
A = zeros(8, 8); A(1:3,1:3) = 1; A(5:8,5:8) = 1;

11 días ago | 0

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Counting the number of elements surrounding another element.
Let x - your array with ones and zeros: x = double(rand(10) > .45); out = conv2(double(~x),[1,1,1;1,0,1;1,1,1],'same');

11 días ago | 0

Answered
Finding max value and its position in ed matrix
[m,~,k] = size(C); [C_max_of_page,i] = max(reshape(C,[],k)); index_of_C_max_of_page = [mod(i-1,m)+1; ceil(i/m); (1:k)];

11 días ago | 0

Answered
tresholding by summing over a dimension of a matrix
k = size(micron_62frames,3); lo = sum(micron_62frames,3) > 13e6; micron_62frames(repmat(lo,1,1,k)) = nan;

11 días ago | 0

Answered
Delete end points from columns in a structure array
S = cell2struct(cellfun(@(x)x(3:end-2),struct2cell(S),'un',0),fieldnames(S));

12 días ago | 1

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Answered
Averaging setions of a matix
out = cumsum(A)./(1:size(A,1))'; mnA = out(2:end,:);

12 días ago | 1

Answered
How To Generate Non Repeating floating Random Numbers from 1 to 10
z = cumsum(rand(100,1)); mn = min(z); Z = 9/(max(z) - mn)*(z - mn) + 1; out = Z(randperm(100));

12 días ago | 0

Answered
how to split data with 'or' condition ?
EDIT lo = [diff(tempdata_o4(:,4)) > 0;false]; i = cumsum(diff([false;lo]) == 1).*lo; C = accumarray(i + 1,(1:numel(i))',[],@(...

13 días ago | 0

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Answered
Creating a 2D matrix of non-zero modes from a 3D array
Q(Q == 0) = NaN; out = squeeze(mode(Q)); out(isnan(out)) = 0;

13 días ago | 0

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Answered
For each value in a vector, find the closest value in a cell and return index
sampled_freqs = [495 393 589]; cll = {'G4', 392; 'A4', 440; 'B4', 493.88; 'C5', 523.25; 'D5', 587.33}; [~,i] = min(abs(cat(1...

13 días ago | 2

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Answered
How can I make diamond shape with a matrix?
a = strel('diamond',250); out = kron(a.Neighborhood,[1 2 ; 3 4]);

13 días ago | 1

Answered
Detecting length and number of occurrences in a logical array
Without Toolboxes and Fileexchanges a = accumarray(cumsum([0;diff(array1(:))] == 1).*array1(:)+1,1); out = a(2:end);

13 días ago | 0

Answered
Manually interpolate a 2D array
a = rand(4,8);% Let a - your array F = griddedInterpolant(a); [i,j] = ndgrid(linspace(1,4,10),linspace(1,8,12)); % grid for ...

13 días ago | 1

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Answered
How to separate element from cell?
unique([U{:}])

13 días ago | 0

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Answered
insert specific number of rows into matrix if condition is met and fill new cells with specific value
In your case: n = max(a(:,1)); out = [(1:n)',nan(n,1)]; out(a(:,1),2) = a(:,2);

13 días ago | 1

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Answered
Problems exporting from matlab to exel
AVtNord=[AV;num2cell(A)];

13 días ago | 0

Answered
signature of values ​​when exporting to excel?
A = A'; B = B'; C = C'; writetable(filename,table(A,B,C))

14 días ago | 0

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Answered
summation of matrix in column
final_mat = [ 1 13 25 15 11 11 14 12 12 10 14 1 14 25 15 11 11 14 12 12 ...

14 días ago | 1

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Answered
How do I determine if the desired value in a vector is the Max or Min of the values around it
x = [ 21 19 20 17 16 17 18 16 15 13 15 16]; M = x(hankel(1:3,3:numel(x))); % max [peakmax,i] = max(M); peakmax = peakmax(i ...

14 días ago | 2

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