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Add matrix to matrix
B = {B1;B2;B3;B4...;Bi}; % Please create B array. n = cellfun(@numel,B); A = [cell2mat(B),repelem((1:numel(n))',n)];...

8 years ago | 0

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I need to do some matrix manipulation for a longitudinal study. See description and image below.
A - your array; out = [kron(A(:,1),ones(size(A,2)-1,1)), reshape(A(:,2:end)',[],1)]

8 years ago | 0

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Swapping the elements in a matrix
A = [0.8 0.7 0.9 0.5;0.6 0.4 0.9 0.7;0.8 0.5 0.6 0.5;0.8 0.6 0.5 0.4]; n = size(A,1); for ii = rem(0:(n-1)^(n-1)-1,n-1...

8 years ago | 0

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Test for balanced parentheses
Given the input inStr, give the boolean output out indicating whether all the parentheses are balanced. Examples: * If ...

8 years ago

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Pattern matching
Given a matrix, m-by-n, find all the rows that have the same "increase, decrease, or stay same" pattern going across the columns...

8 years ago

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square number
Square a number

8 years ago

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Function Iterator
Given a handle fh to a function which takes a scalar input and returns a scalar output and an integer n >= 1, return a handle f...

8 years ago

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How to call index of vector in matrix?
A = [... 6 -3 4 7 8 -5 -4 8 6 7 1 8 3 6 4 ...

8 years ago | 1

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Knight's Tour Checker
Given a matrix a, determine whether or not a legal <http://en.wikipedia.org/wiki/Knight's_tour knight's tour> is present. The kn...

8 years ago

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how to find the second most repeated value in vector
[g,v] = findgroups(x); ii = accumarray(g(:),1); jj = find(ii > 1); out = [v(jj(2)), ii(jj(2))]

8 years ago | 2

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What is the best way to create a 10x11 matrix from a 2x100
Let A - your matrix [100 x 2] b = sortrows(A); out = [unique(b(:,1)), reshape(b(:,2),[],10)];

8 years ago | 1

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How to use a vector for filling columns of table
cell2table([{num2str(457888)}, {'error'}, num2cell(zeros(1, size(new_table,2)-2))])

8 years ago | 1

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How do you use ndgrid
Lengths = [1, 20,40,60,75]; Angle = [.7999,.9002,.9999,1.1001,1.1999]; A = rand(5,5); [x,y] = ndgrid(-5:0.8:5); ...

8 years ago | 1

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how to horizontally concatenate two strings, being one a cell array and the other a num2str converted gpuarray?
C = { 'CELL:','CELLA:','CHAR:','GCH4:','GH2:' } S = string(C) + [.1:.1:.5;.1:.2:.9] out = join(S,',');

8 years ago | 0

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Average timestamp 20 seconds interval data into hourly
for older version MATLAB: T = readtable('data.xls'); [Y M D H] = datevec(T{:,1}); [~,~,T.groups] = unique([Y M D H],'...

8 years ago | 0

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Target sorting
Sort the given list of numbers |a| according to how far away each element is from the target value |t|. The result should return...

8 years ago

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Counting Sequence
Given a vector x, find the "counting sequence" y. A counting sequence is formed by "counting" the entries in a given sequence...

8 years ago

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Replace each element of a matrix with the number it is closest to in a set of discrete values without using for loop
A = [2 4], B = [1.1, 3.2, 5, -17] [~, ii] = min(abs(bsxfun(@minus,B(:),A(:).')),[],2); % MATLAB <= R2016a [~, ii] = ...

8 years ago | 1

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Answered
Delete rows with characters in cell array
My ruble: A={'1 TITLE 13122423'; '2 NAME Bob'; '10 PROVIDER James'; '44 234 456 234 345'; '48 344 454 462 435';...

8 years ago | 3

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How to split divide an array on specific sections?
GC = accumarray(data(:,1),(1:size(data,1))',[],@(x){data(x,:)});

8 years ago | 3

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Which values occur exactly three times?
Return a list of all values (sorted smallest to largest) that appear exactly three times in the input vector x. So if x = [1 2...

8 years ago

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Who Has the Most Change?
You have a matrix for which each row is a person and the columns represent the number of quarters, nickels, dimes, and pennies t...

8 years ago

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Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

8 years ago

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Averaging points within data set
x=importdata('yourfile.txt'); xavg=accumarray(rem((0:numel(x)-1).',720)+1,x(:),[],@mean);

8 years ago | 0

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Answered
create matrix from loop in matlab
[ii,jj] = ndgrid(1:400); x = [ii(:),jj(:)]; a = round(atan2d(200 - ii(:), jj(:) - 200)); idx = discretize(a,0:5:90); ...

8 years ago | 1

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Find the midpoint between the two points (1, -7) and (-1, -23).
homework? P1 = [1, -7]; P2 = [-1, -23]; out = (P1(:) + P2(:)).'/2

9 years ago | 3

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Answered
How to create a vector with several repetitions of a random permutation
x = 1:4; ii = 2; x1 = repmat(x(:)',1,ii); out = x1(randperm(numel(x1)))

9 years ago | 2

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I have an array of data [ 1.1 0.5 1.8 2.5 5.0 4.2 3.3 4.8 2.5] After the first number (1.1) need pick the next higher number which is 1.8 until until you get to the peak (5.0) then pick the number in descending order from the peak to the lowest
data = [1.1 0.5 1.8 2.5 5.0 4.2 3.3 4.8 2.5]; [~,ix] = max(data); ii = false(size(data)); r = data(1); for jj = ...

9 years ago | 0

Answered
Adding a row vector to multiple rows of a matrix, with duplicate row index
ii = [1;2;1]; a = unique(ii); A(a,:) = A(a,:) + accumarray(ii,1)*[1, 1]

9 years ago | 0

Answered
cumsum reset back to zero every 100 times
with "zeros" m = 100; n = numel(R); R1 = R(:); R1(m+1:m:n) = 0; d = accumarray(ceil((1:n)'/m),R1); R1(m+1:m:...

9 years ago | 0