C RUBY-ON-RAILS MYSQL ASP.NET DEVELOPMENT RUBY .NET LINUX SQL-SERVER REGEX WINDOWS ALGORITHM ECLIPSE VISUAL-STUDIO STRING SVN PERFORMANCE APACHE-FLEX UNIT-TESTING SECURITY LINQ UNIX MATH EMAIL OOP LANGUAGE-AGNOSTIC VB6 MSBUILD

# Find all mappings between two binary vectors of same size?

By : user2950511
Date : November 17 2020, 11:55 AM
With these it helps The following solution finds all the places in B where zeroes can go (T0), and where ones can go (T1). Then it loops through all those permutations, producing each mapping.
code :
``````A = [0 0 0 1 1 0 1 0];
B = [1 1 0 0 0 0 0 1];

l = length(A);

T0 = perms(find(B==0)); % all targets for zeroes
T1 = perms(find(B==1)); % all targets for ones

s0 = find(A==0); % source of zeroes
s1 = find(A==1); % source of ones

nT0 = size(T0,1);
nT1 = size(T1,1);

q = zeros(1,l);

for i = 1:nT0
t0 = T0(i,:); % current target for zeroes
for j = 1:nT1
t1 = T1(j,:); % current target for ones
q(s0) = t0;
q(s1) = t1
% q has a mapping
end
end
``````

Share :

## Find all possible injective mappings of 2 vectors

By : NotSoGreat
Date : March 29 2020, 07:55 AM
should help you out I have 2 vectors: , You basically need to compute all permutations of the range vector B:
code :
``````perms(B).'
``````
``````aux = perms(B);
mappings = unique(aux(:,1:length(A)),'rows').';
``````
``````>> reshape([repmat(A.',1,size(mappings,2)); mappings],length(A),[])

ans =
1     5     1     5     1     4     1     4     1     3     1     3
2     4     2     3     2     5     2     3     2     4     2     5
``````

## find the vector with the largest size among group of vectors c++

By : stendu
Date : March 29 2020, 07:55 AM
will be helpful for those in need The comparison functor object passed to std::max_element should return true if the first operand is less than the second one. Your comparison has this the wrong way around. You need
code :
``````bool Longest(const vector<int> &A, const vector<int> &B)
{
return A.size() < B.size();
}
``````

## Is LSH about transforming vectors to binary vectors for hamming distance?

By : Ajay Acharya
Date : March 29 2020, 07:55 AM
around this issue 1) You can bypass it, but then you will work in D dimensions, not N as you say. where N << D. That means that the algorithm has to adapt to D dimensions as well.

## Efficient solution to find the number of unique binary vectors

By : Johnny Richie Kasali
Date : March 29 2020, 07:55 AM
I wish this helpful for you I'd use the inclusion-exclusion principle. You want to know the cardinality of the union of the set. For your example you have:
code :
``````N(X11X || 1XX1 || 11XX) = N(X11X) + N(1XX1) + N(11XX) -
N(X11X && 1XX1) - N(X11X && 11XX) - N(1XX1 && 11XX) +
N(X11X && 1XX1 && 11XX)
``````
``````N(X11X && 1XX1) = 1 * 1 * 1 * 1 = 1.
``````

## What is the fastest way to find orphans between two large (size ~900K ) Vectors of Strings in Java?

By : Bruno Accorsi
Date : March 29 2020, 07:55 AM
Hope that helps I'm currently working on a Java program that is required to handle large amounts of data. I have two Vectors... , Use a HashSet for the lookups.
Explanation: