Check appearance counts of multiple patters in a cell matrix
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Yi-xiao Liu
am 8 Jan. 2020
Kommentiert: Guillaume
am 9 Jan. 2020
I have 2 cell matrixs:
A =
m×1 cell array
{'abc'}
{'def'}
{'123'}
......
B =
n×1 cell array
{'abcsafadefs2'}
{'dsabcdsdef11'}
{'abcssp123'}
......
I want a output matrix of whether patterns in A has appear 7 times in B:
C =
m×1 logical array
{true}
{true}
{false}
......
So in this example pattern "abc" have matches in exactaly 7 elements in B, so does "def", but not "123".
I now do this with a for loop
for i=1:length(A)
C(i)= (nnz(contains({B}, A(i)))==7);
end
Any way to vectorize the code?
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Guillaume
am 8 Jan. 2020
Any way to vectorize the code?
Not really, you could cellfun it, but that's not vectorisation (cellfun is just a loop in disguise):
C = cellfun(@(a) nnz(contains(B, a)) == 7, A);
Note that if you use a loop, you should preallocate the output:
C = false(size(A));
for i = 1:numel(A)
C(i) = ...
end
4 Kommentare
Guillaume
am 9 Jan. 2020
cellfun(fun, A) applies the function fun to each element of A. Here, fun is the anonymous function:
@(a) nnz(contains(B, a)) == 7
which written as normal function would be equivalent to:
function out = anonymous_function(a)
%unlike normal functions, anonymous functions can capture variables in the enclosing function
%so B is in scope in the anonymous function
out = nnz(contains(B, a)) == 7;
end
which is basically the code you had originally.
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