How do I extract specific data from an array inside a cell array using indexing?
조회 수: 17 (최근 30일)
이전 댓글 표시
So I have a cell array B of size 4*101 in which each cell contains an array of size 1*3, like this:
B = cell([4 101]);
for i = 1:4
for ii = 1:101
B{i,ii} = rand([1 3]);
end
end
And I need to get the third element of the 1*3 arrays from all cells in the top row of the cell array. I can do that using
C = zeros(101,1)
for i = 1:101
C(i) = B{1,i}(3);
end
But since I need to extract this kind of data quite a lot it'd be a lot nicer to be able to do this in one line using indexing. I figured using
C = B{1,:}(3);
Should work but this gives the error
"Expected one output from a curly brace or dot indexing expression, but there were 101 results."
How do I index this so that it works?
댓글 수: 0
채택된 답변
추가 답변 (2개)
Peng Li
2020년 4월 14일
d = cellfun(@(x) x(3), B);
d gives you the third element from all cells. You can index into d to find those that correspond to the first row.
Ameer Hamza
2020년 4월 14일
편집: Ameer Hamza
2020년 4월 14일
Use can use basic indexing operations in MATLAB without the need to call any function
B = cell([4 101]);
for i = 1:4
for ii = 1:101
B{i,ii} = rand([1 3]);
end
end
result = [B{1,:}];
result = result(3:3:end);
댓글 수: 0
참고 항목
카테고리
Help Center 및 File Exchange에서 Matrix Indexing에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!