select rows satisfying a particular condition

2019 4 25
2 个回答
回答已采纳
更新时间：2019 4 25
6 次查看（30 天）

0 个投票

having a matrix of dim 5 x 10
if i give start_index = 1, and end_index = 3, i wanted to get rows starting with value of start_index and ending with end_index excluding zeros.
eg: rows 4 and 5
cell_matrix = {[1 2 3]
[1 3] }
saved to a cell matrix

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 采纳的回答

Andrei Bobrov
Andrei Bobrov 2019-4-25

1 个投票

% Let A - your array.
[ii,jj,v] = find(A);
z = [ii,jj,v];
z = sortrows(z,[1,2]);
out = accumarray(z(:,1),z(:,3),[],@(x){fun(x,1,3)});
function out = fun(x,b,e)
x = x(:)';
out = [];
if isequal(x([1,end]) , [b,e]) && all(diff(x(:)) > 0)
out = x;
end
end

更多回答（1 个）

Alex Mcaulley
Alex Mcaulley 2019-4-25
编辑：Alex Mcaulley 2019-4-25

1 个投票

a = randi([0,2],5,10);
start_index = 1;
end_index = 3;
b = mat2cell(a(start_index:end_index,:),ones(1,end_index-start_index+1),size(a,2));
b = cellfun(@(x) myfun(x),b,'UniformOutput',false);
function x = myfun(x)
x(x==0) = [];
end

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