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## プロフィール

Join date: 2022年5月13日

###### プロフィール

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[n,] = find(A.data 0) C.data = A.data(:,n) C.data is empty A: One of the reasons is related to how the default plotting functions deal with empty sub-matrices when you have plotted subsets in 3D. A simple example: A = randn(5,3); % random matrix with 5 rows and 3 columns % Plot random points in 3D figure(1); plot3(A(:,1),A(:,2),A(:,3),'o') axis equal % Select a sub-matrix that is not empty [n,] = find(A(:,1:3) > 0); % Find elements that are greater than 0 in the first 3 columns A(:,1:3) = A(:,1:3)(n,:); % Copy only these elements to the rest of the matrix % Plot only this sub-matrix figure(2); plot(A(:,1:3),'o'); The function find returns an index matrix where the first column has the indices of the found values and the second column has the indices of the original values. If you do not specify the second argument of find, it returns an empty matrix, therefore all elements of the first matrix are copied to the remaining columns. The reason that C.data is empty is that you plot the other sub-matrix, but you do not plot the matrix A. As a consequence, the code does not plot the entire sub-matrix and thus finds the elements that are not in the plot area. Q: merge hashmaps in php I have 2 hashmaps like: Array ( [name] => Array ( [0] => DPN001 [1] => DPN002 ) [address] => Array [0]

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