And I have another matrix 'wt', with first element. Since you seem to be iterating over the rows of the matrix, maybe you can tell us more about what you want to do with those logical indices?Īlso, you can get the unique rows of your matrix by a simple call to unique: julia> A = vcat((a,b,a,a,a,a,b,b,b). Dear all, Hello, I am writing a simple function of ismember to check if an element in one matrix matches the one in another matrix, however it returns 0, although I am sure the value matches. LiA ismember (A,B,vars) returns a vector of logical values the same length as A. The output vector, LiA, has value 1 (true) in the elements that correspond to observations in A that are also present in B, and 0 (false) otherwise. Using filter! reduces the use of temporary arrays. LiA ismember (A,B) for dataset arrays A and B returns a vector of logical values the same length as A. Specify two outputs, row and col, to return the row and column. Does a multi-dimensional version of this funct. Find the nonzero elements in a 4-by-2-by-3 array. For 2D data, the bwboundaries function does this very well. In contrast, Julia provides the higher order functions filter and filter!, allowing users to write filter(z->z>3, x) and filter!(z->z>3, x) as alternatives to the corresponding transliterations x and x = x. Other answers are probably simpler for this case, but for completeness I thought I would add the use of cellfun with an anonymous function. Hello, I am trying to get the boundaries of objects in a three-dimensional array. In MATLAB, an idiomatic way to remove unwanted values is to use logical indexing, like in the expression x(x>3) or in the statement x(x>3) = to modify x in-place. Note that logical indexing creates a temporary array (the vector saving the indices), potentially leading to slower than necessary code if they are created in a hot loop. = bt_edges),dims=2)Īnd return a logical vector like in the MATLAB code. broadcasted uval = all(in.(bt_edges',bt_edges),dims=2) I can’t see much difference between the two: using BenchmarkTools
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