Explore tweets tagged as #sparsearray
Hervé Pagès describe the fast #rstats package in @bioconductor that can compute matrix summarisation operations (rowSums, colSums, rowMeans etc) for sparse matrices in R (dgCMatrix objects) but described limitations and improvements in S4Arrays::SparseArray #bioc2022
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Hervé Pagès package SparseArray is way efficient, faster than dgCMatrix sparse matrix objects, and can accommodate 2D, 3D or arrays, integers, double, string or logicals #RStats @Bioconductor
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Do you know that you can use ArrayMap and SparseArray to optimize your Android Applications?.Android App Optimization Using ArrayMap and SparseArray.Learn from here: Keep supporting, keep learning, keep sharing. #AndroidDev.
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Android App Optimization Using ArrayMap and SparseArray.#AndroidDev #Android #MindOrks #optimization.
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Fun matrix from this theorem!.ListLinePlot[Table[Det[SparseArray[Array[If[#2==1||Divisible[#2,#1],1,0]&,{n,n}]]],{n,1,500}]]
For every n, consider the n x n matrix R(n) whose (i,j) entry is 1 if j=1 or i divides j, and 0 otherwise. [Redheffer 1977]: The following are equivalent:.(1) For every ε>0 we have |det R(n)| = O(n^(1/2 + ε)). (2) The Riemann hypothesis holds.
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4/ Other notable achievements:.- Added a SparseArray type to Rust framework, and a UniqueIdMapper. They both work the same way, if the value stored is equal to its index, then 0 is stored for efficiency.
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Design of Ultrasonic Synthetic Aperture Imaging Systems Based on a Non-Grid 2D Sparse Array.#sparsearray #syntheticapertureimaging #ultrasonicimaging
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Android App Optimization Using ArrayMap and SparseArray.#AndroidDev #Android #Developer #MindOrks #learntocode.
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