rowDot(X, Y) computes row-wise dot products! ⚡. Works with same-length vectors/arrays or matching matrices. Array vectors need equal-length elements at each position. #DolphinDB #LinearAlgebra #RowOps

rowDenseRank(X) computes row-wise dense rankings! 📊. Matches denseRank logic, with options for order/NA handling. Returns a matrix same size as X. #DolphinDB #Ranking #RowAnalytics.

rowCovar(X, Y) calculates row-wise covariance between X and Y! 📉. Outputs a vector with length matching input rows—great for per-row variance analysis. #DolphinDB #StatsTools #DataRelationships

rowCount(args. ) tallies non-null values row by row! 📊. Returns a vector matching input row count—handy for tracking valid entries across rows. #DolphinDB #DataQuality #RowOperations

rowCorr(X, Y) computes row-wise correlations between X and Y! 📊. Returns a vector with length matching input rows—perfect for per-row relationship analysis. #DolphinDB #DataCorrelation #RowAnalytics

rowBeta(Y, X) calculates row-wise least squares regression coefficients! 📈. Gives a vector matching input row count—ideal for per-row Y-on-X regression estimates. #DolphinDB #Regression #DataAnalysis

rowAvg(args. ) computes element-wise averages row by row! 📐. Returns a vector matching input row count. Perfect for quick row-wise mean calculations across data. #DolphinDB #DataAnalysis #RowOperations

rowAt(X, [Y]) fetches elements by row indices in X! 🎯. Handles int/boolean Y: gets values at indices or where Y is true. Returns nulls for invalid indices. Flexible for matrices/vectors!. #DolphinDB #DataExtraction #RowOperations.

Align financial bid/ask prices across time with rowAlign(left, right, how)! 🔄. Returns index tuples (-1 for no match). Pair with rowAt to fetch elements. Handles "bid"/"ask" vs "allBid"/"allAsk" differences. #DolphinDB #FinTech #PriceMatching.

Finance tool alert: rowAlign(left, right, how) for bid/ask price alignment! 📈. Aligns row vectors, returns index tuple (-1 if no match). Pair with rowAt to fetch elements. Works for column tuples too—see demo for bid/ask differences!. #DolphinDB #PriceAlignment #FinTech.

Want to reduce memory usage on DolphinDB nodes? 🛠️. Check memory stats with getSessionMemoryStat, then use objs to find unreleased variables. Simple steps for better memory management!. #DolphinDB #MemoryOptimization #NodeTips.

Want groups with equal data sums? . Optimal solution is NP-hard. For approximate equal grouping, use built-in volumeBar function. Works well for most cases!. #DataGrouping #DolphinDB #EqualSums

Need to set step size for data retrieval in DolphinDB? . Create a custom range-like function! It lets you specify step sizes easily. Example code available. #DolphinDB #DataRetrieval #CustomFunctions

Need to filter data in a sliding window? . Nest iif for conditional filtering. Example: msum(iif(a>x,0,a), window) does the trick!. #SlidingWindows #DataFiltering #DolphinDB

Wondering if a table column is strictly monotonically increasing?. Use the isSorted function! It’s a simple way to check—see the example for how it works. #DolphinDB #TableChecks #DataValidation

Calculate X-Y inner product of top N elements in sliding windows with mwsumTopN! ⚡. Stably sorts X,Y by S (asc/desc), picks top N, computes inner product. Syntax: mwsumTopN(. ). #DolphinDB #SlidingWindows #InnerProduct

RT @DolphinDB_Inc: 🌐 The future of #IoT and connected systems depends on how well we can manage and analyze massive streams of data in real….

Want to query leaf nodes with recursive CTE in DolphinDB? 🪴. You can achieve similar results using an equi join! Check out the attached code for implementation details. #DolphinDB #CTETricks #LeafNodeQuery

How to use a UDF in a GROUP BY clause? 🛠️. Your UDF must return a vector matching the table’s column length (think "data labels"). GROUP BY then groups by these labels. Example included!. #DolphinDB #UDFTips #GroupByTricks

Need to retain data with misaligned indices in matrix operations? . Use align to match indices first. Fill nulls with 0 (since nulls nullify sums) before calculating. Script included!. #DolphinDB #MatrixOps #DataHandling