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Gopala has asked 36 questions and find answers to 38 problems.

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Gopala questions

data.table performance not scaling linearly on computing lagged differences of a column by group
shiny reactivePoll re-use for multiple database table names
Pyspark (spark 1.6.x) ImportError: cannot import name Py4JJavaError
Shiny validate not working on zero row data frame?
Fixing a column in Shiny DataTable while Scrolling Right Does not Work
pyspark date_format() and hour() converting timestamp to localtime
Extract a single, numbered table from PDF using PDE package
Shiny modules namespace outside of UI for javascript links
Python pandas read_sas with chunk size option fails with value error on index mismatch
R package teradatasql dbGetQuery taking forever to return somewhat larger data whereas python works very quickly

Gopala answers

sort by first group element dplyr
Creating reactive renderUI
R: how to identify the minimum representative vector/row sets from a list of vectors/dataframe
Delete rows with value frequencies lesser than x in R
Transposing to get single row for each ID's in R
Match two lists, one with partial strings and another with full string, return the whole string if match
Aggregate data.frame for each day
Add column to data frame based on values of another column in another row
Combining starts_with with group_by in dplyr
Tidyr how to spread into count of occurrence [duplicate]