Mark Needham markhneedham.com

Lessons from running Neo4j based 'hackathons'

markhneedham.com·605w

Conceptual Model vs Graph Model

markhneedham.com·605w

R: A first attempt at linear regression

markhneedham.com·606w

Neo4j: Generic/Vague relationship names

markhneedham.com·606w

PostgreSQL: ERROR: column does not exist

markhneedham.com·606w

R: Deriving a new data frame column based on containing string

markhneedham.com·606w

R: Filtering data frames by column type ('x' must be numeric)

markhneedham.com·606w

Neo4j: COLLECTing multiple values (Too many parameters for function 'collect')

markhneedham.com·607w

Neo4j: LOAD CSV - Column is null

markhneedham.com·607w

R: ggplot - Plotting multiple variables on a line chart

markhneedham.com·608w

R: ggplot - Plotting a single variable line chart (geom_line requires the following missing aesthetics: y)

markhneedham.com·609w

R: Calculating rolling or moving averages

markhneedham.com·609w

R: ggplot - Cumulative frequency graphs

markhneedham.com·610w

R: dplyr - group_by dynamic or programmatic field / variable (Error: index out of bounds)

markhneedham.com·611w

R: Grouping by week, month, quarter

markhneedham.com·611w

Neo4j: LOAD CSV - Handling empty columns

markhneedham.com·612w

R: Rook - Hello world example - 'Cannot find a suitable app in file'

markhneedham.com·612w

Ruby: Create and share Google Drive Spreadsheet

markhneedham.com·612w

Ruby: Receive JSON in request body

markhneedham.com·613w

Ruby: Google Drive - Error=BadAuthentication (GoogleDrive::AuthenticationError) Info=InvalidSecondFactor

markhneedham.com·613w

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