Canonicals.json

[{"question": "https://stackoverflow.com/questions/3099219/plot-with-2-y-axes-one-y-axis-on-the-left-and-another-y-axis-on-the-right", "tags": ["r", "ggplot2"], "title": "Plot with 2 y axes, one y axis on the left, and another y axis on the right", "desc": "I need to plot a bar chart showing counts and a line chart showing rate all in one chart, I can do both of them separately, but when I put them together, I scale of the first layer (i.e. the geom_bar) is overlapped by the second layer (i.e. the geom_line).", "score": 140}, {"question": "https://stackoverflow.com/questions/21982987/mean-per-group-in-a-data-frame", "tags": ["r", "aggregate"], "title": "Mean per group in a data.frame", "desc": "I have a data.frame and I need to calculate the mean per group (i.e. per Month, below).", "score": 91}, {"question": "https://stackoverflow.com/questions/9617348/reshape-three-column-data-frame-to-matrix-long-to-wide-format", "tags": ["r", "matrix", "dataframe", "plyr", "reshape"], "title": "Reshape three column data frame to matrix (&quot;long&quot; to &quot;wide&quot; format)", "desc": "I have a data.frame that looks like this. [...] I want this in matrix form so I can feed it to heatmap to make a plot. The result should look something like:", "score": 90}, {"question": "https://stackoverflow.com/questions/16573995/subset-by-group-with-data-table", "tags": ["r", "data.table", "greatest-n-per-group"], "title": "Subset by group with data.table", "desc": "Assume I have a data table containing some baseball players: [...] For each player (given by id), I want to find the row corresponding to the year in which they played the most games.", "score": 42}, {"question": "https://stackoverflow.com/questions/16443260/interleave-lists-in-r", "tags": ["r"], "title": "Interleave lists in R", "desc": "Let's say that I have two lists in R, not necessarily of equal length, What is the best way to construct a list of interleaved elements where, once the element of the shorter list had been added, the remaining elements of the longer list are append at the end?", "score": 23}, {"question": "https://stackoverflow.com/questions/1299871/how-to-join-merge-data-frames-inner-outer-left-right", "tags": ["r", "join", "merge", "dataframe", "r-faq"], "title": "How to join (merge) data frames (inner, outer, left, right)?", "desc": "Given two data frames How can I do database style, i.e., sql style, joins? ", "score": 812}, {"question": "https://stackoverflow.com/questions/5890584/how-to-reshape-data-from-long-to-wide-format", "tags": ["r", "reshape", "r-faq"], "title": "How to reshape data from long to wide format?", "desc": "I want to reshape it so that each unique \"name\" variable is a rowname, with the \"values\" as observations along that row and the \"numbers\" as colnames. Sort of like this:", "score": 141}, {"question": "https://stackoverflow.com/questions/2185252/reshaping-data-frame-from-wide-to-long-format", "tags": ["r", "dataframe", "reshape", "r-faq"], "title": "Reshaping data.frame from wide to long format", "desc": "I want to transform wide into a long data.frame ", "score": 72}, {"question": "https://stackoverflow.com/questions/9508518/why-are-these-numbers-not-equal", "tags": ["r", "floating-point", "floating-accuracy", "r-faq"], "title": "Why are these numbers not equal?", "desc": "floating point error", "score": 189}, {"question": "https://stackoverflow.com/questions/1660124/how-to-sum-a-variable-by-group", "tags": ["r", "sorting", "r-faq"], "title": "How to sum a variable by group?", "desc": "I want to sort the data by Category and sum the Frequencies:", "score": 189}, {"question": "https://stackoverflow.com/questions/3505701/grouping-functions-tapply-by-aggregate-and-the-apply-family", "tags": ["r", "sapply", "tapply", "r-faq"], "title": "Grouping functions (tapply, by, aggregate) and the *apply family", "desc": "I've never quite understood the differences between them, so I often just go through them all until I get what I want. Can someone explain how to use which one when?", "score": 835}, {"question": "https://stackoverflow.com/questions/9809166/count-number-of-rows-within-each-group", "tags": ["r", "dataframe", "r-faq"], "title": "Count number of rows within each group", "desc": "", "score": 59}, {"question": "https://stackoverflow.com/questions/7450600/count-number-of-observations-rows-per-group-and-add-result-to-data-frame", "tags": ["r", "dataframe", "aggregate", "plyr"], "title": "Count number of observations/rows per group and add result to data frame", "desc": "", "score": 31}, {"question": "https://stackoverflow.com/questions/12840294/counting-unique-distinct-values-by-group-in-a-data-frame", "tags": ["r", "dataframe", "distinct-values", "r-faq"], "title": "Counting unique / distinct values by group in a data frame", "desc": "", "score": 31}, {"question": "https://stackoverflow.com/questions/17421776/how-to-add-count-of-unique-values-by-group-to-r-data-frame", "tags": ["r", "count", "unique", "aggregate"], "title": "How to add count of unique values by group to R data.frame", "desc": "", "score": 31}, {"question": "https://stackoverflow.com/questions/13773770/split-comma-separated-column-into-separate-rows", "tags": ["r", "string", "split", "r-faq"], "title": "Split comma-separated column into separate rows", "desc": "", "score": 44}, {"question": "https://stackoverflow.com/questions/25211465/what-is-the-difference-between-and-in-magrittr", "tags": ["r", "piping", "magrittr"], "title": "What is the difference between %&gt;% and %,% in magrittr?", "desc": "Github developmental version of magrittr includes some cool new function for piping but I do not exactly catch de difference between %>% and %,%. Is this only formal with %>% for value and %,% for functions, or there is some specific peculiarity?", "score": 14}, {"question": "https://stackoverflow.com/questions/24536154/what-does-mean-in-r", "tags": ["r", "magrittr"], "title": "What does %&gt;% mean in R", "desc": "", "score": 33}, {"question": "https://stackoverflow.com/questions/4350440/split-a-column-of-a-data-frame-to-multiple-columns", "tags": ["r", "string", "dataframe", "split", "r-faq"], "title": "Split a column of a data frame to multiple columns", "desc": "", "score": 121}, {"question": "https://stackoverflow.com/questions/7069076/split-column-at-delimiter-in-data-frame", "tags": ["r", "dataframe"], "title": "Split column at delimiter in data frame", "desc": "Split column in multiple columns.", "score": 65}, {"question": "https://stackoverflow.com/questions/16596515/aggregating-by-unique-identifier-and-concatenating-related-values-into-a-string", "tags": ["r", "concatenation", "aggregate", "r-faq"], "title": "Aggregating by unique identifier and concatenating related values into a string", "desc": "", "score": 40}, {"question": "https://stackoverflow.com/questions/15933958/collapse-concatenate-aggregate-a-column-to-a-single-comma-separated-string-w", "tags": ["r", "aggregate", "plyr", "r-faq"], "title": "Collapse / concatenate / aggregate a column to a single comma separated string within each group", "desc": "", "score": 23}, {"question": "https://stackoverflow.com/questions/19226816/how-can-i-view-the-source-code-for-a-function", "tags": ["r", "function", "r-faq"], "title": "How can I view the source code for a function?", "desc": "", "score": 358}, {"question": "https://stackoverflow.com/questions/1741820/assignment-operators-in-r-and", "tags": ["r", "assignment-operator", "r-faq"], "title": "Assignment operators in R: &#39;=&#39; and &#39;&lt;-&#39;", "desc": "What are differences in the assignment operators = and <- in R ", "score": 467}, {"question": "https://stackoverflow.com/questions/12925063/numbering-rows-within-groups-in-a-data-frame", "tags": ["r", "dataframe", "r-faq"], "title": "Numbering rows within groups in a data frame", "desc": "How to add a counter variable by group.", "score": 64}, {"question": "https://stackoverflow.com/questions/15072955/as-date-with-dates-in-format-m-d-y-in-r", "tags": ["r", "date", "r-faq"], "title": "as.Date with dates in format m/d/y in R", "desc": "Converting numeric dates.", "score": 3}, {"question": "https://stackoverflow.com/questions/15566875/as-date-returning-na-while-converting-from-ddmmmyyyy", "tags": ["r", "date", "r-faq"], "title": "as.Date returning NA while converting from &#39;ddmmmyyyy&#39;", "desc": "Converting dates with month abbreviations.", "score": 11}, {"question": "https://stackoverflow.com/questions/6242955/converting-year-and-month-yyyy-mm-format-to-a-date", "tags": ["r", "date", "posix", "zoo", "r-faq"], "title": "Converting year and month (&quot;yyyy-mm&quot; format) to a date?", "desc": "Reading dates only consisting of year-month pairs.", "score": 57}, {"question": "https://stackoverflow.com/questions/12064202/using-aggregate-to-apply-several-functions-on-several-variables-in-one-call", "tags": ["r", "aggregate"], "title": "Using aggregate to apply several functions on several variables in one call", "desc": "", "score": 59}, {"question": "https://stackoverflow.com/questions/15215076/multiple-functions-in-a-single-tapply-or-aggregate-statement", "tags": ["r", "aggregate", "tapply"], "title": "Multiple functions in a single tapply or aggregate statement", "desc": "", "score": 12}, {"question": "https://stackoverflow.com/questions/20204257/subset-data-frame-based-on-number-of-rows-per-group", "tags": ["r", "dataframe", "subset", "r-faq"], "title": "Subset data frame based on number of rows per group", "desc": "", "score": 12}, {"question": "https://stackoverflow.com/questions/2315601/understanding-the-order-function", "tags": ["r", "order"], "title": "Understanding the order() function", "desc": "I wanted ranks and I find `order` does not work as expected.", "score": 58}, {"question": "https://stackoverflow.com/questions/9723208/aggregate-summarize-multiple-variables-per-group-i-e-sum-mean-etc", "tags": ["r", "dataframe", "data.table", "aggregate", "r-faq"], "title": "Aggregate / summarize multiple variables per group (i.e. sum, mean, etc)", "desc": "", "score": 92}, {"question": "https://stackoverflow.com/questions/11612235/select-rows-from-a-data-frame-based-on-values-in-a-vector", "tags": ["r", "subset", "r-faq"], "title": "Select rows from a data frame based on values in a vector", "desc": ": subsetting by comparing to values in a vector.", "score": 28}, {"question": "https://stackoverflow.com/questions/43197211/merge-with-replacement-based-on-multiple-non-unique-columns", "tags": ["r", "merge", "data.table", "dplyr"], "title": "Merge with replacement based on multiple non-unique columns", "desc": "update join based on multicolumn key, not specific to a particular package", "score": 3}, {"question": "https://stackoverflow.com/questions/12466493/reshaping-multiple-sets-of-measurement-columns-wide-format-into-single-columns", "tags": ["r", "reshape", "tidyr", "reshape2", "r-faq"], "title": "Reshaping multiple sets of measurement columns (wide format) into single columns (long format)", "desc": "", "score": 18}, {"question": "https://stackoverflow.com/questions/7854433/finding-all-duplicate-rows-including-elements-with-smaller-subscripts", "tags": ["r", "r-faq"], "title": "Finding ALL duplicate rows, including &quot;elements with smaller subscripts&quot;", "desc": "", "score": 62}, {"question": "https://stackoverflow.com/questions/9809166/count-number-of-rows-within-each-group", "tags": ["r", "dataframe", "r-faq"], "title": "Count number of rows within each group", "desc": "", "score": 59}, {"question": "https://stackoverflow.com/questions/6112260/conditional-merge-replacement-in-r", "tags": ["r", "match", "r-faq"], "title": "Conditional merge/replacement in R", "desc": "a simple update join", "score": 10}, {"question": "https://stackoverflow.com/questions/11952706/generate-a-dummy-variable", "tags": ["r", "r-faq"], "title": "Generate a dummy-variable", "desc": "", "score": 37}, {"question": "https://stackoverflow.com/questions/46711824/how-to-process-and-combine-data-frames-in-a-list-with-faster-way", "tags": ["r", "list", "dataframe", "dplyr", "data.table"], "title": "How to process and combine data.frames in a list with faster way", "desc": "read in and stack similar files with rbindlist or bind_rows", "score": 2}, {"question": "https://stackoverflow.com/questions/37835592/remove-groups-with-less-than-three-unique-observations", "tags": ["r", "subset", "r-faq"], "title": "Remove groups with less than three unique observations", "desc": "", "score": 3}]