Merge pull request #2578 from jmoenig/bar-chart-library

bar chart library

libraries/LIBRARIES

@@ -4,6 +4,7 @@ stream-tools.xml	Streams (lazy lists)	A variation on the list data type in which
 variadic-reporters.xml	Variadic reporters	Versions of +, x, AND, and OR that take more than two inputs.
 httpBlocks.xml	Web services access (https)	An extended version of the HTTP:// block that allows POST, PUT, and DELETE as well as GET requests, allows using the secure HTTPS protocol, and gives control over headers, etc.
 word-sentence.xml	Words, sentences	One of the big ideas in Logo that they left out of Scratch is thinking of text as structured into words and sentences, rather than just a string of characters.  This library brings back that idea.
+bar-charts.xml	Bar charts from tables	Takes a table (typically from a CSV data set) as input and reports a summary of the table grouped by the field in the specified column number.  The remaining three inputs are used only if the field values are numbers, in which case they can be grouped into buckets (e.g., decades, centuries, etc.).  Those three inputs specify the smallest and largest values of interest and, most importantly, the width of a bucket (10 for decades, 100 for centuries).  If the field isn't numeric, leave these three inputs empty or set them to zero.  In that case, each string value of the field is its own bucket, and they appear sorted alphabetically.  The block reports a new table with three columns.  The first column contains the bucket name or smallest number.  The second column contains a nonnegative integer that says how many records in the input table fall into this bucket.  The third column is a subtable containing the actual records from the original table that fall into the bucket.  If your buckets aren't of constant width, or you want to group by some function of more than one field, load the "Frequency Distribution Analysis" library instead. 
 cases.xml	Multi-branched conditional (switch)	Like "switch" in C-like languages or "cond" in Lisp.  Thanks to Nathan Dinsmore for inventing the idea of a separate block for each branch!
 leap-library.xml	LEAP Motion controller	Report hand positions from LEAP Motion controller (leapmotion.com).
 textCostumes_module.xml	Text Costumes	Generate costumes from letters or words of text.