interrelated concepts

parallel structure
Merge pull request #187 from lindbrook/patch-20

interrelated concepts
Update Package-quick-reference.rmd

When I setwd() to the R directory I got this error message:

> load_all();
No DESCRIPTION found. Creating with values:

Package: R
Title: 
Description: 
Version: 0.1
Authors@R: # getOptions('devtools.desc.author')
Depends: R (>= 3.0.2)
License: # getOptions('devtools.desc.license')
LazyData: true
Loading R
Invalid DESCRIPTION:
Authors@R field gives no person with author role.
Authors@R field gives no person with maintainer role and email address.

See the information on DESCRIPTION files in section 'Creating R packages' of the 'Writing R Extensions' manual.

Then when I moved up a directory (to the directory that has the DESCRIPTION file) it worked:

> setwd("..")
> load_all();
Loading choroplethr
Merge pull request #188 from arilamstein/patch-1

Update Package-quick-reference.rmd
Subsetting exercises

to -> from
Typo
Update Functions.rmd

fixed typo & grammar
Update Functionals.rmd

added redundant word to make sentence more clear:
the first *argument* to most functionals is ... but the first argument to 'Map()' is...
Update Functionals.rmd

clarified explanation of sweep() example code and changed code so it does what example describes.
Minor typo suggestion

On the rendered website, the console output for a code chunk (lines 439-445) should be

#> a + b + x

But is instead

#> 1 + 2 + mpg

I am not sure how to fix this, but wanted to point it out. Appears to be a quirk in how knitr converts .Rmd to .md, but I do not know enough about knitr internals to know for sure.
Update Functionals.rmd

changed order of arguments in "where" definition to match syntax of other predicate functionals.
changed predicate functional demo code example function to "is.factor" to make example more clear.
Update Functionals.rmd

...replacing it *with* specific references...
Why logical vectors are useful
with nothing
commas, etc
Merge pull request #195 from lindbrook/patch-23

with nothing
Merge pull request #192 from mjsduncan/master

Update Functionals.rmd
Merge pull request #191 from mjsduncan/patch-2

Update Functionals.rmd
Manually fixed output for R code chunk

Due to quirks in R's substitute() combined with how knitr converts .Rmd
to .md, the R output was "incorrect". So I changed {r} to {r, eval =
FALSE} and manually inserted the desired output as a comment.

Also: my prior commit incorrectly noted that lines 439-445 needed
changes. Should instead be lines 431-434.
Merge pull request #196 from lindbrook/patch-24

commas, etc