text_expand

<code>text_expand</code> is simple string interpolation function. It searches in its
arguments expressions in curly brackets <code>{expr}</code>, evaluate them and substitute with
the result of evaluation. See examples.

Provides pipe-style interface for 'data.table'. Package preserves all 'data.table' features without
significant impact on performance. 'let' and 'take' functions are simplified interfaces for most common data
manipulation tasks. For example, you can write 'take(mtcars, mean(mpg), by = am)' for aggregation or
'let(mtcars, hp_wt = hp/wt, hp_wt_mpg = hp_wt/mpg)' for modification. Use 'take_if/let_if' for conditional
aggregation/modification. Additionally there are some conveniences such as automatic 'data.frame'
conversion to 'data.table'.

Gregory Demin

maditr

Fast Data Aggregation, Modification, and Filtering with Pipes
and 'data.table'

text_expand function

<dl><dt>...</dt>
<dd>character vectors</dd>
<dt>delim</dt>
<dd>character vector of length 2 - pair of opening and closing
delimiters for the templating tags. By default it is curly brackets. Note
that <code>delim</code> will be used in the perl-style regular expression so you
need to escape special characters, e. g. use "\\{" instead of
"{".</dd></dl>

Arguments

Evaluate expressions in curly brackets inside strings — text_expand

<dl>

<dt>...</dt>
<dd>character vectors</dd>


<dt>delim</dt>
<dd>character vector of length 2 - pair of opening and closing
delimiters for the templating tags. By default it is curly brackets. Note
that <code>delim</code> will be used in the perl-style regular expression so you
need to escape special characters, e. g. use "\\{" instead of
"{".</dd>

</dl>

text_expand: Evaluate expressions in curly brackets inside strings

Description

Usage

Value

Arguments

Examples