| verbalogic {spatstat.utils} | R Documentation |
Verbal Logic
Description
Perform the specified logical operation
on the character vector x, recognising the
special strings "TRUE" and "FALSE"
and treating other strings as logical variables.
Usage
verbalogic(x, op = "and")
Arguments
x |
Character vector. |
op |
Logical operation: one of the character strings
|
Details
This function performs simple logical operations on character strings that represent human-readable statements.
The character vector x may contain any strings:
the special strings "TRUE" and "FALSE" are
treated as the logical values TRUE and FALSE,
while all other strings are treated as if they were
logical variables.
If op="and", the result is a single string,
logically equivalent to x[1] && x[2] && ... && x[n].
First, any entries of x equal to "TRUE" are removed.
The result is "FALSE" if any of the entries of x
is "FALSE"; otherwise it is equivalent to
paste(x, collapse=" and ").
If op="or", the result is a single string, logically equivalent to
x[1] || x[2] || ... || x[n].
First, any entries of x equal to "FALSE" are removed.
The result is "TRUE" if any of the entries of x
is "TRUE"; otherwise it is equivalent to
paste(x, collapse=" or ").
If op="not", the result is a character vector y
such that y[i] is the logical negation of x[i].
The code does not understand English grammar and cannot expand logical expressions.
Value
A character string.
Author(s)
Adrian Baddeley Adrian.Baddeley@curtin.edu.au.
Examples
x <- c("The sky is blue", "my name is not Einstein", "FALSE")
verbalogic(x, "and")
verbalogic(x, "or")
verbalogic(x, "not")