grade.negative: Check the Sign of a Number

In grade: Binary Grading functions for R.

Description

Sees if studentans is negative, correctans is ignored.

Usage

grade.negative(correctans=NULL, studentans, tolerance=0.01,
               useeval=TRUE, usena=FALSE, useinf=FALSE, quiet=TRUE)

Arguments

correctans	not used in this function, no restrictions are enforced.
studentans	a vector of type numeric or a string
tolerance	a string or numeric representing the accepted component wise tolerance
useeval	TRUE or FALSE indicates whether or not to use 'eval' on strings
usena	TRUE or FALSE indicating whether or not NA is an accepted value
useinf	TRUE or FALSE indicating whether or not Inf and -Inf are accepted values
quiet	TRUE or FALSE. If TRUE there are more warning messages when checks fail. Can be helpful for debugging.

Value

TRUE if (studentans < -tolerance) FALSE otherwise.

Note

The grade main page contains a discussion of the common parameters correctans, studentans, useeval, usena, useinf, quiet.

See Also

grade grade.set grade.number

Examples

grade.negative(studentans=0, "1") # FALSE
grade.negative(NULL, "1.1", tolerance=".01") # FALSE

grade.negative("soup", "-.1", tolerance=.05) # TRUE

grade documentation built on May 2, 2019, 9:15 a.m.