R: Check the Sign of a Number

grade.negative {grade}

R Documentation

Check the Sign of a Number

Sees if studentans is negative, correctans is ignored.

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

`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.

TRUE if (studentans < -tolerance) FALSE otherwise.

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

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

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

[Package grade version 0.2-1 Index]