where {tractor.base}

Compact conditional values

Description

This simple function checks whether its first argument is a logical value that evaluates to TRUE. If so, it returns its second argument. If not, it returns its third argument.

Usage

where(condition, value, fallback = NULL)

Arguments

condition

An expression that resolves to a single logical value.

value, fallback

Any expression.

Details

This function differs from the standard ifelse function in that it does not act elementwise, and that the third argument is optional, defaulting to NULL.

Value

value, if condition evaluates to TRUE; otherwise fallback.

Author(s)

Jon Clayden

References

Please cite the following reference when using TractoR in your work:

J.D. Clayden, S. Muñoz Maniega, A.J. Storkey, M.D. King, M.E. Bastin & C.A. Clark (2011). TractoR: Magnetic resonance imaging and tractography with R. Journal of Statistical Software 44(8):1-18. doi:10.18637/jss.v044.i08.

See Also

ifelse