Returns True for every element of the input that is a defined variable.
function isvar ( varnames : string ) return_val [dimsizes(varnames)] : logical
An array of strings of any dimensionality.
For each element in the varnames list, isvar returns True if the element is a defined variable and False otherwise. The output of isvar is a logical array with the same dimensions as varnames.
In the NCL script below, isvars will be equal to (/True, False, True/):
x = 1.5 title = "Temperature" isvars = isvar((/"x","z","title"/))