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string([ format,] arg [, …, /skip_undefined])
string, arg [, …]
With more than one argument, function string is a synonym of
fstring. If only a single argument is specified, then this
argument may be a string, string array, or scalar. With a scalar
argument, function string transforms the argument to an ascii
string under guidance of the appropriate standard format
(!format_c, !format_i or !format_f, and removes
initial whitespace. With a string array argument, function
string returns a copy transformed to a single continuous string,
stringing all elements of arg together. With a string
argument, function string just returns that (i.e., does nothing).
The subroutine form converts its arguments to text strings; scalars (real or complex) are transformed to strings, and arrays (real or complex) are transformed to string arrays.
In the future, the behavior of the one-argument string function
will be made compatible with the string subroutine.