| Special Numeric Values |
The R language has four symbols that are used to represent special numerical values.
The symbol NA represents a missing value.
The symbol Inf represents positive infinity.
The symbol –Inf represents positive infinity.
The symbol NaN represents a "NaN," which is a floating-point value that represents an undefined value such as the result of the division
.
The SAS language has 28 symbols that are used to represent special numerical values.
The symbol . represents a generic missing value.
The symbols .A–.Z and ._ are also missing values. Some applications use .I to represent positive infinity and use .M to represent negative infinity.
The following table shows how special numeric values in R are converted to SAS missing values:
Value in R |
SAS Missing Value |
|---|---|
Inf |
.I |
–Inf |
.M |
NA |
. |
NaN |
. |
The following table shows how SAS missing values are converted when data are transferred to R:
SAS Missing Value |
Value in R |
|---|---|
.I |
Inf |
.M |
–Inf |
All others |
NA |