I
Function
Purpose Statement
Returns the integer ASCII value of a character argument.
Returns the ASCII value of a character converted to uppercase.
Computes the day of the week for a given date.
Retrieves the code for an informational error.
Checks if a floating‑point number is NaN (not a number).
Compares two character strings using the ASCII collating sequence without regard to case.
Determines the position in a string at which a given character sequence begins without regard to case.
Retrieves integer machine constants.
Performs an includance test.
Computes estimates of the impulse response weights and noise series of a univariate transfer function model.
Searches a sorted integer vector for a given integer and returns its index.