function nint, x, LONG = long ;Nearest Integer Function ;+ ; NAME: ; NINT ; PURPOSE: ; Nearest integer function. ; EXPLANATION: ; NINT() is similar to the intrinsic ROUND function, with the following ; two differences: ; (1) if no absolute value exceeds 32767, then the array is returned as ; as a type INTEGER instead of LONG ; (2) NINT will work on strings, e.g. print,nint(['3.4','-0.9']) will ; give [3,-1], whereas ROUND() gives an error message ; ; CALLING SEQUENCE: ; result = nint( x, [ /LONG] ) ; ; INPUT: ; X - An IDL variable, scalar or vector, usually floating or double ; Unless the LONG keyword is set, X must be between -32767.5 and ; 32767.5 to avoid integer overflow ; ; OUTPUT ; RESULT - Nearest integer to X ; ; OPTIONAL KEYWORD INPUT: ; LONG - If this keyword is set and non-zero, then the result of NINT ; is of type LONG. Otherwise, the result is of type LONG if ; any absolute values exceed 32767, and type INTEGER if all ; all absolute values are less than 32767. ; EXAMPLE: ; If X = [-0.9,-0.1,0.1,0.9] then NINT(X) = [-1,0,0,1] ; ; PROCEDURE CALL: ; None: ; REVISION HISTORY: ; Written W. Landsman January 1989 ; Added LONG keyword November 1991 ; Use ROUND if since V3.1.0 June 1993 ; Always start with ROUND function April 1995 ; Return LONG values, if some input value exceed 32767 ; and accept string values February 1998 ; Use size(/TNAME) instead of DATATYPE() October 2001 ;- xmax = max(x,min=xmin) xmax = abs(xmax) > abs(xmin) if (xmax gt 32767) or keyword_set(long) then begin if size(x,/TNAME) eq 'STRING' then b = round(float(x)) else b = round(x) end else begin if size(x,/TNAME) eq 'STRING' then b = fix(round(float(x))) else \$ b = fix(round(x)) endelse return, b end