Adding Interactive Data Language (IDL) support.

samples/IDL/mg_trunc.pro

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+; docformat = 'rst'
+
+;+
+; Truncate argument towards 0.0, i.e., takes the `FLOOR` of positive values
+; and the `CEIL` of negative values.
+;
+; :Examples:
+;   Try the main-level program at the end of this file. It does::
+;
+;      IDL> print, mg_trunc([1.2, -1.2, 0.0])
+;                 1          -1           0
+;      IDL> print, floor([1.2, -1.2, 0.0])
+;                 1          -2           0
+;      IDL> print, ceil([1.2, -1.2, 0.0])
+;                 2          -1           0
+;
+; :Returns:
+;    array of same type as argument
+;
+; :Params:
+;    x : in, required, type=float/double
+;       array containing values to truncate
+;-
+function mg_trunc, x
+  compile_opt strictarr
+  
+  result = ceil(x)
+  posInd = where(x gt 0, nposInd)
+  
+  if (nposInd gt 0L) then begin
+    result[posInd] = floor(x[posInd])
+  endif
+  
+  return, result
+end
+
+
+; main-level example program
+
+print, mg_trunc([1.2, -1.2, 0.0])
+
+end