The older missing values too often fell into the range of normal calculationsĪnd led occasionally to occurrences of accidental equivalences of data or the results of calculations with the missing value.
The default missing values have changed in version 6.0.0. The array referenced by b which has -10.0 as its _FillValue. The element equal to -10.0 in the array is ignored, and the result is Next the value of -10.0 is assignedĪs the _FillValue attribute. In this example, the constant array (/ 27.2, -10.0/) isĪssigned to the variable a. They are ignored for the specific element that contains the missing When missing values appear in terms of an NCL expression, First and most important is how missing values are handled inĮxpressions. The _FillValue attribute has many important uses The variable that were treated as missing values are treated as normal Once removed, all of the previous elements of Same type as the data type referenced by the variable. Temperature, in the above example, is replaced with the new Whenever the _FillValue attribute is assignedĪ new value, every occurrence of the previous value in the variable That denotes what values stored in a variable should be considered The attribute _FillValue is a special reserved attribute name The variable named = "Degrees = "Temperature at = -9999.0Īttributes can be used in expressions and subscripted in the same fashion as variables.Ĭommon uses of attributes are to store the units that data are stored in,Īnd to store names and text that could be useful. The following are examples ofĬreating the attributes units, long_name, and _FillValue in Is created by referencing it on the left side of an assignment If the attribute is not defined, then an error message is displayed. The variable name, followed by followed by the name to be used to reference
Variable attributes are referenced by entering Information to the user about specific data.Īttributes can be assigned single-dimensioned arrays, but notįiles. The reference guide to distinguish between different kinds of variables.Īttributes are descriptive pieces of information that can be associated withĪn already existing variable, or file variable. These terms will be used throughout this section of Finally,īe a variable in a file that references a multi-dimensional data value. These variables provide references to open files. Second, there is the term variable that referencesĪ file, which is defined as a variable that is assigned the returnįunction. Is defined as a textual reference to a multi-dimensional or The first and most obvious is the term variable which There are three types of variables referenced in this document. Variables become defined when an undefined name appears on the Have a name associated with it and optionally a coordinate variable. Variables can have an unlimited number ofĪttributes assigned to them. These ancillary dataĪre divided up into three categories: variable attributes, dimensions,Īnd coordinates. NCL provides a unique syntax for storing and That allow ancillary information to be "attached" to a variable NCL has been designed with special features Languages, variables in NCL can be deleted, or changed from What type of value is assigned to it, not the name. Unlike Fortran though, the type of a variable is based on In NCL, somewhat like Fortran, variablesĬan be created without previously defining them. Variables, like in other programming languages, are textual names The following are examples of unique variable names: Variables canĪlso reference files and graphical objects. These data can be described by variableĪttributes, named dimensions, and coordinate variables. The oneĮxception to this rule is that the underscore ('_') is alsoĪllowed. Variable names must begin with an alphabetic character, but they canĬontain any mix of numeric and alphabetic characters. NCL Language Reference Guide: Variables Properties of variables
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