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whattype - query the basic data type of an expression
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Calling Sequence
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whattype(expr)
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Description
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The whattype(expr) function returns the data type name of expr, which may be any of the following basic data types:
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`*`
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`+`
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`.`
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`..`
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`::`
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`<`
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`<=`
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`<>`
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`=`
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`^`
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`||`
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`and`
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Array
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complex
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complex(extended_numeric)
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exprseq
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extended_numeric
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float
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fraction
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function
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hfarray
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implies
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indexed
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integer
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list
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module
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moduledefinition
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`not`
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`or`
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procedure
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series
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set
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string
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symbol
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table
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uneval
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unknown
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`xor`
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zppoly
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Matrix
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SDMPolynom
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Vector[column]
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Vector[row]
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Although exprseq is not a type name known to the type function, it is the name of the internal data structure for expression sequences.
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For a general expression, whattype returns the ``top level'' data type as determined by the order of precedence of the operators.
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Examples
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![whattype([x, y, z])](/support/helpjp/helpview.aspx?si=4555/file00601/math272.png)
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![M := rtable([[1, 2], [3, 4]])](/support/helpjp/helpview.aspx?si=4555/file00601/math315.png)
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![M := Array([[1, 2], [3, 4]])](/support/helpjp/helpview.aspx?si=4555/file00601/math318.png)
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![N := Matrix([[1, 2], [3, 4]])](/support/helpjp/helpview.aspx?si=4555/file00601/math329.png)
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![N := Matrix([[1, 2], [3, 4]])](/support/helpjp/helpview.aspx?si=4555/file00601/math332.png)
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