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type/listlist - Check for a list of lists
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Calling Sequence
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type(expr, listlist)
type(expr, listlist(K))
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Parameters
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expr
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any expression
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K
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-
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type name
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Description
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The function type/listlist returns true if expr is a nonempty list of lists, with each inner list having the same number of elements. Otherwise, it returns false.
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If a type is given, then an additional check will be made to ensure that all the operands of the inner lists are of the given type.
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Examples
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![type([], 'listlist')](/support/helpjp/helpview.aspx?si=4602/file04625/math69.png)
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| (1) |
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![type([[1, 2], [3, 4]], 'listlist')](/support/helpjp/helpview.aspx?si=4602/file04625/math76.png)
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| (2) |
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![type([[1, 2], [3, 4]], 'listlist(integer)')](/support/helpjp/helpview.aspx?si=4602/file04625/math83.png)
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| (3) |
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![type([8, 7, 6, 12], 'listlist')](/support/helpjp/helpview.aspx?si=4602/file04625/math90.png)
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| (4) |
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![type([[1, 2], [3, 4, 5]], 'listlist')](/support/helpjp/helpview.aspx?si=4602/file04625/math97.png)
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| (5) |
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![type([[]], 'listlist')](/support/helpjp/helpview.aspx?si=4602/file04625/math104.png)
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| (6) |
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![type([[[a], [b]], [[c], [d]]], 'listlist')](/support/helpjp/helpview.aspx?si=4602/file04625/math111.png)
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| (7) |
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![type([[[a], [b]], [[c], [d]]], 'listlist(integer)')](/support/helpjp/helpview.aspx?si=4602/file04625/math118.png)
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| (8) |
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