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help for ^matchk^
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Check that argument is a matrix
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    ^matchk^ argname

Description
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^matchk^ checks that argname names an existing matrix. If not, an error
message will be issued.


Remarks
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^matchk^ is likely to be most useful within matrix programs.


Example
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    . ^matchk A^


Author
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         Nicholas J. Cox, University of Durham, U.K.
         n.j.cox@@durham.ac.uk