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Student Support Forum: 'Package Trouble' topicStudent Support Forum > General > "Package Trouble"

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Jerry Easley
10/07/98 9:24pm

When I load some packages I get enigmatic warning messages. For instanc;

<<DiscreteMath`ZTransform`
ZTransform[Sin[n], n, z]
InverseZTransform[%, z, n] // Together

I get the following warning messages:


ZTransform::''shdw'':
''Symbol \!\(\''ZTransform\''\) appears in multiple contexts \
\!\({\''DiscreteMath`ZTransform`\'', \''Global`\''}\); definitions in context \
\!\(\''DiscreteMath`ZTransform`\''\) may shadow or be shadowed by other \
definitions.''

and

InverseZTransform::''shdw'':
''Symbol \!\(\''InverseZTransform\''\) appears in multiple contexts \
\!\({\''DiscreteMath`ZTransform`\'', \''Global`\''}\); definitions in context \
\!\(\''DiscreteMath`ZTransform`\''\) may shadow or be shadowed by other \
definitions.''

The functions then don't work; I get output as follows:

Null ZTransform[Sin[n],n,z]
and
InverseZTransform[Null ZTransform[Sin[n],n,z],z,n]

Does anybody know how to fix this or why it happens?

Regards,
Jerry


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Subject (listing for 'Package Trouble')
Author Date Posted
Package Trouble Jerry Easley 10/07/98 9:24pm
Re: Package Trouble Forum Modera... 10/08/98 3:28pm
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