 Further Examples
This constructs a  x  matrix of integers.
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This picks out the third element in the second row.
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Here is the same operation using Part rather than Extract.
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This picks out the diagonal elements.
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This does the same thing with separate calls to Part.
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This picks out the element from the upper left corner of the matrix and the entire second row.
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This encloses the extracted elements with h.
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Here is the list of positions where powers appear in the polynomial poly.
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It is not necessary to name the blanks.
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This gives the powers.
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同时参见 the Further Examples for Part.
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