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linalg[submatrix] - extract a specified submatrix from a matrix
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Calling Sequence
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submatrix(A, Rrange, Crange)
submatrix(A, Rlist, Clist)
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Parameters
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A
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matrix
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Rrange, Crange
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integer ranges of rows/columns of A
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Rlist, Clist
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lists of integer row/column indices
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Description
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The call submatrix(A, Rrange, Crange) returns the submatrix of A selected by the row range Rrange and the column range Crange.
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The call submatrix(A, Rlist, Clist) returns the matrix whose (i,j)th element is A[Rlist[i], Clist[j]].
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These calling methods can be combined, so for instance the call submatrix(A, Rlist, Crange) is valid, and will return the submatrix of A with rows from Rlist and columns from Crange.
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The command with(linalg,submatrix) allows the use of the abbreviated form of this command.
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