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MtxVec VCL
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VectorInt.Diag Method
VectorInt Record | VectorInt Members | MtxExprInt Namespace | public | Example | See Also
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Copies the k-th diagonal from the TMtxInt object.

Pascal
function Diag(const Mtx: TMtxInt; k: integer): TVecInt;
Description

Copies the k-th diagonal from the TMtxInt object. If k = 0 then the main diagonal is copied, if k < 0 then the subdiagonal is copied and if k > 0 then the k-th super diagonal is copied to the calling vector.

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Example

In the following example we setup a matrix, populate it with values and then extract it's main diagonal to a vector.

var a: TVecInt; d: TMtxInt; begin CreateIt(a); CreateIt(d); try // setup matrix d.SetIt(2,2,[1,-2, 3, 4]); // get main diagonal from matrix a.Diag(d,0); // a now containes [1,4]; finally FreeIt(a); FreeIt(d); end; end;
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