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6 lines
270 B
C++
6 lines
270 B
C++
Matrix2d m; m << 1,2,3,4;
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cout << (m*m).lazy().row(0) << endl;
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// this computes only one row of the product. By contrast,
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// if we did "(m*m).row(0);" then m*m would first be evaluated into
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// a temporary, because the Product expression has the EvalBeforeNestingBit.
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