13 lines
467 B
C++
13 lines
467 B
C++
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Matrix2f M = Matrix2f::Random();
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Matrix2f m;
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m = M;
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cout << "Here is the matrix m:" << endl << m << endl;
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cout << "Now we want to copy a column into a row." << endl;
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cout << "If we do m.col(1) = m.row(0), then m becomes:" << endl;
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m.col(1) = m.row(0);
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cout << m << endl << "which is wrong!" << endl;
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cout << "Now let us instead do m.col(1) = m.row(0).eval(). Then m becomes" << endl;
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m = M;
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m.col(1) = m.row(0).eval();
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cout << m << endl << "which is right." << endl;
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