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Add code snippets for new methods
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doc/snippets/Cwise_arg.cpp
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doc/snippets/Cwise_arg.cpp
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ArrayXcf v = ArrayXcf::Random(3);
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cout << v << endl << endl;
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cout << arg(v) << endl;
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doc/snippets/Cwise_ceil.cpp
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doc/snippets/Cwise_ceil.cpp
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ArrayXd v = ArrayXd::LinSpaced(7,-2,2);
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cout << v << endl << endl;
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cout << ceil(v) << endl;
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doc/snippets/Cwise_cosh.cpp
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doc/snippets/Cwise_cosh.cpp
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ArrayXd v = ArrayXd::LinSpaced(5,0,1);
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cout << cosh(v) << endl;
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doc/snippets/Cwise_floor.cpp
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doc/snippets/Cwise_floor.cpp
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ArrayXd v = ArrayXd::LinSpaced(7,-2,2);
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cout << v << endl << endl;
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cout << floor(v) << endl;
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doc/snippets/Cwise_isNaN.cpp
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doc/snippets/Cwise_isNaN.cpp
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Array3d v(1,2,3);
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v(1) *= 0.0/0.0;
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v(2) /= 0.0;
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cout << v << endl << endl;
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cout << isNaN(v) << endl;
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doc/snippets/Cwise_isinf.cpp
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doc/snippets/Cwise_isinf.cpp
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Array3d v(1,2,3);
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v(1) *= 0.0/0.0;
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v(2) /= 0.0;
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cout << v << endl << endl;
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cout << isinf(v) << endl;
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doc/snippets/Cwise_log10.cpp
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doc/snippets/Cwise_log10.cpp
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Array4d v(-1,0,1,2);
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cout << log10(v) << endl;
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doc/snippets/Cwise_round.cpp
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doc/snippets/Cwise_round.cpp
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ArrayXd v = ArrayXd::LinSpaced(7,-2,2);
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cout << v << endl << endl;
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cout << round(v) << endl;
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doc/snippets/Cwise_sinh.cpp
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doc/snippets/Cwise_sinh.cpp
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ArrayXd v = ArrayXd::LinSpaced(5,0,1);
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cout << sinh(v) << endl;
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doc/snippets/Cwise_tanh.cpp
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doc/snippets/Cwise_tanh.cpp
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ArrayXd v = ArrayXd::LinSpaced(5,0,1);
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cout << tanh(v) << endl;
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