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m(Range(i1,i2),Range(j1,j2))
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randShuffle(...)
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Mat imgroi = image(Rect(10, 20, 100, 100));
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A.row(j).copyTo(A.row(i));
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Rect r(1, 1, 10, 20);
Mat dstroi = dst(Rect(0,10,r.width,r.height));
src(r).convertTo(dstroi, dstroi.type(), 1, 0);
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scaleAdd(), transpose(), gemm(), invert(), solve(), determinant(), trace(), eigen(), SVD
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