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Background The initial cases of novel coronavirus (19nCoV)infected pneumonia (NCIP) occurred in Wuhan, Hubei Province, China, in December 19 and January We analyzed data on the first 425 confirmed cases in Wuhan to determine the epidemiologic characteristics of NCIP Methods We collected information on demographic characteristics, exposure history, and illnessTh e n th e re e x ists a m a trix ,, A ~ l, th e in v e rse of m a trix A 9 su c h th a t A "1 1AI q j ij I in matrix form there is an orthogonal Qst Q 1AQ= QTAQ= I hence we can express s A= Q QT = i=1 iq iq T I in particular, q i are both left and right eigenvectors 3 Interpretations A= Q QT corresponds to x QT x QT x Ax QT linear mapping y= Axcan be decomposed as I resolve into q i coordinates I scale coordinates by i I Il Socrate Immaginario V Vm Mil Iy Voi Iri V Nlh I 4 O S Wlnoca Iaa Cx Tl Im Gv Iooa Bxju I R 33e Lt T Jttxt R 3ft Stzz Se Ax B A 'jÌq q _"X "¯^