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is.finite
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_W_h_i_c_h _E_l_e_m_e_n_t_s _a_r_e _F_i_n_i_t_e?
is.finite(x)
_D_e_s_c_r_i_p_t_i_o_n:
is.finite returns a vector of the same length as x the
jth element of which is TRUE if the jth element of x is
finite.
At present, IEEE arithmetic is not supported and this
is simply the same as !is.na(x).