sum                   package:base                   R Documentation

_S_u_m _o_f _V_e_c_t_o_r _E_l_e_m_e_n_t_s

_D_e_s_c_r_i_p_t_i_o_n:

     'sum' returns the sum of all the values present in its arguments.

_U_s_a_g_e:

     sum(..., na.rm = FALSE)

_A_r_g_u_m_e_n_t_s:

     ...: numeric or complex or logical vectors.

   na.rm: logical. Should missing values be removed?

_D_e_t_a_i_l_s:

     This is a generic function: methods can be defined for it directly
     or via the 'Summary' group generic.

     If 'na.rm' is 'FALSE' an 'NA' value in any of the arguments will
     cause a value of 'NA' to be returned, otherwise 'NA' values are
     ignored.

     Logical true values are regarded as one, false values as zero.

_V_a_l_u_e:

     The sum. If all of '...' are of type integer or logical, then the
     sum is integer, and in that case the result will be 'NA' (with a
     warning) if integer overflow occurs.

     *NB:* the sum of an empty set is (integer) zero, by definition.

_R_e_f_e_r_e_n_c_e_s:

     Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) _The New S
     Language_. Wadsworth & Brooks/Cole.

