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. For this to work properly, the
     arguments '...' should be unnamed, and dispatch is on the first
     argument.

     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. For
     historical reasons, 'NULL' is accepted and treated as if it were
     'integer(0)'.

_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.  Otherwise it is a length-one
     numeric or complex vector.

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

_S_4 _m_e_t_h_o_d_s:

     This is part of the S4 'Summary' group generic.  Methods for it
     must use the signature 'x, ..., na.rm'.

     'plotmath' for the use of 'sum' in plot annotation.

_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.

_S_e_e _A_l_s_o:

     'colSums' for row and column sums.