[R] sum some columns for each row

[Jeff Newmiller]

Please read the Posting Guide before posting again. Pay particular attention to the guidance to post using plain text. Also use the dput function to provide your sample data so we can more accurately start from where you are starting bad give more targeted answers.

You can use indexing to select the subset of columns to work with, and the rowSums function to do the calculations. Something like

dta$abc <- rowSums( dta[ , grep( "abc", names( dta ) ) ] )

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Sent from my phone. Please excuse my brevity.

On July 9, 2015 10:12:30 AM PDT, Dawn <dawn1313 at gmail.com> wrote:
>Hi,
>
>I have a big dataframe as follows
>
> 109ABC    109XYZ    18ABC    18XYZ    22XYZ    23ABC    25ABC    25XYZ
>   30ABC    31XYZ    32ABC    32XYZ    34DCM    34XYZ    36ABC    36SUR
>38DCM    38XYZ    39DCM    39SUR    41DCM    41SUR    42DCM    42SUR
>46SUR    52DCM    64ABC    64XYZ    65ABC    65XYZ    66ABC    66XYZ
>67XYZ    68ABC    68SUR    70MES    70SUR    72ABC    72XYZ    76ABC
>76XYZ    82ABC    85ABC    POV
>Cluster_1                                                        17   
>1
>3    10    14    5    2    2        1    1    1    2
>                        2                            TT:61
>Cluster_2                    1                                4    20
>6    5    3    6    9    9    6        10        1    3    1
>                            4                            TT:88
>Cluster_3    3        3                            6        4        17
>17    18    13    17    19    22    11    5    21    8    5    18    4
>7                                        9                           
>TT:227
>........
>
>I want to get two columns, i.e,  one is to sum columns for all
>including
>ABC for each row and the other is  to sum columns for all including XYZ
>for
>each row.
>
>Is there some help? Thank you!
>Dawn
>
>	[[alternative HTML version deleted]]
>
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