if statement - R - calculating values assigned to the same number -

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i have question regarding data:

data = 1   time    3 2    20 0 3    20 0 4    20 0 5   350 1 6   350 1 7   350 1 8   10  0 9   20  1 10  37  0 11  37  0 12  50  1 13  50  1 14  40  0 15  40  0 16  40  0

i want summarize time spent looking @ 1 (as indexed in column 3). time assigned total looking time when 1 looked @ - need summarize first time when 1 newly indicated - 350 + 20 + 50.

an if-loop like:

if (data$3 == 1) {   sum <- data[:,2] }

does not work, values summarized. need addresses first 1 after 0.

use ddply plyr package (mydata data , col3 column 3 in data name col3.

mydata

> mydata    col1 time col3 1     1   20    0 2     2   20    0 3     3   20    0 4     4  350    1 5     5  350    1 6     6  350    1 7     7   10    0 8     8   20    1 9     9   37    0 10   10   37    0 11   11   50    1 12   12   50    1 13   13   40    0 14   14   40    0 15   15   40    0  library(plyr) ddply(mydata,.(col3), summarize, mysum=sum(unique(time)))    col3 mysum 1    0   107 2    1   420

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