[R] rows process in DF

[jd6688]

I have the following datasets:

 id  d1  d2   d3   d4   d5   d6   d7   d8
1 100 0.3 0.4 -0.2 -0.3  0.5  0.6 -0.9 -0.8
2 101 0.3 0.4  0.5  0.6 -0.2 -0.4 -0.5 -0.6

what I am trying to accomplish:

 loop through the  rows && do the following:
    if the values from the columns of the current row >0 then
sum_positive=total
    if the values from the columns of the current row <0 then
sum_negtive=total

    then discard the columns and create a new table 


     id    sum_positive  sum_negtive

1  100      1.8           -2.2 
2   101     1.8           -1.7 

I tried the following:but didn't make it work, any inputs would be greatly
appreciated.

 for (i in 1:nrow(myDF))  { 
+    myrow <-myDF[i,] 
+   don't know how to move forward?
+ } 

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