How to update data on each iteration

[Raj]

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Hi,
I am using random forest method to predict some response variable. My train test is 70% of input data and test data is 30%. But for prediction of 30% data, I want to add to each ith row in to train set after each iteration of prediction as described below:
for example
My Input data
1
2
3
4
5
6
7
8
9
10


My train-set(initially): test set
1
2
3
4
5
6
7



My test set
8
9
10

after I predict for 8th row (first prediction, the trainset will update to 1~8, and when I predict 9th row, the trainset will update to 1~9, and so on

[Larz60+]

please show code so far