Hi,
I just started using R for about one week and I have few problems.
i)I have a problem in finding right function to convert a table of natural
numbers to bitwise. For a simple example;
I have the below table:-
Column Col1 Col2 Col3
Sample1 5 7 10
Sample2 0 2 1
Sample3 4 0 0
Supposedly i wanted to convert to :-
Column Col1 Col2 Col3
Sample1 1 1 1
Sample2 0 1 1
Sample3 1 0 0
ii)Besides, I would like to create a formula of Sum(3*(Element in each
column for a row))..does it equivalent to 3*(data[1:3,1:2]) in this case?or
I need to have Sum(3*(data[1:3,1:2])). Basically I wanted to mutliply each
element of column table of a row and sum it up.
iii)I would also like to know how to insert an if else statement where in
the above case, I wanted to check if data[1:3,]
returns me 1 or 0, it will execute some calculations.
I refer to the R intro pdf and it mentioned using if (expr_1 ) expr_2 else
expr_3. Does that mean if(data[1:3,1:2])>0 output[1:3,1:2]=0
else output[1:3,1:2]="100". If I did this command, how does R knows which
row and column to map the output with?
Please advise. Appreciate alot. Thanks.
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