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The way for loop is processed is as follows 1 First, initialization is performed (i=0) 2 the check is performed (i < n) 3 the code in the loop is executed. 4 the value is incremented 5 Repeat steps 2 - 4 This is the reason why, there is no difference between i++ and ++i in the for loop which has been used.
If you mean both in the sense of anticipating something, both are equally valid. However 'I look forward' is more formal; it's the kind of thing you would write in an official letter. A typical example is the closing statement of a cover letter for a job application: I look forward to hearing from you soon. 'I am looking forward' is less formal. You would rarely say to a friend on the phone 'I ...
The I() function acts to convert the argument to "as.is", i.e. what you expect. So I (x^2) would return a vector of values raised to the second power. The ~ should be thought of as saying "is distributed as" or "is dependent on" when seen in regression functions. The ~ is an infix function in its own right. You can see that LHS ~ RHS is almost shorthand for formula(LHS, RHS) by typing this at ...
In R formulas, why do I have to use the I () function on power terms ...
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