[R] print value of variable to screen or alert box?

[onyourmark]

I am trying to debug a loop. Is there a way to print the value of a variable
that is inside a loop? I have a vector v and inside a loop I have v[i] where
i is the index of the loop. Is there a way to see v[i] per loop so that I
can see what is going on?
Thanks
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