They are named pretty descriptively...
R.anim.slide_left_in
will slide the view in from the left.
R.anim.slide_left_out
will slide the view out to the left.
Same thing for the right
ones but in the opposite direction.
EDIT:
R.anim.slide_left_out
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="false" >
<translate
android:duration="700"
android:fromXDelta="0%"
android:fromYDelta="0%"
android:toXDelta="-100%"
android:toYDelta="0%" />
</set>
The right out/in ones will be roughly the same as the left ones but with positive 100% instead of negative.