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Given 2 absolute numbers (compatible with region-beginning, region-end).

How can these numbers be used to set the selection?

Edit: If you use evil mode you may want to check this question, at the time of asking I wasn't aware this required a different method in some cases.

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The region is defined as the span of text between point and mark, therefore it's sufficient to adjust both to the numbers in question. The following uses point-min and point-max for that purpose:

(set-mark (point-min)) (goto-char (point-max))

However you mention "set the selection" afterwards, so perhaps you don't only want to change the region (as there is always a region), but activate it as well:

(activate-mark)
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    Maybe worth mentioning that (setq deactivate-mark nil) may need to be set in some cases (as you found when looking into why setting selection sometimes fails). Commented Aug 15, 2017 at 2:03
  • Not really as activating the mark works, it's just that it's deactivated right afterwards. This is therefore material for a new question of the "Why is mark deactivated after a <...> command?" kind. Commented Aug 15, 2017 at 5:18

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