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This section describes how to change the position of an existing marker. When you do this, be sure you know whether the marker is used outside of your program, and, if so, what effects will result from moving it--otherwise, confusing things may happen in other parts of Emacs.
If position is less than 1,
set-marker moves marker
to the beginning of the buffer. If position is greater than the
size of the buffer,
set-marker moves marker to the end of the
buffer. If position is
nil or a marker that points
nowhere, then marker is set to point nowhere.
The value returned is marker.
(setq m (point-marker)) => #<marker at 4714 in markers.texi> (set-marker m 55) => #<marker at 55 in markers.texi> (setq b (get-buffer "foo")) => #<buffer foo> (set-marker m 0 b) => #<marker at 1 in foo>
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