gnuplot - How to add points at intervals -

i add points graph @ every 100 interval shown in graph. have used line in gnuplot, error "every" unrecognized token. using gnuplot v5. how can add point @ interval of 100 in graph?

set xtics 100 set yrange [ 0 : 3000 ] noreverse nowriteback plot [x=100:1000] x every 100 

every can used data files, not functions. simplest solution set number of samples:

set xrange [100:1000] set samples 10 plot x points