How do I set grid spacing in gnuplot

Question

I have yaxis from 0 to 100. I want a grid line after every 10 units. How can I do that? That is, how can I draw grid lines after each 10 units?

Answer 1

Have a look at "help grid", you probably want to do something like

set yrange [0:100]
set xrange [0:10]

set grid ytics mytics  # draw lines for each ytics and mytics
set mytics 2           # set the spacing for the mytics
set grid               # enable the grid

plot sin(x)*100

Answer 2

The ytics variable controls how often or sparse the y scale values will be printed and thus the grid lines will be drawn.

set ytics 10  # y scale marks and values will be at every 10th unit
set grid      # grid turned on at each scale values
replot        # replot your graph

The mytics controls the minor marks on the y scale. The set grid mytics makes the y scale minor grid lines visible.