Position of tic marks in Gnuplot - gnuplot

Question

I am looking for a way to position tic marks in gnuplot between the axis, but so far I only found solution to put them in or out:
set tics in
puts all tic marks inside of the canvas
set tics out
puts all tic marks outide of the canvas
All I want is to place tic marks on both sides of the axis, somethink like
--l--l--
Thanks for a hint!

Answer 1

As said in the comments, it seems not possible to place the tics on both sides of the axis. A workaround would be to plot the axis twice, or to draw the tics by hand with the set arrow.
Drawing tics by hand:
Consider the following settings:
Xmin = -4.0 # range in x
Xmax = 4.0
Ymin = -1.2 # range in y
Ymax = 1.2
NXtics = 8 # number of Xtics
NYtics = 4 # number of Ytics
epsX = 0.05 # length of Xtics
epsY = 0.03 # length of Ytics
dX = (Xmax-Xmin)/NXtics # distance between Xtics
dY = (Ymax-Ymin)/NYtics # distance between Ytics
Next, we draw the bottom, top, left, and right tics:
# xtics and x2tics
do for [i=0:NXtics] {
posX = Xmin+i*dX
set arrow from posX,Ymin-epsY to posX,Ymin+epsY nohead front # bottom
set arrow from posX,Ymax-epsY to posX,Ymax+epsY nohead front # top
}
# ytics and y2tics
do for [i=0:NYtics] {
posY = Ymin+i*dY
set arrow from Xmin-epsX,posY to Xmin+epsX,posY nohead front # left
set arrow from Xmax-epsX,posY to Xmax+epsX,posY nohead front # right
}
Since you are drawing the tics by hand, you will need to configure the axis numbers and ranges:
set xtics Xmin,dX,Xmax scale 0 offset 0,-epsY
set ytics Ymin,dY,Ymax scale 0 offset -epsX,0
set xrange [XMIN:XMAX]
set yrange [YMIN:YMAX]
Finally, your highly complicated plot:
plot sin(x)
Result:
This method also allows you to break the axis
Drawing axis twice:
This method is easier; but you need to set set margins of the canvas, and to use the multiplot mode:
set tmargin at screen 0.9 # top margin
set bmargin at screen 0.2 # bottom
set lmargin at screen 0.2 # left
set rmargin at screen 0.9 # right
set yrange [-1.2:1.2]
set multiplot
set tics scale 0.5 # scale size of the tics
plot 2 notitle # a plot outside the canvas, just to draw the axis
set tics out # tics outside
set format xy '' # delete the numbers
unset border # delete the border
plot sin(x) # your awesome plot
unset multiplot
The result is similar :)

Answer 2

Quick & dirty approach:
set multi
set tics scale 0.5
plot sin(x)/x
set tics out
replot
unset multi
Beware this overprints your graph with a second one. Should be OK for bitmap output, but don't do it if you have vector output (pdf, eps), especially if your graph is complicated or contains a lot of datapoints. It blows up the resulting file to twice its size.
Gnuplot at the moment (v 5.0pl1) has no option to place the tics centered on the axis. You'll have to use one of the workarounds shown here.