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    <p>I have not found a way to solve this using the <code>grid</code> and <code>border</code>. However, there is a relatively simple workaround, which is useful only if you do not change your ranges every time you plot your data.</p> <p>Basically you plot a constant surfaces on the back walls matching the line type and number and position of the grid lines in the x-y plane.</p> <p>First, set up the ranges. I labeled them, because we will need the numbers later.</p> <pre><code>xmin=0 ; xmax = 100 ymin=0.01 ; ymax=1000 zmin=0 ; zmax=990 set xrange [xmin:xmax] set yrange [ymin:ymax] set zrange [zmin:zmax] </code></pre> <p>Setting the z axis intersection with x-y plane (ticslevel) and I guessed a view angle to visually match your example. We want to set these before <code>multiplot</code>.</p> <pre><code>set ticslevel 0.0 set view 60,45,1 </code></pre> <p>Now comes the fun. For this part you have to know the number of grid lines in your x-y plane (same as number of major tics on x and y axes). We will plot the back grid walls first, so they are behind your data/function at the end. Also, I switch off the grid and border for this part, but they should exactly overlap if you leave them in.</p> <pre><code>set multiplot unset grid set border 0 </code></pre> <p>Even though the y-axis has logarithmic scale, the grid is separated linearly (equidistant grid lines). So at this point I want linear scale on y axis. (If you <code>set logscale y</code> before this point, comment it out.) I don't want linear labels on the y-axis, because they are different on logarithmic scale, so I set the format accordingly.</p> <pre><code>set format y "" set isosamples 6,9 # - set this to number of tics on y-axis,z-axis </code></pre> <p>Here is the only manual setting that might change when you plot on a different range. You need to set the numbers of <code>isosamples</code> to the numbers of tics on y-axis,z-axis.</p> <p>To control how many lines gnuplot is going to use for each surface, we need to set both the isosamples (done above) and the ranges of dummy variables <code>u,v</code>. Notice the line type 0, which is the grid line type. I plot my first wall at x = xmin:</p> <pre><code>set parametric set urange [ymax:ymin] set vrange [zmax:zmin] splot xmin,u,v w lines lt 0 </code></pre> <p>Similarly, we do the other wall at y = ymax.</p> <pre><code>set urange [xmin:xmax] set vrange [zmin:zmax] splot u,ymax,v w lines lt 0 unset parametric </code></pre> <p>Now that I have the walls, I can plot what you already have in the picture. Setting borders, tics, re-enable the y-axis label we disabled before, set the log-scale on y axis (now is a good time) and reset isosamples to the default values. </p> <pre><code>set xtics mirror set ytics mirror set ztics mirror set grid ytics xtics back set logscale y set format y " %g" set isosamples 10,10 </code></pre> <p>And plot your data/function as you are used to.</p> <pre><code>splot 'data.txt' w lines unset multiplot </code></pre> <p>And we are done....</p> <p>Possible necessary modification:<br> I guess your x and y axes will be different from mine, since the reverse is easily achievable by something like <code>view 60,135,1</code>. This also switches x and y though. Your surfaces will then change coordinates.</p>
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    1. POHow do I place tic marks along the top borders in a 3d plot?
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    1. COwow, thanks for this detailed answer! I will get back to you when I've had a chance to try it. Looks promising...
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    2. CONo problem. I had fun solving this. I learned more about 3D plotting, it's quite neat, actually... I am usually stuck with 2D...
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    3. COI just wanted to thank you again for this solution. I implemented it without a problem, except that I usually do have a reverse view, so had to change some x,y limits. Having the vertical grid lines there really makes some of my plots easier to read and more meaningful!
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