Gnuplot histogram
While it would not be impossible to implement a cut over a gradient, I believe, it is probably not worth the trouble it involves. The background colour is virtually constant at y=6 (c.f. This implies that we could not have a gradient at y=6. I should point out here that, in order to have a seamless cut, we have to use a colour for the vectors that is identical to the background at that particular point. Otherwise, we have finished the plot, there is nothing else to do.
![gnuplot histogram gnuplot histogram](http://i.stack.imgur.com/evDc0.png)
![gnuplot histogram gnuplot histogram](https://i.stack.imgur.com/GnD37.png)
The histogram graphically shows the following. '' u ($0+0.12):(g($3)+0.12):(0.25):(0.5) w vectors lt -1 lc rgb blue lw 5 nohead t ''Į.g., which stretches the vectors in the vertical direction. The purpose of a histogram (Chambers) is to graphically summarize the distribution of a univariate data set. If you want to have a steeper cut, you could Note that the plotting of the break points is automatic, once we have the definitions of the two helper functions. The labels are placed at the top of each column (this is why we could do away with the yaxis.) We also 'plot' the axis labels, and finally, plot the two break points. We plot the two sets of columns, and also plot the data file with labels. You can also skip the first plot, because that is nothing but our fancy background. For white background, you can skip this step. We also define a palette, but this is needed for the background only. In the next step, we set the properties of the histogram, like the width of the columns, the fill style, and the data style. In this particular case, I took 6, but it is arbitrary. The definitions of these depend on where you want to have the break point in the histogram. We set only the bottom axis, which means that we have to unset the ytics and set to xtics to nomirror. Likewise, you can drop the 'unset colorbox' line, when you have a white background. OK, so let us look at the code! The first couple of lines are required only, if you want to have some posh background. 'brokenhist.dat' u (f($2)) t 'Red bars',\ Set palette defined (0 "#ffff ff", 1 "#babaff")
![gnuplot histogram gnuplot histogram](http://www.gnuplot.info/demo/boxclusters.1.png)
Our data file, brokenhist.dat, is as follows