How to set a line style as default for multiple plots in Gnuplot

You can't do this without modifying something about the way you input the data. When feeding gnuplot data via standard input, it expects multiple data sets to be delimited with two blank lines between them, or to be interleaved on successive lines. The options are:

• Feed the two data sets into different plot commands altogether.

• Change the file format so that data sets have blank lines between them, then reference them all with index.

• Change the file format so that alternating lines represent different data sets, then reference them all with every.

• Put the data into one file, the plotting script into another, and then reference the data file more than once with different using clauses each time.

There's an intro to the every and index commands starting at How do I plot several data sets in a single file? Those are the only facilities built into gnuplot for this sort of thing, and neither does exactly what you were asking about. it's good you've already modified the data formatting, because this wasn't ever going to work as you'd originally hoped.

try:

set multiplot layout 1,2 title "blah"

Of course, this can be can be combined with the set title commands so you can have a page title (from multiplot) and then individual plot titles (from set title).

Here's a stupid example illustrating all of the different places that "title" is used.:

set multiplot layout 1,2 title "Sine and Cosine"
set title "Sine is coolest!"
plot sin(x)

set title "Cosine is coolest!"
plot cos(x) title "Cool",tan(x) title "Lame"

If you want more fine control over the page title, you can always use a label specifying the coordinates as screen. Just add this before the last plot and you're all set. (If you add it before the first plot, the same label may be drawn a few times which is probably not what you want.)

For example:

set label "Sine and Cosine" at screen 0.5,0.95 center front

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