Plot '4col.csv' using 1:2 with lines, '4col.csv' using 1:3 with lines To show multiple curves on one plot, use the 4col.csv file: You can adorn your plots with titles, labels, legend, arrows, and more: Plot '2col.csv' u 1:2 w l title 'Squared' # 'u' - using, 'w l' - with lines Plot '2col.dat' using 2:1 # 2=x, 1=y (reverse the graph) Plot '2col.dat' using 1:2 # 1=x, 2=y (this is the default) Plot '2col.dat' with lines title 'my curve' # this is really the line-title in the legend Plot '2col.dat' with linespoints # plot only elements 3 thru 7 Plot '2col.dat' with linespoints # plot the first 5 elements Plot '2col.dat' with points # just points (default) Plot '2col.dat' with linespoints # line and points Plot '2col.dat' with lines # connect points with a line Plot '2col.dat' # assumes col1=x, col2=y shows '+' at data points Opens plot in an ’AquaTerm’ on Mac OS Xįrom here you can do all sorts of fun things:.Assumes col1=x, col2=y shows ’+’ at data points.Plotting the data from a two-column file is easy: It prompts you with gnuplot> as shown, but I won’t show that prompt in the examples below. The latest version of Gnuplot works with both formats without requiring you to specify a column-separator. Note that the columns in the first file are separated by whitespace, and the columns in the second file are separated by commas (a CSV file). The examples below use the following 2-column and 4-column data files: You can find more information about the need for this new brew command at this SO link. Please select a terminal with 'set terminal'. WARNING: Plotting with an 'unknown' terminal. You’ll know that you need that command if you get this error message when you try to run a plot command inside the gnuplot command line: Note that with OS X Yosemite (10.10.x) I had to use this brew command instead: To get started, you can use MacPorts or Homebrew to install Gnuplot on Mac OS X systems: If you haven’t used it before, it’s an amazing tool for creating graphs and charts. This causes the X axis data (once reformatted to match that pattern) to be interpreted as time-series data.I needed to use Gnuplot a little bit over the last few days, mostly to create 2D line charts, and these are my brief notes on how to get started with Gnuplot. Turns out gnuplot has support for graphing time-series data. The problem is that it seems to plot these labels for every xtic (that is, one per second in my data set), rather than at the intervals defined by set xtics. Progress, I've discovered the xticlabels() parameter to plot. I've got to assume this is possible, I just don't know where to look. I can't even find anything that looks promising in the gnuplot manual. What I can't get is for the labels that show up under each tick to use the values from the first column. I can plot the values I care about using something like: gnuplot> plot "my_data.txt" using 2:3 with linesĪnd I can set the X axis to have a tick (and label) every 30 minutes (which is 30 * 60 = 1800 seconds), but the label it uses is the X axis value (something like 3600 for one hour). (In actual point of fact, I have one row per second, so many rows have '1:00am' as in the label column, then '1:01am', etc). The first column contains (what I'd like to be) the X-axis labels, while the second column contains the X-axis values. My input to gnuplot looks something like this: 1:00am 1 10
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