In short: In a plot for loop which starts at 1 you assign the header of column 2 to the variable myHeader, however, you are plotting nothing ( NaN) with title myHeader='' (empty string will not generate a keyentry). In the next iteration you plot column 2, with the previously extracted header. This will continue until the last column (here: N=4).ĭata: SO13371449.csv (some more example data added) n, John Smith stats, Sam Williams stats, Tom Muller stats
However, the above command will not work with gnuplot versions 4.6.0 to 5.2.8. Whereas title columnheader(col) will work, but title word(columnheader(col),1) will not. plot for FILE u 1:col w l title word(columnheader(col),1) Plot '=5.4.0. Check help columnheader and help word. Plot 'infile.csv' using 1:2 with lines title columnhead
If your version of Gnuplot is recent enough, you can use columnhead as the title argument: echo " You say you have a csv file, so I assume your data file looks like this (and is saved in infile.csv): n,John Smith stats,Sam Williams stats In addition, is it possible to make it adjustable in case I add a column to the table, so it automatically adds another line with the appropriate title? The question is how to retrieve first names from the first line of .csv rather than entering them manually? I've got a data.csv file which is structured like this: n John Smith stats Sam Williams statsĬurrently I'm plotting with the following command in gnuplot: plot 'data.csv' using 1:2 title 'John' with lines, '' using 1:3 title 'Sam' with lines 從 csv 讀取 gnuplot 圖例 (Reading gnuplot legend from csv) For instance if you had data points at, the x range would be set to. Would fill the plot in the x direction based on where the actual data lie. The stats command creates a bunch of handy variables stats 'data.txt'Ī slightly different command, stats 'data.txt' If you have gnuplot 4.6.0 or higher, you can take advantage of the stats command to avoid replotting. This is a little more compact than specifying with set yrange, but makes for a longer line of code. set title 'Use of stats command to find min/max/mean before plottingnTwo data columns' f(x) log(1+x) stats orbitalelements.dat index 1 using (f. Note the use of the range specifier again, this time with a y range specified. gnuplot demo script: m autogenerated by on Thu Nov 15 13:04:28 2018 gnuplot version gnuplot 5.2 patchlevel 5. If you don't want to replot to the same output terminal (which is not helpful in some terminals like eps where replotting makes a second page with the same plot), use this command sequence: set terminal unknown Set yr īy the way, the u 1:2 specification is redundant unless you want to remind yourself of which columns you are plotting, since plotting the first two columns as x and y is the gnuplot default. To take advantage of these variables you have to use the range specifiers to the plot command: plot 'data.txt' variables because gnuplot leaves a little space between the data and the edge of the plot). GPVAL_Y_MIN and GPVAL_Y_MAX are a little less useful generally because they tell you where the edges of the plot border are (in general these values extend a little beyond the GPVAL_DATA. The variables you want are GPVAL_DATA_Y_MIN and GPVAL_DATA_Y_MAX, which are the y-min/max of the data plotted in a certain range.
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