gnuplot标记数据

Question

I am new to gnuplot and am having trouble finding the meaning of some of the commands. I want to plot a csv file where the rows are data points and the three columns represent the data label, x value and y value respectively. I want the second column on the x axis and the third column on the y axis and the first column to be the label attached to that point. Here is the data

ACB,  0.0000000,  0.0000000000
ASW,  1.0919705, -0.0864042502
CDX,  0.0000000,  0.0000000000
CEU, -0.4369415, -0.5184317277
CHB, -0.4686879,  0.7764323199
CHD,  0.0000000,  0.0000000000
CHS, -0.4141749,  0.7482543582
CLM, -0.2559306, -0.2535837629
FIN, -0.5004242, -0.2108050200
GBR, -0.4140216, -0.5132990203
GIH,  0.0000000,  0.0000000000
IBS, -0.4928541, -0.5812216372
JPT, -0.4821734,  0.7263450301
KHV,  0.0000000,  0.0000000000
LWK,  1.4515552, -0.0003996165
MKK,  0.0000000,  0.0000000000
MXL, -0.4019733, -0.0484315198
PEL,  0.0000000,  0.0000000000
PUR, -0.2165559, -0.3173440295
TSI, -0.3956957, -0.4549254002   
YRI,  1.5555644, -0.0202297606

I have tried things like

plot 'infile' using 2:2 with labels, 'infile' using 1:2

but it reports "Not enough columns for this style". I don't really know what the numbers around the colons mean, although I see them everywhere in others' code.

Answer 1

You can do this with the following command:

set datafile sep ','
plot 'test.dat' u 2:3:1 w labels point offset character 0,character 1 tc rgb "blue"

Part of your confusion is probably gnuplot's shorthand notation for a lot of things. For example, in the command above, u stands for using and w stands for with and tc stands for textcolor . In general, gnuplot allows you to shorten a command to the shortest unique sequence of characters that can be used to identify it. so with can be w , wi , wit and gnuplot will recognize any of them since no other plot specifiers start with w .

The numbers after the using specifier are columns in your datafile. So here, the x position of the label is taken from the 2nd column. The y position is taken from the 3rd column. And the label text is taken from the 1st column which is where we get the using 2:3:1 . It's actually a lot more powerful than that (the syntax will allow you to add 2 columns together to derive an x or y position for instance), but explaining all of that should probably be left for another question.

Answer 2

Since you are using a csv file you should set the separator:

set datafile separator ','

Also, I think this is what you're trying to do:

plot 'infile' using 2:3, 'infile' 2:3:1 with labels offset 1