gnuplot标记数据 [英] gnuplot plot labelled data
问题描述
我是gnuplot的新手,无法找到某些命令的含义。我想绘制一个csv文件,其中行是数据点,三列分别表示数据标签,x值和y值。我想要x轴上的第二列和y轴上的第三列,第一列是附加到该点的标签。这是数据
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
我已经尝试过类似
plot 'infile' using 2:2 with labels, 'infile' using 1:2
,但报告 。我真的不知道冒号周围的数字是什么意思,虽然我看到他们无处不在别人的代码。
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.
推荐答案
您可以使用以下命令执行此操作:
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"
部分混淆可能是gnuplot的很多事情的简写符号。例如,在上面的命令中, u
代表使用
和 w
代表与和
tc
代表 textcolor
。一般来说,gnuplot允许您将命令缩短到可用于识别它的最短唯一字符序列。因此与可以是
w
, wi
, wit
和gnuplot将识别它们,因为没有其他的绘图说明符以 w
开头。
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
.
使用说明符后面的数字是数据文件中的列。所以这里,标签的x位置取自第二列。 y位置取自第3列。标签文本取自第一列,这是我们使用2:3:1 得到的地方。它实际上比那更强大(语法将允许你添加2列在一起来导出x或y位置例如),但解释所有这一切应该留给另一个问题。
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.
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