使用gnuplot在轴上显示2的幂 [英] Display powers of 2 on the axis with gnuplot

问题描述

我正在尝试使用gnuplot绘制实验结果.

I am trying to use gnuplot to plot results from my experiments.

我编写了一个C ++程序，该程序生成一个如下所示的数据文件:

I wrote a C++ program that generates a datafile that looks like this:

10   3.5
11   3.5
12   3.5
13   3.6

我想要做的是将此数据文件的第一列的值显示为x的2的幂.它看起来像这样(不必看起来完全一样):

What I am trying to do is to display the values of the first column of this datafile on the x-axis as powers of 2. It would look something like that (It doesn't have to look exactly the same):

http://i.stack.imgur.com/8BSLr.png

所以对于我发布的数据文件，我想在x轴上有2 ^ 10、2 ^ 11等. 知道怎么做吗?

So with the datafile I posted, I want to have 2^10, 2^11, etc on the x axis. Any idea how to do that?

如果需要，我可以更改数据文件的格式.

I can change the format of the datafile if needed.

谢谢！

推荐答案

这可以通过操作using规范相对容易地完成:

this is done relatively easy by manipulating the using specification:

plot datafile using (2**$1):2

如果这样做，您可能还会想要一个

If you do this, you'll probably also want a

set logscale x 2
set format x '2^{%L}'  #<- enhanced text.

使图看起来更好

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