Gnuplot不同的颜色 [英] Gnuplot different colors

问题描述

我正在尝试用不同的颜色为绘图和gnuplot中的拟合着色，但这是行不通的:

I'm trying to color a plot and a fit in gnuplot in different colors, but it doesn't work:

set ylabel "s in m"
set xlabel "t in s"
unset key
set style line 1 lt 2 lc rgb "red" lw 3
set style line 2 lt 2 lc rgb "orange" lw 2
plot "-" with lines ls1
0 0
1 4.2
2 7.9
3 11.7
4 16.3
fit "-" with lines ls2
0 0
1 4.2
2 7.9
3 11.7
4 16.3

有人知道我在做什么错吗?

Does anybody have an idea what I am doing wrong?

推荐答案

您做错了几件事:

1. fit 命令与 plot 命令有点不同.您必须定义一个像 f(x)= a * x + b 的函数，并将其适合您的数据.这将为 a 和 b 计算适当的值.然后，您可以绘制函数.

1. The fit command is a bit different from the plot command. You must define a function like f(x) = a*x + b and fit this to your data. This calculates appropriate values for a and b. Afterwards you can plot the function.

您必须使用 e 终止内联数据.

You must terminate the inline data with an e.

要选择线条样式，请使用 ls 1 (在数字前带有空格).

To select a line style, use ls 1 (with the space before the number).

所以您的脚本应如下所示:

So your script should look as follows:

set ylabel "s in m"
set xlabel "t in s"
unset key
set style line 1 lt 2 lc rgb "red" lw 3
set style line 2 lt 2 lc rgb "orange" lw 2

f(x) = a*x + b
fit f(x) '-' via a,b
0 0
1 4.2
2 7.9
3 11.7
4 16.3
e

plot f(x) with lines ls 2, "-" with points ls 1
0 0
1 4.2
2 7.9
3 11.7
4 16.3
e

这会将您的拟合曲线绘制为一条线，并将相应数据绘制为点.

This plots your fit as a line, and the according data as points.

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