使用gnuplot的向量场 [英] Vector field using gnuplot

问题描述

如何绘制矢量场，其中每个点(x，y)的方向由tangent(alpha) = f(x, y)给出?

How do I plot a vector field, where the direction at each point (x, y) is given by tangent(alpha) = f(x, y)?

推荐答案

据我所知，gnuplot在从文件读取数据时只能绘制矢量字段.您的文件必须具有4列，即x，y，deltax和delta y，然后gnuplot将为文件中的每一行绘制一个从(x，y)到(x + deltax，y + deltay)的向量:

As far as I can tell, gnuplot can only plot vector fields when reading data from a file. Your file will have to have 4 columns, x, y, deltax and delta y, and gnuplot will then plot a vector from (x,y) to (x+deltax, y+deltay) for each line in the file:

plot "file.dat" using 1:2:3:4 with vectors head filled lt 2

如果您不坚持使用gnuplot，则可以使用其他工具更好或更轻松地实现.我个人使用渐近线.在渐近线此处中绘制了一个矢量场的示例.

If you are not insisting on using gnuplot, there are other tools that can to this better or at least easier. I personally use asymptote. There is an example of a vectorfield plotted in asymptote here.

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