Question

我有一个x，y，z的数据文件，想要使用数据绘制3D圆锥体。我试过splot但它只给出了最后一个圆圈。我的数据文件采用以下格式：

感谢任何帮助。

提前致谢 -Abhi

Answer 1

此时，我认为显示一个简单的脚本可能更容易，该脚本可用于以gnuplot可用于绘制圆锥体的格式生成数据：

我将使用python有两个原因。首先，我知道它非常好，其次，它读起来非常像伪代码，所以即使你不懂python也应该很清楚发生了什么。

import math
h = 2
points_u = map(float,range(-h,h+1)) #[-2.,-1.,0.,1.,2.]

NTHETA = 12    #number of points in theta for the cone
dtheta = 2.*math.pi/NTHETA
points_theta = [dtheta*i for i in range(NTHETA+1)] #list of points in theta

with open('data.txt','w') as fout:  #open an output file for the data
    for theta in points_theta:
        for u in points_u:
            #This is how to plot a cone parametrically
            #Here I unravel the cone into it's x-y-z components
            #The important part is that within the inner loop,
            #we're writing data along a single theta.  In other words,
            #within the inner loop, we write a single straight line which
            #is on the surface of the cone.
            x = (h-u)/h*math.cos(theta)
            y = (h-u)/h*math.sin(theta)
            z = u
            fout.write('%f %f %f\n'%(x,y,z))

        #After the inner loop, you need to insert a blank line to let gnuplot know
        #that the particular "scan" is over and it is supposed to start a new "scan"
        #After all is said and done, gnuplot will connect the points.
        fout.write('\n')

现在生成数据文件data.txt。要在gnuplot中绘制此数据文件，您只需执行以下操作：

set surface
#set hidden3d  #This makes the object "non-transparent"
splot 'data.txt' using 1:2:3 with lines

使用用户数据文件的gnuplot绘制3D锥体

1 个答案: