概述
我不是科学家,所以请假设我不知道有经验的程序员的行话,或者科学绘图技术的复杂性. Python是我所知道的唯一语言(初学者,也许是中级).
任务:将多元回归的结果(z = f(x,y))绘制为3D图形上的二维平面(例如,我可以使用OSX的图形工具,或者在此使用R实现Plot Regression Surface).
经过一周搜索Stackoverflow并阅读matplotlib,seaborn和mayavi的各种文档后,我终于找到了Simplest way to plot 3d surface given 3d points,听起来很有希望.所以这是我的数据和代码:
首先尝试使用matplotlib:
shape: (80,3)
type:
ndarray'>
zmul:
[[ 0.00000000e+00 0.00000000e+00 5.52720000e+00]
[ 5.00000000e+02 5.00000000e-01 5.59220000e+00]
[ 1.00000000e+03 1.00000000e+00 5.65720000e+00]
[ 1.50000000e+03 1.50000000e+00 5.72220000e+00]
[ 2.00000000e+03 2.00000000e+00 5.78720000e+00]
[ 2.50000000e+03 2.50000000e+00 5.85220000e+00]
……]
import matplotlib
from matplotlib.ticker import MaxNLocator
from matplotlib import cm
from numpy.random import randn
from scipy import array,newaxis
Xs = zmul[:,0]
Ys = zmul[:,1]
Zs = zmul[:,2]
surf = ax.plot_trisurf(Xs,Ys,Zs,cmap=cm.jet,linewidth=0)
fig.colorbar(surf)
ax.xaxis.set_major_locator(MaxNLocator(5))
ax.yaxis.set_major_locator(MaxNLocator(6))
ax.zaxis.set_major_locator(MaxNLocator(5))
fig.tight_layout()
plt.show()
RuntimeError:qhull delaunay三角测量计算中的错误:奇异输入数据(exitcode = 2);使用python verbose选项(-v)来查看原始的qhull错误.
我试着看看我是否可以使用绘图参数并检查这个网站http://www.qhull.org/html/qh-impre.htm#delaunay,但我真的无法理解我应该做什么.
第二次尝试使用mayavi:
相同的数据,分为3个numpy数组:
type:
ndarray'>
X: [ 0 500 1000 1500 2000 2500 3000 ….]
type:
ndarray'>
Y: [ 0. 0.5 1. 1.5 2. 2.5 3. ….]
type:
ndarray'>
Z: [ 5.5272 5.5922 5.6572 5.7222 5.7872 5.8522 5.9172 ….]
码:
from mayavi import mlab
def multiple3_triple(tpl_lst):
X = xs
Y = ys
Z = zs
# Define the points in 3D space
# including color code based on Z coordinate.
pts = mlab.points3d(X,Y,Z,Z)
# Triangulate based on X,Y with delaunay 2D algorithm.
# Save resulting triangulation.
mesh = mlab.pipeline.delaunay2d(pts)
# Remove the point representation from the plot
pts.remove()
# Draw a surface based on the triangulation
surf = mlab.pipeline.surface(mesh)
# Simple plot.
mlab.xlabel("x")
mlab.ylabel("y")
mlab.zlabel("z")
mlab.show()
我得到的就是:
如果这很重要,我在OSX 10.9.3上使用64位版本的Enthought’s Canopy
对于我做错了什么的输入,将不胜感激.
编辑:发布有效的最终代码,以防有人帮助.
'''After the usual imports'''
def multiple3(tpl_lst):
mul = []
for tpl in tpl_lst:
calc = (.0001*tpl[0]) + (.017*tpl[1])+ 6.166
mul.append(calc)
return mul
fig = plt.figure()
ax = fig.gca(projection='3d')
'''some skipped code for the scatterplot'''
X = np.arange(0,40000,500)
Y = np.arange(0,40,.5)
X,Y = np.meshgrid(X,Y)
Z = multiple3(zip(X,Y))
surf = ax.plot_surface(X,rstride=1,cstride=1,cmap=cm.autumn,linewidth=0,antialiased=False,alpha =.1)
ax.set_zlim(1.01,11.01)
ax.set_xlabel(' x = IPP')
ax.set_ylabel('y = UNRP20')
ax.set_zlabel('z = DI')
ax.zaxis.set_major_locator(LinearLocator(10))
ax.zaxis.set_major_formatter(FormatStrFormatter('%.02f'))
fig.colorbar(surf,shrink=0.5,aspect=5)
plt.show()
from mpl_toolkits.mplot3d import Axes3D
from matplotlib import cm
from matplotlib.ticker import LinearLocator,FormatStrFormatter
import matplotlib.pyplot as plt
import numpy as np
fig = plt.figure()
ax = fig.gca(projection='3d')
X = np.arange(-5,5,0.25)
Y = np.arange(-5,0.25)
X,Y)
R = np.sqrt(X**2 + Y**2)
Z = np.sin(R)
surf = ax.plot_surface(X,cmap=cm.coolwarm,antialiased=False)
ax.set_zlim(-1.01,1.01)
ax.zaxis.set_major_locator(LinearLocator(10))
ax.zaxis.set_major_formatter(FormatStrFormatter('%.02f'))
fig.colorbar(surf,aspect=5)
plt.show()
总结
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