在 Matplotlib 中更改网格间隔并指定刻度标签 [英] Change grid interval and specify tick labels in Matplotlib
问题描述
我试图在网格图中绘制计数,但我无法弄清楚我是如何进行的.我想:
有间隔 5 的虚线网格
每 20 个有主要刻度标签
我希望刻度线在情节之外.
有计数"在那些网格内
我已经检查了潜在的重复项,例如
I am trying to plot counts in gridded plots, but I am not being able to figure out how I go about it. I want to:
Have dotted grids at an interval of 5
Have major tick labels only every 20
I want the ticks to be outside the plot.
Have "counts" inside those grids
I have checked for potential duplicates such as here and here, but I have not been able to figure it out.
This is my code.
import matplotlib.pyplot as plt
from matplotlib.ticker import MultipleLocator, FormatStrFormatter
for key, value in sorted(data.items()):
x = value[0][2]
y = value[0][3]
count = value[0][4]
fig = plt.figure()
ax = fig.add_subplot(111)
ax.annotate(count, xy = (x, y), size = 5)
# Overwrites and I only get the last data point
plt.close()
# Without this, I get "fail to allocate bitmap" error
plt.suptitle('Number of counts', fontsize = 12)
ax.set_xlabel('x')
ax.set_ylabel('y')
plt.axes().set_aspect('equal')
plt.axis([0, 1000, 0, 1000])
# This gives an interval of 200
majorLocator = MultipleLocator(20)
majorFormatter = FormatStrFormatter('%d')
minorLocator = MultipleLocator(5)
# I want minor grid to be 5 and major grid to be 20
plt.grid()
filename = 'C:UsersOwlDesktopPlot.png'
plt.savefig(filename, dpi = 150)
plt.close()
This is what I get.
I also have a problem of overwriting the data points. Could anybody PLEASE help me with this problem?
There are several problems in your code.
First the big ones:
You are creating a new figure and a new axes in every iteration of your loop → put
fig = plt.figure
andax = fig.add_subplot(1,1,1)
outside of the loop.Don't use the Locators. Call the functions
ax.set_xticks()
andax.grid()
with the correct keywords.With
plt.axes()
you are creating a new axes again. Useax.set_aspect('equal')
.
The minor things:
You should not mix the MATLAB-like syntax like plt.axis()
with the objective syntax.
Use ax.set_xlim(a,b)
and ax.set_ylim(a,b)
This should be a working minimal example:
import numpy as np
import matplotlib.pyplot as plt
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
# Major ticks every 20, minor ticks every 5
major_ticks = np.arange(0, 101, 20)
minor_ticks = np.arange(0, 101, 5)
ax.set_xticks(major_ticks)
ax.set_xticks(minor_ticks, minor=True)
ax.set_yticks(major_ticks)
ax.set_yticks(minor_ticks, minor=True)
# And a corresponding grid
ax.grid(which='both')
# Or if you want different settings for the grids:
ax.grid(which='minor', alpha=0.2)
ax.grid(which='major', alpha=0.5)
plt.show()
Output is this:
这篇关于在 Matplotlib 中更改网格间隔并指定刻度标签的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!