bins = np.array([0, 0.5, 1, 2, 10]) # 股价上涨的公司 shares_up = shares_price[shares_price['increase'] > 0] # 按涨幅进行分组 shares_up['label'] = pd.cut(shares_up['increase'], bins) # 分组统计 up_label_count = shares_up[['label', 'code']].groupby('label').count() up_label_count['占比'] = up_label_count['code'] / up_label_count.sum().values sns.barplot(x=up_label_count['占比'], y=up_label_count.index)修改代码，使配色好看

解释代码import numpy as np import matplotlib.pyplot as plt # plt 用于显示图片 import matplotlib.image as mpimg # mpimg 用于读取图片 fig = plt.figure() #matplotlib只支持PNG图像 lena = mpimg.imread('cat.jpg') lena_r=np.zeros(lena.shape) #0通道 lena_r[:,:,0]=lena[:,:,0] ax1=fig.add_subplot(331) ax1.imshow(lena_r)# 显示R通道 lena_g=np.zeros(lena.shape)#1通道 lena_g[:,:,1]=lena[:,:,1] ax4=fig.add_subplot(334) ax4.imshow(lena_g)# 显示G通道 lena_b=np.zeros(lena.shape)#2通道 lena_b[:,:,2]=lena[:,:,2] ax7=fig.add_subplot(337) ax7.imshow(lena_b)# 显示B通道 img_R = lena_r[:,:,0] R_mean=np.mean(img_R) R_std=np.std(img_R) ax2=fig.add_subplot(332) flatten_r=img_R.flatten() weights = np.ones_like(flatten_r)/float(len(flatten_r)) prob_r,bins_r,_=ax2.hist(flatten_r,bins=10,facecolor='r',weights=weights) img_G = lena_g[:,:,1] G_mean=np.mean(img_G) G_std=np.std(img_G) ax5=fig.add_subplot(335) flatten_g=img_G.flatten() prob_g,bins_g,_=ax5.hist(flatten_g,bins=10,facecolor='g',weights=weights) img_B = lena_b[:,:,2] B_mean=np.mean(img_B) B_std=np.std(img_B) ax8=fig.add_subplot(338) flatten_b=img_B.flatten() prob_b,bins_b,_=ax8.hist(flatten_b,bins=10,facecolor='b',weights=weights) ax3=fig.add_subplot(233) rgb_mean=[R_mean,G_mean,B_mean] x_mlabel=['R_mean','G_mean','B_mean'] bar_width=0.5 bars_mean=ax3.bar(x_mlabel,rgb_mean,width=bar_width) colors=['r','g','b'] for bar,color in zip(bars_mean,colors): bar.set_color(color) ax3.set_title('Mean') ax9 = fig.add_subplot(236) rgb_std =[R_std,G_std,B_std] x_mlabel = ['R_std','G_std','B_std'] bar_width = 0.5 bars_std = ax9.bar(x_mlabel,rgb_std,width = bar_width) colors = ['r','g','b'] for bar,color in zip(bars_std,colors): bar.set_color(color) ax9.set_title('Std') # fig.set_tight_layout(True) plt.show()

这段代码主要是读取一张名为"cat.jpg"的图片，并对其RGB三个通道进行分析和统计。首先，将原图的RGB三个通道分别提取出来，然后在左上角、左中和左下角用subplot展示三个通道的图像。接着，分别计算每个通道的...

import numpy as np import pandas as pd def localmin(points, pixel_size): x_min = np.min(points[:, 0]) y_min = np.min(points[:, 1]) x_max = np.max(points[:, 0]) y_max = np.max(points[:, 1]) w = x_max - x_min h = y_max - y_min wn = w // pixel_size + 1 hn = h // pixel_size + 1 x_bins = np.array([i * pixel_size for i in range(int(wn + 1))]) y_bins = np.array([i * pixel_size for i in range(int(hn + 1))]) df = pd.DataFrame(points, columns=['x', 'y', 'z', 'classification', 'indices']) df['x_bin'] = pd.cut(df['x'], bins=x_bins) df['y_bin'] = pd.cut(df['y'], bins=y_bins) result = df.groupby(['x_bin', 'y_bin']).apply(lambda x: x.loc[x['z'].idxmin()])[['x', 'y', 'z', 'classification', 'indices']] return result a = np.random.random([100,3]) b = np.random.random([100, 1])//0.5 c = np.arange(1000).reshape([100,1]) a = np.concatenate([a,b,c],axis=-1) d = localmin(a,0.2) 如何从a中删除d中的点

x_bins = np.array([i * pixel_size for i in range(int(wn + 1))]) y_bins = np.array([i * pixel_size for i in range(int(hn + 1))]) df = pd.DataFrame(points, columns=['x', 'y', 'z', 'classification',...

import numpy as npimport matplotlib.pyplot as pltfrom scipy.stats import norm# 生成随机数据data = np.random.randn(1000)# 绘制直方图plt.hist(data, bins=30, density=True, alpha=0.5)# 拟合正态分布曲线mu, std = norm.fit(data)x = np.linspace(-5, 5, 100)p = norm.pdf(x, mu, std)plt.plot(x, p, 'k', linewidth=2)# 显示图像plt.show()讲一下各变量

这是Python中导入NumPy、Matplotlib和SciPy库的代码。这些库都是用于科学计算和数据可视化的常用工具。其中NumPy提供了高效的数组和矩阵运算功能，Matplotlib用于绘制各种类型的图表，而SciPy则提供了许多科学计算的...

解释每条语句作用import matplotlib.pyplot as plt import numpy as np # 解决中文显示问题 plt.rcParams['font.sans-serif'] = ['SimHei'] plt.rcParams['axes.unicode_minus'] = False def main(): #主函数 total_time = 100000 # 记录骰子的结果 roll1_arr = np.random.randint(1, 7, size=total_time) roll2_arr = np.random.randint(1, 7, size=total_time) result_arr = roll1_arr + roll2_arr hist, bins = np.histogram(result_arr, bins=range(2, 14)) print(hist) print(bins) # 数据可视化 plt.hist(result_arr, bins=range(2, 14), density=1, edgecolor='black', linewidth=1, rwidth=0.5) # 设置x轴坐标点显示 tick_label = ['2点', '3点', '4点', '5点', '6点', '7点', '8点', '9点', '10点', '11点', '12点'] tick_pos = np.arange(2, 13) + 0.5 plt.xticks(tick_pos, tick_label) plt.title('骰子点数统计') plt.xlabel('点数') plt.ylabel('频率') plt.show() if name == 'main': main()

- plt.hist(result_arr, bins=range(2, 14), density=1, edgecolor='black', linewidth=1, rwidth=0.5)：调用 matplotlib 的 hist() 方法绘制直方图，其中 bins 参数表示直方图的边界，density 参数表示频率归一化...

优化一下这些代码import cv2import numpy as np# 读入图片img = cv2.imread('image.jpg', cv2.IMREAD_GRAYSCALE)# 计算直方图hist, bins = np.histogram(img.flatten(), 256, [0, 256])# 计算累积分布函数cdf = hist.cumsum()cdf_normalized = cdf * hist.max() / cdf.max()# 均衡化处理img_equalized = np.interp(img.flatten(), bins[:-1], cdf_normalized).reshape(img.shape)# 显示原图和均衡化后的图cv2.imshow('Original Image', img)cv2.imshow('Equalized Image', img_equalized)cv2.waitKey(0)

hist, bins = np.histogram(img, 256, [0, 256]) # 计算累积分布函数 cdf = hist.cumsum() cdf_normalized = cdf * hist.max() / cdf.max() # 均衡化处理 img_equalized = cv2.equalizeHist(img) # 显示原图和...

请解读以下代码：import numpy as np import matplotlib.pyplot as plt np.random.seed(42) dice = np.random.randint(1, 7, 1000) bins = np.arange(1, 8, 1) count = np.histogram(dice, bins=bins)[0] fig, ax = plt.subplots(figsize=(8, 6)) ax.bar(bins[:-1], count, align='center', alpha=0.7, color='black', edgecolor='darkblue') ax.grid(True, linestyle='--', alpha=0.5) ax.set_xlabel('Result') ax.set_ylabel('Occurrences') ax.set_title('Histogram of Dice Throwing Results') ax.set_xticks(bins[:-1]) ax.set_xticklabels(bins[:-1]) plt.savefig('dice_histogram.jpg') plt.show()

2. 第二行代码使用numpy库的randint()函数生成了一个大小为1000的随机整数数组，其中数组中的每个元素都是1~6之间的随机整数，表示一次骰子的投掷结果。 3. 第三行代码使用numpy库的arange()函数生成了一个从1到7...

Traceback (most recent call last): File "ADF.py", line 18, in <module> atoms.set_calculator(SinglePointCalculator(atoms, energy=0, forces=np.zeros((len(atoms), 3)), stress=np.zeros(6), neighborlist=nl)) File "/export/home/anliying/.local/lib/python3.8/site-packages/ase-3.22.1-py3.8.egg/ase/calculators/singlepoint.py", line 22, in init assert property in all_properties AssertionError。import numpy as np from ase.io import read from ase.build import make_supercell from ase.visualize import view from ase.neighborlist import NeighborList from ase.calculators.singlepoint import SinglePointCalculator # 读入三个POSCAR文件，计算原子分布函数 structures = [] for file in ['structure1.cif', 'structure2.cif', 'structure3.cif']: atoms = read(file) # 构造超胞，避免周期性边界对ADF计算的影响 atoms = make_supercell(atoms, [[2, 0, 0], [0, 2, 0], [0, 0, 2]]) # 计算邻居列表 nl = NeighborList([1.2] * len(atoms), self_interaction=False) nl.update(atoms) # 将邻居列表传递给SinglePointCalculator atoms.set_calculator(SinglePointCalculator(atoms, energy=0, forces=np.zeros((len(atoms), 3)), stress=np.zeros(6), neighborlist=nl)) # 计算原子分布函数 adf = atoms.get_atomic_distribution_function() structures.append(adf) # 将ADF转化为特征矩阵 bins = np.linspace(0, 10, num=100) # 分100个bin adf_hists = [np.histogram(adf, bins=bins)[0] for adf in structures] feature_matrix = np.array(adf_hists) / [len(atoms) for atoms in structures] # 归一化特征矩阵 feature_matrix = feature_matrix / np.linalg.norm(feature_matrix, axis=1, keepdims=True)，基于错误改代码

atoms.set_calculator(SinglePointCalculator(atoms, energy=0, forces=np.zeros((len(atoms), 3)), stress=np.zeros(6), properties=['energy', 'forces'], neighborlist=nl)) Note that I have also added ...

import pandas as pd import numpy as np import matplotlib.pyplot as plt import math data = np.load('dataset_em.npy') mu0 = np.array([np.mean(data) - 1, np.mean(data) + 1]) sg0 = np.array([1.0, 1.0]) w0 = [0.5, 0.5] ary_mu = [mu0] ary_sg = [sg0] ary_w = [w0] x = np.arange(-10, 15, 0.1) def pdf_gauss(x, mu, sg): c = 1 / np.sqrt(2 * np.pi) p = c / sg * np.exp(-0.5 * ((x - mu) / sg) ** 2) return p def gauss_mix_pdf(w, x, mu, sg): p = w[0] * pdf_gauss(x, mu[0], sg[0]) + w[1] * pdf_gauss(x, mu[1], sg[1]) return p for j in range(0, 100): mu = ary_mu[j] sg = ary_sg[j] w = ary_w[j] gama = [] for i in (0, 1): b = w[i] * pdf_gauss(data, mu[i], sg[i]) c = gauss_mix_pdf(w, data, mu, sg) gama.append(b / c) gama_sum0 = np.sum(gama[0]) gama_sum1 = np.sum(gama[1]) new_mu = [np.sum(data * gama[0]) / gama_sum0, np.sum(data * gama[1]) / gama_sum1] new_sg = [np.sqrt(np.sum(gama[0] * np.power(data - new_mu[0], 2)) / gama_sum0), np.sqrt(np.sum(gama[1] * np.power(data - new_mu[1], 2)) / gama_sum1)] # 第二个数太大了 new_w = [gama_sum0 / data.shape[0], gama_sum1 / data.shape[0]] ary_mu.extend([new_mu]) ary_sg.extend([new_sg]) ary_w.extend([new_w]) del gama y = gauss_mix_pdf(ary_w[100], x, ary_mu[100], ary_sg[100]) plt.figure() plt.hist(data, bins=100, facecolor="blue", edgecolor="black", alpha=0.7, density=True) plt.plot(x, y) plt.show() 请逐句详细解释这段代码

mu0 = np.array([np.mean(data) - 1, np.mean(data) + 1]) sg0 = np.array([1.0, 1.0]) w0 = [0.5, 0.5] 初始化高斯混合模型的均值(mu)、标准差(sg)和权重(w)。 python ary_mu = [mu0] ary_sg = [sg0] ary_w...

优化这段代码x = np.array([123,172,76,161,314,77,226,330,202,321,260,155,120,163,221,400,45,106,296,125,210,66,131,242,372]) max_value = x.max() min_value = x.min() m = int(math.ceil((max_value - min_value)/w)) bins = [min_value+k*w for k in range(0, m+1)] x_cuts = pd.cut(x, bins, right=False) number = pd.value_counts(x_cuts) array = number.values rows = number.max() width = np.full([m, rows], 0) size = x.size a = 0 for j in range(0, m): for i in range(0, array[j]): width[j][i] = x[a] a = a + 1 mid_width = np.full([m, rows], 0) for i in range(0, m): for j in range(0, array[i]): mid_width[i][j] = np.median(width[i]) print(mid_width)

x = np.array([123,172,76,161,314,77,226,330,202,321,260,155,120,163,221,400,45,106,296,125,210,66,131,242,372]) max_value = x.max() min_value = x.min() m = int(math.ceil((max_value - min_value)/w))...

import seaborn as sns import numpy as np np.random.seed(123) # a、服从μ=0,σ=1 的正态分布： data=np.random.randn(10000) # data sns.distplot(data) # b、服从μ=loc,σ=scale 的正态分布： #loc:正太分布的均值 scale:正太分布的标准差 size:设定数组形状 data2=np.random.normal(loc=2, scale=1, size=10000) data2 sns.distplot(data2)这段代码用matplotlib绘制

plt.hist(data1, bins=50, alpha=0.5, label='μ=0, σ=1') plt.hist(data2, bins=50, alpha=0.5, label='μ=2, σ=1') # 添加标签和标题 plt.xlabel('Value') plt.ylabel('Frequency') plt.title('Normal ...

yolov5中y = ax[0].hist(c, bins=np.linspace(0, nc, nc + 1) - 0.5, rwidth=0.8)

这行代码是使用Matplotlib库中的hist()函数绘制直方图...np.linspace(0, nc, nc+1) - 0.5是生成nc个bin的边界，rwidth是每个bin的宽度。函数返回一个元组，其中第一个元素是每个bin的数量，第二个元素是每个bin的边界。

分析 bins = np.arange(n+2)

这行代码的作用是创建一个包含从0到n-2的整数的NumPy数组。具体来说，np.arange(n-2)会创建一个从0到n-3的整数序列，因为arange函数不包括终止值，所以n-2是序列的最大值。...例如，如果n=5，则bins的值为[0, 1, 2]。

test_mean_max = np.max(test_mean) test_mean_min = np.min(test_mean) bins = 10 fig = plt.figure(figsize=(8, 6)) ax = plt.subplot(111) ax.hist(test_mean, bins=bins, range=(test_mean_min, test_mean_max), density=True, rwidth=0.9) mu, sigma = test_mean.mean(), test_mean.std() x = np.linspace(test_mean_min, test_mean_max, 100000) y = 1 / (sigmanp.sqrt(2np.pi)) * np.exp(- (x-mu)**2 / (2*sigma**2)) ax.plot(x, y) plt.show()为什么已经归一化，y轴的值有大于1的值

在这段代码中，density=...但是，代码中添加的曲线是正态分布的概率密度函数，它的最大值是1/sqrt(2*pi*sigma^2)，也就是说，它的最大值并不是1。因此，即使直方图被归一化为概率密度，曲线的最大值仍然可以大于1。

import numpy as np import math x = np.array([123,172,76,161,314,77,226,330,202,321,260,155,120,163,221,400,45,106,296,125,210,66,131,242,372]) x.sort() x=5 max_value = x.max() min_value = x.min() m = int(math.ceil((max_value - min_value)/w)) bins = [min_value+k*w for k in range(0, m+1)] x_cuts = pd.cut(x, bins, right=False) number = pd.value_counts(x_cuts) array = number.values rows = number.max() width = np.full([m, rows], 0) size = x.size a = 0 for j in range(0, m): for i in range(0, array[j]): width[j][i] = x[a] a = a + 1 mid_width = np.full([m, rows], 0) for i in range(0, m): for j in range(0, array[i]): mid_width[i][j] = np.median(width[i]) print("\n中值平滑后的等宽箱：") print(mid_width) 输出结果与预期不符。帮我找出问题

3. 在第 10 行，您将 bins 列表初始化为 [min_value k*w for k in range(0, m 1)]，但这个表达式有语法错误。应该改为 [min_value + k*w for k in range(0, m+1)]，这将生成 m+1 个边界，最后一个边界是数据...

bins = np.arange(n+2)是什么意思

这行代码应该是有语法错误的，应该是：bins = np.arange(n, 2) 它的意思是创建一个numpy数组，其中包含从n开始到2（不包括2）的一系列数字。例如，如果n为5，则bins将包含数组[5,4,3]。这通常用于定义直方图的bin...

Java串口开发包RXTX-2.1跨平台使用指南

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bins = np.arange(11) # hist, _ = np.histogram(d, bins=bins)

yolov5中y = ax[0].hist(c, bins=np.linspace(0, nc, nc + 1) - 0.5, rwidth=0.8)

分析 bins = np.arange(n+2)

bins = np.arange(n+2)是什么意思

Java串口开发包RXTX-2.1跨平台使用指南

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