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      如何用颜色条替换线条图例

      How to replace lineplot legend with a colorbar(如何用颜色条替换线条图例)

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              1. 本文介绍了如何用颜色条替换线条图例的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                问题描述

                当我运行以下代码时,我得到一个图:

                    tmp = sns.lineplot(
                        data=inf_algs_results_df,
                        x='alpha',
                        y='runtime',
                        hue='beta_rounded',
                    )
                

                但是当我尝试用颜色条替换图例时,颜色条错误地反转了颜色!

                
                    tmp = sns.lineplot(
                        data=inf_algs_results_df,
                        x='alpha',
                        y='runtime',
                        hue='beta_rounded',
                    )
                    tmp.figure.colorbar(
                        mpl.cm.ScalarMappable(
                            norm=mpl.colors.Normalize(vmin=inf_algs_results_df['beta_rounded'].min(),
                                                      vmax=inf_algs_results_df['beta_rounded'].max(),
                                                      clip=False)),
                        label=r'$eta$')
                    plt.show()
                

                为什么翻转颜色栏,以及如何停止此操作?

                推荐答案

                您可以显式设置ScalarMappablelineplot的色彩映射表。这样两者使用相同:

                import matplotlib as mpl
                import matplotlib.pyplot as plt
                import seaborn as sns
                import pandas as pd
                import numpy as np
                
                alpha_range = np.arange(8)
                beta_range = np.arange(11)
                df = pd.DataFrame({'alpha': np.tile(alpha_range, len(beta_range)),
                                   'runtime': np.random.rand(len(alpha_range), len(beta_range)).cumsum(axis=0).ravel(),
                                   'beta': np.repeat(beta_range, len(alpha_range))})
                cmap = plt.get_cmap('rocket_r')
                ax = sns.lineplot(data=df,
                                  x='alpha',
                                  y='runtime',
                                  hue='beta',
                                  palette=cmap)
                cbar = ax.figure.colorbar(mpl.cm.ScalarMappable(norm=mpl.colors.Normalize(vmin=df['beta'].min(),
                                                                                          vmax=df['beta'].max(),
                                                                                          clip=False),
                                                                cmap=cmap),
                                          ticks=np.arange(df['beta'].min(), df['beta'].max() + 1),
                                          label=r'$eta$')
                # cbar.ax.invert_yaxis()  # optionally invert the yaxis of the colorbar
                # ax.legend_.remove()  # for testing purposes don't yet remove the legend
                plt.tight_layout()
                plt.show()
                

                这篇关于如何用颜色条替换线条图例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跟版网!

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