lined from 'blobmsg_new' at /home/ebyte/TX2063/openwrt/build_dir/hostpkg/libubox-2018-07-25-c83a84af/blobmsg.c:198:2:

这个错误信息提供的不够完整，只有一行代码。但是根据这行代码可以猜测可能是在使用某个函数时出错了，函数名可能是 `blobmsg_new`，文件路径可能是 `/home/ebyte/TX2063/openwrt/build_dir/hostpkg/libubox-2018-07-25-c83a84af/blobmsg.c`，行号可能是 `198`。需要查看更多的代码和错误信息才能确定问题的具体原因。

相关问题

代码输出的结果declare lines number :=5; begin FOR i IN 1..lines LOOP if i< lines /2+1 then dbms_output.put_line( lpad('*', 2*i -1, '*')); else dbms_output.put_line(lpad(' ', 2*(i -1)-(lined/2+1)|| lpad('*', 2*(lines - i)+1, '*')); end if; END LOOP; end;

抱歉，这段代码存在语法错误，无法执行。其中的 `lined` 变量未定义，应该是 `lines`。此外，第 6 行的 `lpad(' ', 2*(i -1)-(lined/2+1)|| lpad('*', 2*(lines - i)+1, '*')` 也存在错误，应该改为 `lpad(' ', 2*(i -1)-(lines/2+1)) || lpad('*', 2*(lines - i)+1, '*')`。修改后的代码如下：

declare
  lines number := 5;
begin
  for i in 1..lines loop
    if i < lines / 2 + 1 then
      dbms_output.put_line(lpad('*', 2*i - 1, '*'));
    else
      dbms_output.put_line(lpad(' ', 2*(i - 1) - (lines/2 + 1)) || lpad('*', 2*(lines - i) + 1, '*'));
    end if;
  end loop;
end;

这段代码的功能是输出一个菱形图案，示例输出如下：

*
***
*****
 ***
  *

这个代码我可以添加一个列表，并且在画图时显示，用户通过一个下拉式的项目栏点击可以确定field_name的值，完整代码

好的，你可以试试下面的代码，我添加了一个列表 `field_name_list`，用户可以通过下拉式的项目栏来选择 `field_name` 的值。代码中还添加了一些注释方便理解。如果有问题可以随时问我。

import os
import math
import json
import operator
import matplotlib.pyplot as plt
import re
from tkinter import *

def get_filenames(folder_path):
    """get filename"""
    json_files = []
    for file in os.listdir(folder_path):
        if file.endswith('.json'):
            json_files.append(file)
    return json_files

def get_id_velocity(json_files, id_num, field_name):
    """Read the json file to find the value corresponding to the field name"""
    x_list=[]
    y_list=[]
    name_list = []
    for file in json_files:
        with open(os.path.join(folder_path, file), 'r') as f:
            data = json.load(f)
            obstacles = data.get('obstacles')
            if obstacles:
                for obstacle in obstacles:
                    if obstacle['id']== id_num:
                        field_value = obstacle.get(field_name)
                        if field_value == None:
                            return x_list,y_list,name_list
                        x_list.append(field_value['x'])
                        y_list.append(field_value['y'])
                        name_list.append(file)
    return x_list,y_list,name_list

def get_field_name(event):
    """get field name from dropdown list"""
    global field_name
    field_name = variable.get()

if __name__ == '__main__':
    # create tkinter window
    root = Tk()
    root.title("Display based on user input")

    # create dropdown list for field name
    field_name_list = ['field_name1', 'field_name2', 'field_name3', 'field_name4']
    variable = StringVar(root)
    variable.set(field_name_list[0])
    variable.trace("w", get_field_name)
    w = OptionMenu(root, variable, *field_name_list)
    w.pack()

    # create plot figure
    fig, ax = plt.subplots()
    plt.title("display based on user input")

    while True:
        folder_path = 'front_middle_obs'
        id_num = int(input('请输入要显示的id号,输入0退出:'))
        if id_num == 0:
            print("exit")
            break

        # get field name from dropdown list
        field_name = variable.get()

        json_files = get_filenames(folder_path=folder_path)
        json_files.sort(key=operator.methodcaller("lower"))
        x_list,y_list,name_list=get_id_velocity(json_files=json_files, id_num=id_num, field_name=field_name)
        if len(x_list)==0:
            print(f'请确定你的输入无误,我没有找到你输入的id:{id_num}对应的字段名:{field_name}')
            continue

        # calculate velocity
        list3 = []
        for i in range(len(x_list)):
            value = math.sqrt(x_list[i] ** 2 + y_list[i] ** 2)
            list3.append(value)
        new_name_lst = list(range(len(name_list)))
        x=[]
        for file_name in name_list:
            num = re.findall(r'\d+', file_name)[0]
            x.append(num)

        # plot curves
        ax.plot(new_name_lst, x_list,label='velocity_x',linewidth=2)
        ax.plot(new_name_lst, y_list, label='velocity_y',linewidth=2)
        ax.plot(new_name_lst, list3, label='velocity',linewidth=2)

        # set x-axis label
        ax.set_xticks(new_name_lst)
        ax.set_xticklabels(x)

        # set legend
        leg = ax.legend(loc='upper left', fancybox=True, shadow=True)
        leg.get_frame().set_alpha(0.5)

        # set line picker
        lines = [l for l in ax.lines]
        lined = dict()
        for legline, origline in zip(leg.get_lines(), lines):
            legline.set_picker(True)
            lined[legline] = origline

        def onpick(event):
            """visibility"""
            legline = event.artist
            origline = lined[legline]
            visible = not origline.get_visible()
            origline.set_visible(visible)
            if visible:
                legline.set_alpha(1.0)
            else:
                legline.set_alpha(0.2)
            fig.canvas.draw()

        fig.canvas.mpl_connect('pick_event', onpick)

        # show plot
        plt.show()

    # close tkinter window
    root.destroy()