小编JC.*_*JC.的帖子

从借款例如在Matplotlib文档页面上,并稍微修改代码,

import numpy as np
from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt

def randrange(n, vmin, vmax):
    return (vmax-vmin)*np.random.rand(n) + vmin

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
n = 100
for c, m, zl, zh in [('r', 'o', -50, -25), ('b', '^', -30, -5)]:
    xs = randrange(n, 23, 32)
    ys = randrange(n, 0, 100)
    zs = randrange(n, zl, zh)
    cs = randrange(n, 0, 100)
    ax.scatter(xs, ys, zs, c=cs, marker=m)
ax.set_xlabel('X Label')
ax.set_ylabel('Y Label')
ax.set_zlabel('Z Label')

plt.show()

将给出每个点具有不同颜色的3D散点图(在该示例中为随机颜色).将颜色条添加到图中的正确方法是什么,因为添加 …

有了这个

PROCEDURE "ADD_BOOKMARK_GROUP" (
  "NAME" IN VARCHAR2, 
  "BOOKMARK_GROUP_ID" IN NUMBER, 
  "STAFF_ID" IN VARCHAR2,
  "MAX_NO" IN INT,
  "NUMFOUND" OUT INT, 
  "NEW_ID" OUT NUMBER) IS

BEGIN

NEW_ID := -1;

SELECT COUNT(*) INTO NUMFOUND FROM BOOKMARK_GROUP_TABLE WHERE STAFF_ID = STAFF_ID;

IF NUMFOUND < MAX_NO THEN
    INSERT INTO BOOKMARK_GROUP_TABLE (NAME, BOOKMARK_GROUP_ID, STAFF_ID) VALUES(NAME, BOOKMARK_GROUP_ID, STAFF_ID);
    SELECT BGT_SEQUENCE.currval INTO NEW_ID FROM dual;
END IF;
END;

我觉得有趣的是,如果我不按照定义的顺序添加参数,例如

OracleCommand cmd = new OracleCommand("ADD_BOOKMARK_GROUP", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new OracleParameter("NAME", name));
...
cmd.Parameters.Add(new OracleParameter("NEW_ID", OracleDbType.Decimal)).Direction = ParameterDirection.Output;
cmd.Parameters.Add(new …

为什么基于比较的排序算法O(n log n)的时间复杂度的下限？