leetschau

---
title: "二次型系统的参数估计和异常检测"
output: html_notebook
---

二次型系统（[Quadratic form](https://en.wikipedia.org/wiki/Quadratic_form)）是只包含二次项，不包含常数和一次项的单变量或者多变量系统，例如下面分别是包含1, 2 和 3个特征变量的二次型系统：
$$
y = a x^2 \\
y = a x^2 + b xy + c y^2 \\
y = a x^2 + b y^2 + c z^2 + d xy + e xz + f yz

leetschau

import numpy as np
import matplotlib.pyplot as plt

import pywt

original = pywt.data.camera()

noiseSigma = 16.0
image = original + np.random.normal(0, noiseSigma, size=original.shape)

leetschau

Let $$ \begin{align} ss_{xy} = \sum(x_i - \bar x) (y_i - \bar y) \tag 1 \end{align} $$

leetschau

import pandas as pd
import numpy as np

# based on [Pandas Pivot Table Explained](http://pbpython.com/pandas-pivot-table-explained.html)

# basic pivot table function

df = pd.read_excel('./sales-funnel.xlsx')
df['Status'] = df['Status'].astype('category')
df['Status'].cat.set_categories(["won", "pending", "presented", "declined"], inplace=True)

leetschau

def meta = '''
{
    "img": "../../../../static/img/treeImg/project.png",
    "name": "财务预算",
    "id": "1510126562947",
    "open": true,
    "level": 0,
    "select": false,
    "dictoryList": [
        {

leetschau

openapi: '3.0.0'

info:
  title: BOMS API
  description: BOMS API Specification
  version: "0.1.1"

servers:
  - url: localhost:8080
    description: test server

leetschau

leetschau

#!/usr/bin/env python3
import os, sys, re, subprocess

group_id = 'com.fr'
repo_id = 'znbt'
repo_url = 'http://192.168.12.233:8081/repository/znbt/'
sample_settings = '''<settings>
  <servers>
    <server>
      <id>znbt</id>

leetschau

#!/bin/sh
# From: http://stackoverflow.com/a/34054903/701420
# Simple script that will display docker repository tags.
#
# Usage:
#   $ docker-show-repo-tags.sh ubuntu centos
for Repo in $* ; do
  curl -s -S "https://registry.hub.docker.com/v2/repositories/library/$Repo/tags/" | \
    sed -e 's/,/,\n/g' -e 's/\[/\[\n/g' | \
    grep '"name"' | \

leetschau

import os
import subprocess

basedir = '/home/leo/.donno/repo'
notebook = 'dsnote'

err_coll = []
for fn in os.listdir(basedir):
    print('upload %s' % fn)
    fullname = os.path.join(basedir, fn)