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Matrix Manipulation Mastery

A Professional Reference for In-Place Algorithms

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1. Core Manipulation Primitives

Operation	Logic	Python Code Implementation
Diagonal Flip (Transpose)	Swap row/col across the main diagonal.	for i in range(n):`` for j in range(i + 1, n):`` matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]

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  #!/bin/bash

 # This script archive 2 things here
 # 1. boot the fresh simulator once, so we can reduce the boot time in UI test
 # 2. Simulator shows swipe tutorial on first use of keyboard (iOS13 above), this script will set simulator preferences so it wont show the tutorial

  function get_simulator_udid() {
    echo '' | xcrun simctl list devices | grep "iPhone" | grep -v "unavailable" | awk -F "[()]" '{ for (i=2; i<NF; i+=2) print $i }' | grep '^[-A-Z0-9]*$' 
  }

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2020-03-03 15:49:44.579009-0800 WebDriverAgentRunner-Runner[13001:2373474] The following attributes were requested to be included into the XML: {(
    FBEnabledAttribute,
    FBVisibleAttribute,
    FBXAttribute,
    FBYAttribute,
    FBWidthAttribute,
    FBHeightAttribute,
    FBTypeAttribute,
    FBValueAttribute,
    FBNameAttribute,

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# Redirect console output to a file and display on console at the same time.
bundle exec fastlane <your_lane_here> --verbose 2>&1 | tee /path/to/logfile.txt

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# Install snapshot gem
gem install snapshot

# Reset all the simulators
fastlane snapshot reset_simulators

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# to list the sessions and their status
screen -ls

# to start a session with a given name. The name should be unique
screen -S session_name

# to start a session without going into it
screen -dmS session_name /path/to/script/file.sh

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erase_sim:
	./reset_sim.sh 2>/dev/null; true

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// Copied from https://stackoverflow.com/a/49944637

import XCTest

enum TestSwipeDirections {
    case up
    case down
    case left
    case right
}

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extension XCUIApplication {
    private struct Constants {
        // Half way accross the screen and 10% from top
        static let topOffset = CGVector(dx: 0.5, dy: 0.1)

        // Half way accross the screen and 90% from top
        static let bottomOffset = CGVector(dx: 0.5, dy: 0.9)
    }

    var screenTopCoordinate: XCUICoordinate {

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With JQ installed - output of this command is string with quotes

xcrun simctl list --json | jq '.devices["iOS 12.0"] [] | select(.name=="iPhone X") | .udid'

With JQ if you don't want quotes