mhamilt

function out = autocorrolate(signal)
% AUTOCORROLATE  Multiply a signal by itself over a moving delay window.
% Max delay will be equal to the length of the signal
%   Y = AUTOCORROLATE(x) returns auto correlation of x
%
	N = length(signal);
	out = zeros(size(signal));
	for l = 1:N - 1
		for n = l+1:(N)
			out(l) = out(l) + (signal(n)*signal(n-l));

mhamilt

Copy and Paste or create a code snippet in xcode

Access snippets in Xcode with ⇧⌘L

/*!
 @class <#Class Name#>
 @brief <#Quick Description#>
 @discussion <#Talk about what this does in more detail#>
 @namespace &lt;#What is the Namespace if any#&gt;

mhamilt

//------------------------------------------------------------------------------
import AVFoundation
//------------------------------------------------------------------------------
var secondsOfAudio:Float = 0.5; // or var secondsOfAudio:Float = Float(CommandLine.arguments[1])!;
//------------------------------------------------------------------------------
var ae:AVAudioEngine? = AVAudioEngine()
var player:AVAudioPlayerNode? =  AVAudioPlayerNode()
var mixer:AVAudioMixerNode? = ae?.mainMixerNode;
//------------------------------------------------------------------------------
let sr:Float = Float((mixer?.outputFormat(forBus: 0).sampleRate)!)

mhamilt

import csv, os


def add_csv_column(filename: str, column_name: str, data: list) -> None:
    """
    Add a column of data to an existing csv file

    pads with empty string if data size does not match target csv

    :param filename: path to csv file

mhamilt

Notes

Create a command line target in xcode either in Swift or Obj-C. add a metal file to the project and copy and paste the respective code into each file.

mhamilt

Paralell Data Processing with Metal

Build Instructions

Create a Swift Command Line Tool in Xcode. You can then copy and paste the below code into the .swift and .metal files respectively

Source

main.swift

mhamilt

#include <iostream>
#include <memory>

void setPtr (int *a)
{
    std::cout << *a << '\n';
}

int main(int argc, const char * argv[])
{

mhamilt

FFMPEG: Generate Gif

See This SO Article

And Here

# verbose, but customisable
ffmpeg -i VIDEO.EXTENSION  -vf "fps=10,scale=680:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 OUT.gif
# gritty, but portable

mhamilt

macOS Multi Display Sync: VLC

This brief script came about from numerous requests to play multiple videos in sync with each other from a single machine. The videos were to have different content but would be of the same duration. Achieving this on macOS has proved to be a little tricky to say the least. It is possible to run multiple instance of VLC so that videos can be played concurrently from the same machine.

Be aware that this method does not enforce any syncing, so it is possible for the videos to fall out of sync, especially if the are not exactly the same frame count and encoding.

Further reading

If precision is required you may want to invest in a ocuple of Rapsberry Pis and check out the following

mhamilt

import Foundation
import Cocoa

for screen in NSScreen.screens
{
    print(screen.deviceDescription[NSDeviceDescriptionKey("NSScreenNumber")]!);
}