mhamilt

Modes

• Parameter Expansion: ${}
• Command Substitution: $()
• Arithmetic Expansion: $(())

Examples

Parameter Expansion

mhamilt

# declares an array with the emojis we want to support
EMOJIS=("🐑" "🦔" "🐈" "🦆" "🐓")

# function that selects and return a random element from the EMOJIS set
RANDOM_EMOJI() {
  SELECTED_EMOJI=${EMOJIS[$RANDOM % ${#EMOJIS[@]}]};
  echo $SELECTED_EMOJI;
}

# declare the terminal prompt format

mhamilt

#include <ApplicationServices/ApplicationServices.h>
#include <iostream>
#include <string>

///print out location in a nice way to std cout
void fancyPrintLocation(CGPoint location);

/// This callback will be invoked every time the mouse moves.
CGEventRef myCGEventCallback(CGEventTapProxy proxy, CGEventType type,
                  CGEventRef event, void *refcon)

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[])
{