Knit 1, Perl 1

@maccath | Katy Ereira | #PHPSC17 Knit 1, Perl 1
Where Knitting & Programming Intertwine

@maccath | Katy Ereira | #PHPSC17 Programming is... Writing a
set of instructions that when run on certain hardware perform manipulations and calculations that produce a desired result

@maccath | Katy Ereira | #PHPSC17 Knitting is... Following a
set of instructions using certain needles and yarn to perform manipulations that produce a desired result

@maccath | Katy Ereira | #PHPSC17 Seeing a pattern?

@maccath | Katy Ereira | #PHPSC17 Ok; so knitting is
more like computing than programming.

@maccath | Katy Ereira | #PHPSC17 But like computer programs,
knitting patterns are a set of instructions.

@maccath | Katy Ereira | #PHPSC17 These can be represented
in different ways; many of which draw parallels with computer code.

@maccath | Katy Ereira | #PHPSC17 Unravelling the Mystery

@maccath | Katy Ereira | #PHPSC17

@maccath | Katy Ereira | #PHPSC17 Worked over even number
of sts. Row 1: [yo, k2tog] rep. Row 2 & 4: k all sts. Row 3: [ssk, yo] rep. Rep rows 1-4 for pattern. Knitting pattern

of sts. Row 1: [yo, k2tog] rep. Row 2 & 4: k all sts. Row 3: [ssk, yo] rep. Rep rows 1-4 for pattern. Knitting pattern - variables

@maccath | Katy Ereira | #PHPSC17 sts rows

@maccath | Katy Ereira | #PHPSC17 sts = 12 row
= 5 row 1 row 2 row 3 row 4

of sts. Row 1: [yo, k2tog] rep. Row 2 & 4: k all sts. Row 3: [ssk, yo] rep. Rep rows 1-4 for pattern. Knitting pattern - conditionals

@maccath | Katy Ereira | #PHPSC17 sts = 12 row
= 5 row 1 row 2 row 3 row 4

of sts. Row 1: [yo, k2tog] rep. Row 2 & 4: k all sts. Row 3: [ssk, yo] rep. Rep rows 1-4 for pattern. Knitting pattern - iterators

@maccath | Katy Ereira | #PHPSC17 row = 5 %
4 = 1 row 1 row 2 row 3 row 4

of sts. Row 1: [yo, k2tog] rep. Row 2 & 4: k all sts. Row 3: [ssk, yo] rep. Rep rows 1-4 for pattern. Knitting pattern - methods

@maccath | Katy Ereira | #PHPSC17 Row = 5 %
4 = 1 Row 1 Row 2 Row 3 Row 4 k2tog yo yo k2tog

@maccath | Katy Ereira | #PHPSC17 Row = 6 %
4 = 2 Row 1 Row 2 Row 3 Row 4 Row 5

@maccath | Katy Ereira | #PHPSC17 Let’s Craft Some Code

@maccath | Katy Ereira | #PHPSC17 function pattern(array $sts, int
$rows) { if (count($sts) % 2 != 0) { throw Exception(“The number of stitches must be even!”); } // ... } Knitting pattern - pattern method, conditionals

$rows) { // ... for ($row = 1; $row <= $rows; $row++) { // ... } } Knitting pattern - pattern method, iterator

$rows) { // ... for ($row = 1; $row <= $rows; $row++) { if ($row % 2 == 0) { evenRow($sts); continue; } // ... } } Knitting pattern - pattern method, more conditions

$rows) { // ... for ($row = 1; $row <= $rows; $row++) { // ... if ($row % 4 == 1) { rowOne($sts); continue; } // ... } } Knitting pattern - pattern method, more conditions

$rows) { // ... for ($row = 1; $row <= $rows; $row++) { // ... rowThree($sts); } } Knitting pattern - pattern method, more conditions

@maccath | Katy Ereira | #PHPSC17 function evenRow($sts) { foreach
($sts as $st) { k($st); } } Knitting pattern - even round method

@maccath | Katy Ereira | #PHPSC17 function rowOne($sts) { for
($i = 0; $i < count($sts); $i += 2) { yo(); k2tog($sts[$i], $st[$i+1]); } } Knitting pattern - row one method

@maccath | Katy Ereira | #PHPSC17 function rowThree($sts) { for
($i = 0; $i < count($sts); $i += 2) { ssk($sts[$i], $st[$i+1]); yo(); } } Knitting pattern - third row method

@maccath | Katy Ereira | #PHPSC17 // Cast on 20
stitches $stitches = array_fill(0, 20, new Stitch()); // Knit for this many rows $rows = 10; // Let’s knit! pattern($stitches, $rows); Knitting pattern - usage!

@maccath | Katy Ereira | #PHPSC17 Charting a Course

@maccath | Katy Ereira | #PHPSC17 Credit: Hedgehog Fibres -
https://www.flickr.com/photos/29825916@N05/10784075824/

@maccath | Katy Ereira | #PHPSC17 4 O 3 2
O 1 O yo k2tog ssk k A Knitting Chart

@maccath | Katy Ereira | #PHPSC17 4 O 3 2
O 1 rows repeat pattern sts O yo k2tog ssk k key A Knitting Chart

@maccath | Katy Ereira | #PHPSC17 The Future is Looming

@maccath | Katy Ereira | #PHPSC17 Credit: Karen Blakeman -
https://www.flickr.com/photos/rbainfo/5427088569/

@maccath | Katy Ereira | #PHPSC17 Credit: smeech - https://www.flickr.com/photos/39554118@N08/13901738784/

@maccath | Katy Ereira | #PHPSC17 Credit: smeech - https://www.flickr.com/photos/39554118@N08/14349266009

@maccath | Katy Ereira | #PHPSC17 “ The term "Jacquard"
is not specific or limited to any particular loom, but rather refers to the added control mechanism that automates the patterning. The process can also be used for patterned knitwear and machine-knitted textiles, such as jerseys.

@maccath | Katy Ereira | #PHPSC17 “ [The] use of
replaceable punched cards to control a sequence of operations is considered an important step in the history of computing hardware. Jacquard's invention had a deep influence on Charles Babbage.

@maccath | Katy Ereira | #PHPSC17 Weaving Everything Together

@maccath | Katy Ereira | #PHPSC17 There are challenges faced
by knitters, which could be untangled through programming.

@maccath | Katy Ereira | #PHPSC17 Formalisation of Knitting Patterns
• Translation ◦ “I’d like this pattern to use abbreviations I understand.” • Charting ◦ “I’d like to convert this written pattern into a visual chart.” • Validation ◦ “Will this pattern work, or does it contain mistakes?”

@maccath | Katy Ereira | #PHPSC17 KnitML - http://www.k2g2.org/wiki:knitml

@maccath | Katy Ereira | #PHPSC17 Arithmetic and Calculations •
Sizing ◦ “How many rows do I need to knit to reach my correct size?” • Shaping ◦ “What stitches do I need to make in order to shape this garment to fit my body?” • Adaptation and alteration ◦ “What size needles should I use in order to knit with this thicker yarn?”

@maccath | Katy Ereira | #PHPSC17 Job Replacement • Test
knitting ◦ Programmatically knit the pattern and analyse the output; does it work, will it fit? • Technical editing ◦ Validate the pattern; spot knitting mistakes and standardise terminology. • Knitwear design ◦ Create knitting charts and garment templates; easy design & create patterns.

@maccath | Katy Ereira | #PHPSC17 There are difficulties faced
by programmers, which could be ironed out through knitting.

@maccath | Katy Ereira | #PHPSC17 Staying Sane • Stress
reduction / avoiding burnout ◦ Participating in a meditative hobby such as knitting can help you unwind • Solving difficult problems ◦ Performing a different activity can free your mind to come up with crafty solutions • Brain training ◦ Strengthen your intellectual fibre by exercising your brain

@maccath | Katy Ereira | #PHPSC17 Knit for Health and
Wellness - http://www.knitforhealthandwellness.com

@maccath | Katy Ereira | #PHPSC17 Indulge Your Geekiness •
Mathematical/Geometric Knitting ◦ Moebius scarves, non-orientable surfaces, klein bottles, pi shawl • Coded Knitting ◦ Encoding data in knitting • Fandom Knits ◦ Dr Who scarves, cosplay, geeky motifs

@maccath | Katy Ereira | #PHPSC17 Credit: birdfarm - https://www.flickr.com/photos/birdfarm/58097731

@maccath | Katy Ereira | #PHPSC17 Give Knitting a Spin!

@maccath | Katy Ereira | #PHPSC17 Yarning for more? Knitting
Help: http://www.knittinghelp.com/videos/learn-to-knit Craftsy knitting classes: http://www.craftsy.com/classes/knitting Knitty - free online knitting magazine: http://knitty.com Ravelry - social network and pattern library: http://ravelry.com k2g2 - “the convergence of brains and crafts”: http://www.k2g2.org

Knit 1, Perl 1

Knit 1, Perl 1

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