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Common Patterns (edit)

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If you would like to add to this list, modify the template given in [[Format: Common Pattern]] and paste it in.
 
== PatternsSum ==
 
=== Sum ===
<code>+/</code>
 
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'''Examples'''
<codepre>+/1 2 3 4 5 -> 15</code>
+/(1 2;2 3)</pre>[https://ngn.bitbucket.io/k/#eJxLs6pOUDCwSshWqKjl4kpz0NY3VDBSMFYwUTAF8zSAXGuggCYA1kYJFw== ngn/k]
<code>+/(1 2;2 3) -> 3 5</code>▼
 
'''Dialects''': all
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'''Primitives''': [[plus]], [[over]]
 
=== Deltas ===
<code>-':</code>
 
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'''Examples:'''
 
<codepre>-':1 2 3 4 -> 1 1 1 1 /the builtin eachp prepends an array with zero before evaluation, so the output is the same size</code>
 
<code>-':5 2 4 8 -> 5 -3 2 4</code>
 
<code>{y/(1_;-1_)@\:x}[6 7 8;-] -> 1 1 /you can substitute the default eachp with your own for different behaviour, like this shakti example that just evaluates over each pair in x without prepending 0</code>
 
-':6 7 8 /the difference is highlighted here</pre>[https://ngn.bitbucket.io/k/#eJw1kMFuwjAQRO98xdzaSkRAS1sULvxHW8Em2eAtwY7sNQQQ/14nJQdb2l175s3W+W2Heb47oLtPJvUme8oXeMUblpipYRRRGhULptK0aD23bKsAsiDv6YKzqMGVvUPBtfMMPlETScXZKYJDr+GitlEhYagCHdMlV37YvSe7JVZ9dbvMnhfbdbbYvmy+8+7+9YFPrNbZD2YXF1Em1xCLoKJReRCruKbY6ANvgEkvPdzZIuGgkrpmz1YTnqGTpNkUjRz634knGDqogDs6tk3fI8VvDDqm4AB3Yj/IoyXxSKvoBp8UalyH2D3mjzQDMf53N5qX3Gc3sjdNOsoVTGr/AWGNf3M= ngn/k]
<code>-':6 7 8 -> 6 1 1 /the difference is highlighted here</code>
 
'''Dialects''': all, syntax may vary
 
'''Primitives''': [[each prior|eachp]], [[minus]]
 
== Rotate 90 degrees left ==
▲<code>|+/(1 2;2 3) -> 3 5:</code>
 
'''Description:''' function which rotates a matrix 90 degrees left(counterclockwise).
 
'''Example'''
 
<pre>|+3 3#!9</pre>[https://ngn.bitbucket.io/k#eJyr0TZWMFZWtAQACJcBqw== ngn/k]
 
'''Dialects''': all
 
'''Primitives''': [[transpose]], [[reverse]]
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