Common Patterns: Difference between revisions
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This page is intended as a list of commonly used snippets and functions that can be used in K code. |
This page is intended as a list of commonly used snippets and functions that can be used in K code. |
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If you would like to add to this list, modify the template given in [[Format: Common Pattern]]. |
If you would like to add to this list, modify the template given in [[Format: Common Pattern]] and paste it in. |
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== |
== Sum == |
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==== Sum ==== |
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<code>+/</code> |
<code>+/</code> |
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'''Examples''' |
'''Examples''' |
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< |
<pre>+/1 2 3 4 5 |
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+/(1 2;2 3)</pre>[https://ngn.bitbucket.io/k/#eJxLs6pOUDCwSshWqKjl4kpz0NY3VDBSMFYwUTAF8zSAXGuggCYA1kYJFw== ngn/k] |
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| ⚫ | |||
'''Dialects''': all |
'''Dialects''': all |
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'''Primitives''': [[plus]], [[over]] |
'''Primitives''': [[plus]], [[over]] |
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== Deltas == |
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| ⚫ | |||
'''Description:''' Function to find the differences between members of an array. Comes in various flavors. |
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'''Examples:''' |
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<pre>-':1 2 3 4 /the builtin eachp prepends an array with zero before evaluation, so the output is the same size |
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-':5 2 4 8 |
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{y/(1_;-1_)@\:x}[6 7 8;-] /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 |
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-':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] |
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'''Dialects''': all, syntax may vary |
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'''Primitives''': [[each prior|eachp]], [[minus]] |
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== Rotate 90 degrees left == |
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<code>|+:</code> |
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'''Description:''' function which rotates a matrix 90 degrees left(counterclockwise). |
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'''Example''' |
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<pre>(|+:)@3 3#!9</pre>[https://ngn.bitbucket.io/k#eJyr0TZWMFZWtAQACJcBqw== ngn/k] |
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'''Dialects''': all |
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'''Primitives''': [[transpose]], [[reverse]] |
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Latest revision as of 02:49, 7 September 2021
This page is intended as a list of commonly used snippets and functions that can be used in K code.
If you would like to add to this list, modify the template given in Format: Common Pattern and paste it in.
Sum[edit]
+/
Description: function to sum an array. Can be used with initial value.
Examples
+/1 2 3 4 5 +/(1 2;2 3)
Dialects: all
Deltas[edit]
-':
Description: Function to find the differences between members of an array. Comes in various flavors.
Examples:
-':1 2 3 4 /the builtin eachp prepends an array with zero before evaluation, so the output is the same size
-':5 2 4 8
{y/(1_;-1_)@\:x}[6 7 8;-] /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
-':6 7 8 /the difference is highlighted hereDialects: all, syntax may vary
Rotate 90 degrees left[edit]
|+:
Description: function which rotates a matrix 90 degrees left(counterclockwise).
Example
(|+:)@3 3#!9
Dialects: all