Common Patterns: Difference between revisions
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'''Primitives''': [[plus]], [[over]] |
'''Primitives''': [[plus]], [[over]] |
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=== Deltas === |
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<code>-':</code> |
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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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<code>-':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> |
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<code>-':5 2 4 8 -> 5 -3 2 4</code> |
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<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> |
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<code>/the difference is highlighted here: |
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-':6 7 8 -> 6 1 1</code> |
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'''Dialects''': all, syntax may vary |
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'''Primitives''': [[eachp]], [[minus]] |
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Revision as of 19:54, 28 July 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.
Patterns
Sum
+/
Description: function to sum an array. Can be used with initial value.
Examples
+/1 2 3 4 5 -> 15
+/(1 2;2 3) -> 3 5
Dialects: all
Deltas
-':
Description: Function to find the differences between members of an array. Comes in various flavors.
Examples
-':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
-':5 2 4 8 -> 5 -3 2 4
{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
/the difference is highlighted here:
-':6 7 8 -> 6 1 1
Dialects: all, syntax may vary