ELI (programming language): Difference between revisions

Revision as of 01:49, 3 December 2019

Revision as of 10:06, 25 July 2020

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Exclamation point (!) is an interval function. It can generate a vector of n integer from 1 to n.

<sourcesyntaxhighlight lang="text">

!10

1 2 3 4 5 6 7 8 9 10

</syntaxhighlight>

</source>

The execution order of ELI is from right to left, and all primitive functions have equal precedence.

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5 * 2 + 10 // from right to left, 5 * (2 + 10)

60

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In the next example a function <code>add</code> is declared in a short function form. The arguments of the function can be either a scalar or a vector.

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{add: x+y} // short function form

add

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1 add !10 // 1+(1..10)

2 3 4 5 6 7 8 9 10 11

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</source>

The <code>$</code> rotation operator returns the reverse order of a vector.

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$!10 // reverse

10 9 8 7 6 5 4 3 2 1

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A 2-by-3 matrix (or higher dimension array, e.g., <code>2 3 4#!24</code>) can be generated by <code>#</code> with left argument <code>2 3</code>.

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2 3#!6 // 2 dimension array (matrix)

1 2 3

4 5 6

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In first line below the <code>x</code> is assigned with a vector from 1 to 20. Then, <code>1 = 2|x</code> returns odd number <code>True</code> and even number <code>False</code>. The <code>/</code> is a primitive function for compression which '''picks up''' the value in <code>x</code> corresponding to the <code>True</code> values in its left argument.

<sourcesyntaxhighlight lang="text">

x <- !20 // 1..20

x

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(1 = 2|x) / x // get odd numbers from x

1 3 5 7 9 11 13 15 17 19

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==File extensions==

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An ELI file with extension <code>.esf</code> is a script file which contains all methods and data. A simple way to create a script file is using the command <code>)out</code>. However, a clean workspace with no debugging or error information left is needed before a script file can be created. Later the command <code>)fload</code> can be used to reload the script file.

<sourcesyntaxhighlight lang="text">

)out MyScript

)lib

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)fload MyScript

saved 2017.02.17 10:23:55 (gmt-5)

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An ELI file with extension <code>.eli</code> is an ELI workspace file which contains everything in a workspace. <code>save</code> and <code>load</code> are commands for workspace files.

<sourcesyntaxhighlight lang="text">

)save MyWorkspace

)load MyWorkspace

saved 2017.02.17 10:57:19 (gmt-5)

</syntaxhighlight>

</source>

==References==