APL | UTF8 APL interpreter | Interpreter library

by droyo C Version: Current License: No License

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | APL Summary

APL is a C library typically used in Utilities, Interpreter applications. APL has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

This project is my endeavour to create an open-source APL interpreter that is useful for every-day use. I want this interpreter to be used much in the same way as 'awk' is used in the Unix environment; for one-off scripts, to poke and prod at data. To this end, I have the following design goals in mind:.

Support

Quality

Security

License

Reuse

Support

APL has a low active ecosystem.

It has 21 star(s) with 0 fork(s). There are 6 watchers for this library.

It had no major release in the last 6 months.

APL has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of APL is current.

Quality

APL has no bugs reported.

Security

APL has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

APL does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

APL releases are not available. You will need to build from source code and install.

Installation instructions, examples and code snippets are available.

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APL Key Features

No Key Features are available at this moment for APL.

APL Examples and Code Snippets

No Code Snippets are available at this moment for APL.

Community Discussions

Trending Discussions on APL

Python-Networkx Graph Generating Function - For Loop

Why does reduce operator does not work the way I expect it to?

Converting function identifier to string

How can I extract multiple elements from a matrix in an APL tacit function?

How do I save Dyalog APL functions in a text file?

Filtering in numpy array

Implementation of a function object "power" operator in Raku

Read FITS files

Write 4 : 'x&{.&.;: y' tacitly

Unexpected recursive behavior in Java

QUESTION

Python-Networkx Graph Generating Function - For Loop

Asked 2021-Jun-10 at 04:19

I have created a function to generate 100 random graphs in Networkx, and I want the output to be the graph list, as well as a couple of functions run on each generated graph (the diameter, transitivity, and average shortest path length). My output seems to be iterating on the same first generated graph, instead of through each sample graph generated. I am new to programming and believe it has to do with the structure of my loop, but appreciate any advice though I know the answer is likely basic. I am using Python 3.9 and NetworkX 2.5

...

ANSWER

Answered 2021-Jun-10 at 04:19

This is a subtle bug, but the issue is this line:

Source https://stackoverflow.com/questions/67913800

QUESTION

Why does reduce operator does not work the way I expect it to?

Asked 2021-Jun-05 at 22:42

I am trying to solve Euler 18 in Dyalog APL, and I am not able to understand why my solution does not work.

The problem is as follow:

By starting at the top of the triangle below and moving to adjacent numbers on the row below, the maximum total from top to bottom is 23.

...

ANSWER

Answered 2021-Jun-05 at 15:07

/ works in the reverse way to what you expected - it evaluates through the array right-to-left.

F/a b c d is ⊂a F b F c F d, or, with parentheses, ⊂(a F (b F (c F d))).

After removing the ⌽ and swapping ⍺ and ⍵, you get {⍺+(2⌈/⍵),0}/d, which gives the result you want.

Source https://stackoverflow.com/questions/67844794

QUESTION

Converting function identifier to string

Asked 2021-Jun-02 at 07:55

If I have a vector of functions in APL, is there a way to get a vector of the function names as strings? I have tried DISPLAY and ⍕ without successs:

...

ANSWER

Answered 2021-Jun-02 at 07:55

Unfortunately, APL is not a functional language, so there is no such thing as an array of functions.

What you have in functions is an 2-train or atop: https://apl.wiki/atop

DISPLAY functions then becomes an atop of an atop (f(g h))⍵ and DISPLAY⍕functions is a 3-train or fork: https://apl.wiki/fork

One way you can get close in Dyalog APL is an array of namespaces that all contain similarly named functions. Then you can call all of the functions with the same arguments in one call:

Source https://stackoverflow.com/questions/67791767

QUESTION

How can I extract multiple elements from a matrix in an APL tacit function?

Asked 2021-Jun-01 at 13:33

(Dyalog) APL learner question

If I have a matrix Y:

...

ANSWER

Answered 2021-Jun-01 at 13:30

(1 1)(2 2)⌷¨⊂Y

Source https://stackoverflow.com/questions/67789517

QUESTION

How do I save Dyalog APL functions in a text file?

Asked 2021-May-29 at 23:02

I have the following APL Functions which I want to save in a .dyalog file:

...

ANSWER

Answered 2021-May-29 at 05:41

The Dyalog editor is designed to edit a single item (function, operator, namespace script) at a time - it cannot be used to define two functions at once unless you embed them in a namespace. Your choices are:

Enter those two lines into the APL session, and then create two .dyalog files using:

Source https://stackoverflow.com/questions/67747785

QUESTION

Filtering in numpy array

Asked 2021-May-05 at 09:13

Want to filter numpy array based on a condition with using only numpy

...

ANSWER

Answered 2021-May-05 at 09:13

sample = ["aple", "mangp", "orange"]
np.where(["p" in s for s in sample])

Source https://stackoverflow.com/questions/67397985

QUESTION

Implementation of a function object "power" operator in Raku

Asked 2021-May-04 at 20:23

In APL there is the power operator ⍣, which if applied to a function f superimposes the application of f. How to implement that operator in Raku?

For example, with this definition of f:

...

ANSWER

Answered 2021-May-01 at 21:28

How one should extend or replace it with a better implementation that works on multiple (or any) signatures?

Raku actually has an operator that's not too far away from the APL's ⍣ built in: xx, the list repetition operator. (Lists of functions are still lists, after all!). Using xx, we can define ⍣ in a single line:

Source https://stackoverflow.com/questions/67346926

QUESTION

Read FITS files

Asked 2021-Apr-19 at 07:57

I have some experience in several programming languages, but I would like to try APL. I'm doing some tutorials, but I want to work in a practical example. I would like to read astronomical images from a file, in FITS format (a very common format for Astronomy data), and perform some calculations on them. An image is nothing but a big numerical matrix (mine are integers, but they could be doubles... this is not important, anyway). And each file can have one or several images (not only that, but also tables and metadata information). Once one of the images is loaded, a function with some computations would be applied to it.

I would like to know whether there is any library or package for APL with functions to perform this FITS file handling (reading, writing, modification, retrieval or change of metadata, extension, etc.), or if I should use a kind of wrapper using any other language (C, C++, Python, ...) with well established libraries to perform all the input/output, with a computational core in APL.

(I quick search in Google and in some APL oriented sites didn't yield to any valid result.)

...

ANSWER

Answered 2021-Apr-19 at 07:33

I don't know of such a library in APL, although it should be fairly easy to implement.

Dyalog APL can fairly easily use FITS libraries from other languages:

Language Inteface C and C++ ⎕NA C# and .NET ⎕USING Python Py'n'APL R rconnect

Source https://stackoverflow.com/questions/67153252

QUESTION

Write 4 : 'x&{.&.;: y' tacitly

Asked 2021-Apr-06 at 20:50

Conor Hoekstra recently solved a Leetcode problem in APL https://youtu.be/QtvvQ7MdwKY The problem is to take the first x words from a character string y

In J, using &. (Under) and ;: (Words) I can come up with a nice explicit one liner

...

ANSWER

Answered 2021-Apr-06 at 06:24

mainly because I believe x needs to be bound to {. during the creation of the verb.

If creating a verb with an input is the key, shouldn't you use an adverb?

Source https://stackoverflow.com/questions/66963366

QUESTION

Unexpected recursive behavior in Java

Asked 2021-Apr-03 at 16:43

public class Main21 {

    static int count=0;
    
    public static void printer(String s, int n, int sz){
        
        if(n>sz-1)
            return;
       String s1=s+"P";
       String s2=s+"A";
       String s3=s+"L";
       
       if(s1.length() == sz && s2.length() == sz && s3.length() == sz){
           
               if( !s1.contains("AA") && !s1.contains("LLL") && !s2.contains("AA") && !s2.contains("LLL") && !s3.contains("AA") && !s3.contains("LLL") )
               {
                   System.out.print(s1+" "+s2+" "+s3+" ");
                   count++;
               }
       }         
       printer(s1,n+1,sz);
       printer(s2,n+1,sz);
       printer(s3,n+1,sz);
    
    }
    public static void main(String[] args) {
        int sz=2 ;
        printer("P",1,sz);
        printer("A",1,sz);
        printer("L",1,sz);
        
        System.out.println("\n"+count*3);
    }

}

...

ANSWER

Answered 2021-Apr-03 at 16:43

I think the problem is that when you check the strings you skip printing all of them even if only one of the three is invalid.

Here's possible solution that also removes some duplicated code:

Source https://stackoverflow.com/questions/66928726

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install APL

awk
make (GNU or BSD)
C compiler (tcc and gcc are used for development)
libbio,libfmt,libutf
You may need to tweak the CC,LD,CFLAGS and LDFLAGS variables in the Makefile. Also, if your C compiler does not support flexible array members like the example. You'll need to tweak the declaration for array and ASIZE in apl.h. The source is developed using gcc and tcc, on both x86 and x86_64 platforms.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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