Question on converting array into sub-arrays

RE: Question on converting array into sub-arrays

Gregor Gisler-Merz — Thu, 07 Mar 2019 15:49:20 GMT

Use the following code snippet. Just add a arbitrary array and define the split size. Comes in extremely handy if you have massive data to tackle and want to save memory.

load(
local!loops: tointeger(length(ri!Ids)/10)+1,
local!indexIndicator: (enumerate(local!loops)+1)*10,

a!forEach(
local!indexIndicator,
with(
local!lowerIndex:fv!item-10,
local!upperIndex:fv!item,
a!forEach(ri!Ids,
if(and(fv!index>local!lowerIndex,fv!index<=local!upperIndex),
fv!item,
{})
)
)
)
)

RE: Question on converting array into sub-arrays

Chris — Tue, 09 Aug 2016 22:48:29 GMT

Great!

RE: Question on converting array into sub-arrays

mohamedb — Tue, 09 Aug 2016 22:47:06 GMT

Thank you Chris very much. The rules are working fine.

RE: Question on converting array into sub-arrays

Chris — Tue, 09 Aug 2016 22:25:09 GMT

I'll attach an export of the rules, if you would like to try importing them straight to your environment. We are on Appian 16.1.

Chris_Test - Patch.zip

RE: Question on converting array into sub-arrays

mohamedb — Tue, 09 Aug 2016 22:12:38 GMT

I still an empty list ...

RE: Question on converting array into sub-arrays

Chris — Tue, 09 Aug 2016 21:48:43 GMT

Sorry for a few typos, few notes:

rule!chris_pivotGetIndex_helper(num, separation, count)

should be:

rule!chris_pivotGetIndex_helper(num, separation, index)

rule!chris_pivotGetItems(array,index)

should be:

rule!chris_pivotGetItems(array,indexes)

Ensure in the last one above, array is multiple and indexes is not (single valued string). If the rest of the parameter types match from my initial post, you should be seeing data..

RE: Question on converting array into sub-arrays

mohamedb — Tue, 09 Aug 2016 20:54:32 GMT

@Appian: Drawing the Grid above is a straight forward nested loops in java. It is also a very common scenario. Is there an easy way to do the same in Appian?

RE: Question on converting array into sub-arrays

mohamedb — Tue, 09 Aug 2016 20:50:10 GMT

The parameters for each rule do not match the variables used in the rule. When I updated them to avoid an error, I got an empty array as a result.

RE: Question on converting array into sub-arrays

Chris — Tue, 09 Aug 2016 19:31:52 GMT

Hi mohamedb, the rules output the desired format in my environment - what results are you seeing?

RE: Question on converting array into sub-arrays

mohamedb — Tue, 09 Aug 2016 02:12:06 GMT

@csteward: Thanks for sharing. I have tried to test the rules shared but they didnot render the expected {a,d,g},{b,e,h},{c,f,i} output. I am thinking of another approach too. But, if we can get your solution to work it will be more dynamic. Hope that it worked when you tried it.

RE: Question on converting array into sub-arrays

Chris — Mon, 08 Aug 2016 22:31:40 GMT

To achieve the grid you want, you will be looking for arrays in this format instead, so each can be used as a column: {a,d,g},{b,e,h},{c,f,i}. This function below will handle a dynamic sized list and column count and perform a type of pivoting for you, returning an array of arrays in the desired format which you should be able to iterate through and generate your columns, give it a try:

rule!chris_pivot()

with(
local!array: {"a","b","c","d","e","f","g","h","i"},
local!columns: 3,
local!count: count(local!array),
local!indexes: apply(rule!chris_pivotGetIndex(separation: local!columns, num: _, count: _),
merge(
1+enumerate(local!columns),
apply(rule!chris_pivotGetSizes(max: local!count, size: local!columns, start: _), 1+enumerate(local!columns))
)
),
local!newArrays: apply(rule!chris_pivotGetItems(array: local!array, indexes: _),local!indexes),

local!newArrays
)

Helper Rules:

rule!chris_pivotGetIndex(num, separation, count) - inputs single valued integers:

joinarray(
apply(rule!chris_pivotGetIndex_helper(num: ri!num, separation: ri!separation, index: _), enumerate(ri!count))
,","
)

rule!chris_pivotGetIndex_helper(num, separation, count) - inputs single valued integers:

(ri!index * ri!separation) + ri!num

rule!chris_pivotGetSizes(max, start, size) - inputs single valued integers:

ceiling((ri!max+1-ri!start)/ri!size)

rule!chris_pivotGetItems(array,index) - both inputs text, 'array' is multiple:

index(ri!array,apply(fn!tointeger,split(ri!indexes,",")),null)

RE: Question on converting array into sub-arrays

mohamedb — Sat, 06 Aug 2016 08:03:14 GMT

*Construct grid from main array

RE: Question on converting array into sub-arrays

mohamedb — Sat, 06 Aug 2016 05:45:15 GMT

It will be a bit tricky constructing the sub-arrays from the main array using OOTB functions.

My goal is to construct the following grid from the main grid:
---------------------------------
column1 | column2 | column3 |
---------------------------------
a |b |c |
---------------------------------
d |e |f |
---------------------------------
g |h |i |
---------------------------------

Any good ideas how to acheive that?

RE: Question on converting array into sub-arrays

Michael Nye — Sat, 06 Aug 2016 01:00:04 GMT

I don't believe there's an existing function for this. You would have to use a combination of looping functions: forum.appian.com/.../Looping_Functions.html and array functions:
forum.appian.com/.../Array_Functions.html