# Reducing a complexity of the flow

**URL:** <https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508>\
**Category:** General\
**Created:** [11 January 2023 03:57 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508 "2023-01-11T03:57:09Z")\
**Posts on this page:** 20\
**Page:** 1

<div class="post-metadata">

**Author:** ![Jhankhana](https://avatars.discourse-cdn.com/v4/letter/j/35a633/32.png) [@Jhankhana](https://discourse.nodered.org/u/Jhankhana)\
**Post date:** [11 January 2023 03:57 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/1 "2023-01-11T03:57:09Z")

</div>

Hello there,  
I wanted to do some mathematical calculations hence I created below flow which is working ok but it is bit complex.  
Please help me to make it simpler.

what I have done is,  
6 readings -- changes node to set topic(displayed using text node)--Summation of them-- % of each of the 6 readings with respect to total of 6--Displayed using text node  
(repeated for other 6 reading as below)  
6 readings -- changes node to set topic(displayed using text node)--Summation of them-- % of each of the 6 readings with respect to total of 6--Displayed using text node  
(then)  
Subtraction for each of the 6 readings.

```auto
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","tot":"jsonata"},{"t":"set","p":"topic","pt":"msg","to":"Agg1_Curr_Weight_Per","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":1230,"y":220,"wires":[["626bc123.a1266","30cb8cbe.814fc4"]]},{"id":"a4ba06e.98a10f8","type":"change","z":"ef1b3a9d.a6c5e8","name":"set topic to Filler_Curr","rules":[{"t":"set","p":"topic","pt":"msg","to":"Filler_Curr","tot":"str"},{"t":"set","p":"payload","pt":"msg","to":"payload[0]","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":780,"y":840,"wires":[["6d00d662.6cfcb8","e526ce94.718df","206e208c.aa83e","d06761b3.a7d19"]]},{"id":"6c1de8d3.cf0798","type":"change","z":"ef1b3a9d.a6c5e8","name":"set topic to 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\"series\":[\"Current Weight\"]}]\n}\nreturn 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(%)","tab":"975e5c7e.bc29e","order":7,"disp":true,"width":"6","collapse":false,"_type":"config"},{"id":"d934600f.4f9ef","type":"ui_group","z":"","name":"Targeted Recipie (%)","tab":"975e5c7e.bc29e","order":8,"disp":true,"width":"6","collapse":false,"_type":"config"},{"id":"975e5c7e.bc29e","type":"ui_tab","z":"","name":"Production Data","icon":"dashboard","publicAccess":"true","fmAccess":"none","fmAccessType":"private","assetType":"","asset":"","assetName":"","assetText":"","image":"","description":"","hideTitleBar":false,"_type":"config"}]

```

---

<div class="post-metadata">

**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [11 January 2023 05:06 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/2 "2023-01-11T05:06:39Z")

</div>

What is the source of the data, I see that it comes from an array, but it is always element 0. Is the data split up before this flow ?

---

<div class="post-metadata">

**Author:** ![Jhankhana](https://avatars.discourse-cdn.com/v4/letter/j/35a633/32.png) [@Jhankhana](https://discourse.nodered.org/u/Jhankhana)\
**Post date:** [11 January 2023 05:26 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/3 "2023-01-11T05:26:35Z")

</div>

Node from which I am giving input to the change node is gives value as below.

![Screenshot (152)](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/4/8/48724243f28f4258ebe6e488efcf2a7b5e971c0a.png)

---

<div class="post-metadata">

**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [11 January 2023 05:29 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/4 "2023-01-11T05:29:40Z")

</div>

Understood, is that coming from mqtt ? if yes, could you listen to `..../BatchMix/#` so that you have all values at once that can be joined ?

---

<div class="post-metadata">

**Author:** ![Jhankhana](https://avatars.discourse-cdn.com/v4/letter/j/35a633/32.png) [@Jhankhana](https://discourse.nodered.org/u/Jhankhana)\
**Post date:** [11 January 2023 05:36 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/5 "2023-01-11T05:36:04Z")

</div>

Actually, I am using Mindsphere which is based on node red. so, I am reading using timeseries node then extracting it to get individual variable and then goes according to this flow.  
I am attaching the image and the whole flow.

 ![Screenshot (154)](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/4/5/450e9910192a1569c78632fddda84c0905a9500f.png)  
[flows (15).json](https://discourse.nodered.org/uploads/short-url/5e2cOlB6nUpNdyUXqtxtv0zedrL.json) (37.0 KB)

---

<div class="post-metadata">

**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [11 January 2023 05:41 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/6 "2023-01-11T05:41:06Z")

</div>

Those "extract parameter" nodes are unknown nodes in node-red.

> then extracting it to get individual variable

This is where the complexity got introduced.

If you have an array of data, you can process the array as a whole and perform calculations directly without splitting everything up.

---

<div class="post-metadata">

**Author:** ![Jhankhana](https://avatars.discourse-cdn.com/v4/letter/j/35a633/32.png) [@Jhankhana](https://discourse.nodered.org/u/Jhankhana)\
**Post date:** [11 January 2023 06:13 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/7 "2023-01-11T06:13:45Z")

</div>

Thank you so much!  
Please help me bit more.  
I have done it with 2 variables to just check. Now I don't know how to get multiple outputs from function node.

This is what I have written in the function node...

```auto
let Agg1_Set = msg.payload[0].Agg1_Set_Weight;
let Agg1_Cur = msg.payload[0].Agg1_Current_Weight;
let Agg2_Set = msg.payload[0].Agg2_Set_Weight;
let Agg2_Cur = msg.payload[0].Agg2_Current_Weight;
let total_Cur=Agg1_Cur+Agg2_Cur;
let total_Set=Agg1_Cur+Agg2_Cur;

let Agg1_Cur_per= (100*Agg1_Cur)/total_Cur;
let Agg2_Cur_per= (100*Agg2_Cur)/total_Cur;

let Agg1_Set_per= (100*Agg1_Set)/total_Cur;
let Agg2_Set_per= (100*Agg2_Set)/total_Cur;

let Error_Agg1=Agg1_Set_per-Agg1_Cur_per;
let Error_Agg2= Agg2_Set_per-Agg2_Cur_per;

msg.payload = total_Cur; 
return msg;

```

Below is what I want to display(need as outputs from function node) ...  
6 variables (Agg1\_Set, Agg2\_Set..)  
6 variables(Agg1\_Cur, Agg2\_Cur...)  
6 variables(Agg1\_Cur\_per, Agg2\_Cur\_per...)  
6 variables(Agg1\_Set\_per, Agg2\_Set\_per...)  
6 variables(Error\_Agg1,Error\_Agg2...)

---

<div class="post-metadata">

**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [11 January 2023 06:18 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/8 "2023-01-11T06:18:48Z")

</div>

I think it will help if you can show the output that is coming out of the `Agg1 to Bitumen` node as you seem to extract data after that.

---

<div class="post-metadata">

**Author:** ![Jhankhana](https://avatars.discourse-cdn.com/v4/letter/j/35a633/32.png) [@Jhankhana](https://discourse.nodered.org/u/Jhankhana)\
**Post date:** [11 January 2023 06:24 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/9 "2023-01-11T06:24:36Z")

</div>

Sorry, forgot to attach

 ![Screenshot (157)](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/d/8/d8dfeef1ed44285fa673041111335d88e7ce9d88.png)

---

<div class="post-metadata">

**Author:** ![jbudd](https://avatars.discourse-cdn.com/v4/letter/j/5f8ce5/32.png) [@jbudd](https://discourse.nodered.org/u/jbudd)\
**Post date:** [11 January 2023 06:31 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/10 "2023-01-11T06:31:33Z")

</div>

It's much easier to understand the issue and provide support if you post actual data instead of a picture of the data!

---

<div class="post-metadata">

**Author:** ![Jhankhana](https://avatars.discourse-cdn.com/v4/letter/j/35a633/32.png) [@Jhankhana](https://discourse.nodered.org/u/Jhankhana)\
**Post date:** [11 January 2023 06:32 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/11 "2023-01-11T06:32:55Z")

</div>

[{"Agg1\_Set\_Weight":200,"Agg1\_Current\_Weight":177.48,"Agg2\_Current\_Weight":201.59999,"Agg2\_Set\_Weight":210,"\_time":"2023-01-11T05:45:05.075Z"}]

---

<div class="post-metadata">

**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [11 January 2023 08:13 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/12 "2023-01-11T08:13:01Z")

</div>

You could use a function node like this:

```auto

// const input = msg.payload

const input = [
    {
        "Agg1_Set_Weight": 200,
        "Agg1_Current_Weight": 177.48,
        "Agg2_Current_Weight": 201.59999,
        "Agg2_Set_Weight": 210
    }
]
const numberOfElements = 2 // = Agg1,Agg2 etc

function percentage(index,type,total){
    const el = input[0][`Agg${index}_${type}_Weight`]
    return (100 * el) / total
}

function getTotal(type){
    let total = 0
    for(let index = 1; index<numberOfElements+1;index++){
        total += input[0][`Agg${index}_${type}_Weight`]
    }
    return total
}

const total_Current = getTotal('Current')
const total_Set = getTotal('Set')

input[0].total_Current = total_Current
input[0].total_Set = total_Set

for (let index = 1; index < numberOfElements + 1; index++) {
    input[0][`Agg${index}_Current_percentage`] = percentage(index, 'Current', total_Current)
    input[0][`Agg${index}_Set_percentage`] = percentage(index, 'Set', total_Set)
    input[0][`Agg${index}_Error`] = input[0][`Agg${index}_Set_percentage`] - input[0][`Agg${index}_Current_percentage`]
}

msg.payload = input
return msg

```

_(pretty sure this can be more cleanly be refactored)_

It produces this as output:

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/9/0/909ab239eb72f012c4ea42680375b0c18e244d06.png)

But I would also recommend to produce an array as output instead, which in turn could be fed into a ui\_table node, so your flow could be reduced to 4 nodes (excluding the chart)

---

<div class="post-metadata">

**Author:** ![Jhankhana](https://avatars.discourse-cdn.com/v4/letter/j/35a633/32.png) [@Jhankhana](https://discourse.nodered.org/u/Jhankhana)\
**Post date:** [11 January 2023 10:25 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/13 "2023-01-11T10:25:46Z")

</div>

Please help me bit more.  
I am unable to understand the above function. where I should I write what?

&  
Is below, correct?  
edit:

```auto
const input = [
    {
        "Agg1_Cur" : msg.payload[0].Agg1_Current_Weight,
        "Agg2_Cur" : msg.payload[0].Agg2_Current_Weight,
        "Agg3_Cur" : msg.payload[0].Agg1_Current_Weight,
        "Agg4_Cur" : msg.payload[0].Agg2_Current_Weight,
        "Bitumen_Cur" : msg.payload[0].Bitumen_Current_Weight,
        "Filler_Cur" : msg.payload[0].Filler_Current_Weight
    }
]

```

---

<div class="post-metadata">

**Author:** ![Jhankhana](https://avatars.discourse-cdn.com/v4/letter/j/35a633/32.png) [@Jhankhana](https://discourse.nodered.org/u/Jhankhana)\
**Post date:** [11 January 2023 10:46 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/14 "2023-01-11T10:46:46Z")

</div>

Below is what I have written in the Function Node

```auto
// const input = msg.payload

const input = [
    {
      /* "Agg1_Set_Weight": 200,
        "Agg1_Current_Weight": 177.48,
        "Agg2_Current_Weight": 201.59999,
        "Agg2_Set_Weight": 210*/
        
        "Agg1_Cur" : msg.payload[0].Agg1_Current_Weight,
        "Agg2_Cur" : msg.payload[0].Agg2_Current_Weight,
        "Agg3_Cur" : msg.payload[0].Agg1_Current_Weight,
        "Agg4_Cur" : msg.payload[0].Agg2_Current_Weight,
        "Bitumen_Cur" : msg.payload[0].Bitumen_Current_Weight,
        "Filler_Cur" : msg.payload[0].Filler_Current_Weight,
        
        "Agg1_Set" : msg.payload[0].Agg1_Set_Weight,
        "Agg2_Set" : msg.payload[0].Agg2_Set_Weight,
        "Agg3_Set" : msg.payload[0].Agg1_Set_Weight,
        "Agg4_Set" : msg.payload[0].Agg2_Set_Weight,
        "Bitumen_Set" : msg.payload[0].Bitumen_Set_Weight,
        "Filler_Set" : msg.payload[0].Filler_Set_Weight
        
    }
];
const numberOfElements = 4; // = Agg1,Agg2 etc

function percentage(index,type,total){
    const el = input[0][`Agg${index}_${type}_Weight`];
    return (100 * el) / total;
}

function getTotal(type){
    let total = 0;
    for(let index = 1; index<numberOfElements+1;index++){
        total += input[0][`Agg${index}_${type}_Weight`];
    }
    return total;
}

const total_Current = getTotal('Current');
const total_Set = getTotal('Set');

input[0].total_Current = total_Current;
input[0].total_Set = total_Set;

for (let index = 1; index < numberOfElements + 1; index++) {
    input[0][`Agg${index}_Current_percentage`] = percentage(index, 'Current', total_Current);
    input[0][`Agg${index}_Set_percentage`] = percentage(index, 'Set', total_Set);
    input[0][`Agg${index}_Error`] = input[0][`Agg${index}_Set_percentage`] - input[0][`Agg${index}_Current_percentage`];
}

msg.payload = input;
return msg;

```

Getting in debug pen  
[{"Agg1\_Cur":210.6,"Agg2\_Cur":210.6,"Agg3\_Cur":210.6,"Agg4\_Cur":210.6,"Bitumen\_Cur":80.46,"Filler\_Cur":0,"Agg1\_Set":200,"Agg2\_Set":210,"Agg3\_Set":200,"Agg4\_Set":210,"Bitumen\_Set":50,"Filler\_Set":50,"total\_Current":null,"total\_Set":null,"Agg1\_Current\_percentage":null,"Agg1\_Set\_percentage":null,"Agg1\_Error":null,"Agg2\_Current\_percentage":null,"Agg2\_Set\_percentage":null,"Agg2\_Error":null,"Agg3\_Current\_percentage":null,"Agg3\_Set\_percentage":null,"Agg3\_Error":null,"Agg4\_Current\_percentage":null,"Agg4\_Set\_percentage":null,"Agg4\_Error":null}]

I guess  
const el = input[0][`Agg${index}_${type}_Weight`];  
total += input[0][`Agg${index}_${type}_Weight`];  
input[0][`Agg${index}_Error`] = input[0][`Agg${index}_Set_percentage`] - input[0]  
is what I have to change.  
But don't know what to write instead  
Please help me with this!

---

<div class="post-metadata">

**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [11 January 2023 11:18 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/15 "2023-01-11T11:18:34Z")

</div>

You can just set:

```auto
const input = msg.payload
const numberOfElements = 4; // = Agg1,Agg2 etc

```

---

<div class="post-metadata">

**Author:** ![Jhankhana](https://avatars.discourse-cdn.com/v4/letter/j/35a633/32.png) [@Jhankhana](https://discourse.nodered.org/u/Jhankhana)\
**Post date:** [11 January 2023 11:58 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/16 "2023-01-11T11:58:56Z")

</div>

Edit:  
I am unable to get Bitumen\_Current\_percentage,Bitumen\_Set\_percentage, Bitumen\_Error, Filler\_Current\_percentage,Filler\_Set\_percentage, Filler\_Error

What I am getting in debug ...  
[{"Agg1\_Current\_Weight":210.6,"Agg1\_Set\_Weight":200,"Agg2\_Current\_Weight":210.6,"Agg2\_Set\_Weight":210,"Agg3\_Current\_Weight":246.59998,"Agg3\_Set\_Weight":220,"Agg4\_Current\_Weight":241.20001,"Agg4\_Set\_Weight":270,"Bitumen\_Current\_Weight":80.46,"Bitumen\_Set\_Weight":50,"Filler\_Current\_Weight":0,"Filler\_Set\_Weight":50,"\_time":"2023-01-11T11:57:31.776Z","total\_Current":908.99999,"total\_Set":900,"Agg1\_Current\_percentage":23.168317086560144,"Agg1\_Set\_percentage":22.22222222222222,"Agg1\_Error":-0.9460948643379226,"Agg2\_Current\_percentage":23.168317086560144,"Agg2\_Set\_percentage":23.333333333333332,"Agg2\_Error":0.16501624677318816,"Agg3\_Current\_percentage":27.12871096951277,"Agg3\_Set\_percentage":24.444444444444443,"Agg3\_Error":-2.6842665250683275,"Agg4\_Current\_percentage":26.534654857366938,"Agg4\_Set\_percentage":30,"Agg4\_Error":3.465345142633062}]

Also  
what and Where I should write to round up to 2 decimal point.(00.00)?

---

<div class="post-metadata">

**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [11 January 2023 12:10 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/17 "2023-01-11T12:10:55Z")

</div>

> I am unable to get Bitumen\_Current\_percentage,Bitumen\_Set\_percentage, Bitumen\_Error,

Because you did not ask for that ?

> what and Where I should write to round up to 2 decimal point.(00.00)?

It is best to do this in the dashboard nodes directly and keep the values for what they are - in case you ever want to use them further in a flow, unless you don't mind rounding errors.

in dashboard text node you can use:

```auto
{{ msg.payload[0].Agg1_Current_Weight | number:2 }}

```

which will produce 2 decimals.

---

<div class="post-metadata">

**Author:** ![Jhankhana](https://avatars.discourse-cdn.com/v4/letter/j/35a633/32.png) [@Jhankhana](https://discourse.nodered.org/u/Jhankhana)\
**Post date:** [11 January 2023 12:21 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/18 "2023-01-11T12:21:00Z")

</div>

> [@bakman2](#):
>
> Because you did not ask for that ?

I thought, by keeping ref what you have written I will be able to do so. But now, I am unable to do. that's why asking it.

> [@bakman2](#):
>
> in dashboard text node you can use:

Actually, I am Trying to use table node directly.  
For that I have written as below,

```auto
  msg.payload = [
    {
        "Name": "Agg1",  
        "Last Bactch": msg.payload[0].Agg1_Current_Weight,
        "Achived Recipie(%)": msg.payload[0].Agg1_Current_percentage,
        "Targated Recipie(%)": msg.payload[0].Agg1_Set_percentage,
        "Error in Recipie(%)": msg.payload[0].Agg1_Error
    },
    {
        "Name": "Agg2",
        "Last Bactch": msg.payload[0].Agg2_Current_Weight,
        "Achived Recipie (%)": msg.payload[0].Agg2_Current_percentage,
        "Targated Recipie (%)": msg.payload[0].Agg2_Set_percentage,
        "Error in Recipie (%)": msg.payload[0].Agg2_Error
    },
    {
        "Name": "Agg3",  
        "Last Bactch": msg.payload[0].Agg3_Current_Weight,
        "Achived Recipie(%)": msg.payload[0].Agg3_Current_percentage,
        "Targated Recipie(%)": msg.payload[0].Agg3_Set_percentage,
        "Error in Recipie(%)": msg.payload[0].Agg3_Error
    },
    {
        "Name": "Agg4",  
        "Last Bactch": msg.payload[0].Agg4_Current_Weight,
        "Achived Recipie(%)": msg.payload[0].Agg4_Current_percentage,
        "Targated Recipie(%)": msg.payload[0].Agg4_Set_percentage,
        "Error in Recipie(%)": msg.payload[0].Agg4_Error
    }
  ];
  return msg;

```

---

<div class="post-metadata">

**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [11 January 2023 12:25 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/19 "2023-01-11T12:25:35Z")

</div>

If you want to produce an array instead, then the function node can be rewritten to make this much easier. That is why it is important to ask the right questions and provide the "raw" input and the expected output.

There is no need to write everything manually (hard to maintain), but we can only help if we know the input/output.

---

<div class="post-metadata">

**Author:** ![Jhankhana](https://avatars.discourse-cdn.com/v4/letter/j/35a633/32.png) [@Jhankhana](https://discourse.nodered.org/u/Jhankhana)\
**Post date:** [11 January 2023 12:32 UTC](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508/20 "2023-01-11T12:32:10Z")

</div>

Sorry for the inconvenience Sir.  
Initially I ware planning to display in text node only. but I realis your suggestion to display in table will be better.  
Please help me with this. Next time I will take care of it.

Edit:  
Now, you now about input already and in output I am trying to get as below  
Material (Agg2...Filler), Current Weight, Set Weight, Current Percentage, Set Percentage, Error Percentage as row Heading and then values in Column under the particular row.

[Next page](https://discourse.nodered.org/t/reducing-a-complexity-of-the-flow/73508.md?page=2)