# Divide 2 values in a function

**URL:** <https://discourse.nodered.org/t/divide-2-values-in-a-function/33443>\
**Category:** General\
**Created:** [28 September 2020 11:55 UTC](https://discourse.nodered.org/t/divide-2-values-in-a-function/33443 "2020-09-28T11:55:33Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jurg1505](https://avatars.discourse-cdn.com/v4/letter/j/3ab097/32.png) [@Jurg1505](https://discourse.nodered.org/u/Jurg1505)\
**Post date:** [28 September 2020 11:55 UTC](https://discourse.nodered.org/t/divide-2-values-in-a-function/33443/1 "2020-09-28T11:55:33Z")

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How can i divide 2 values in a function ?

```auto
var Fan = context.get('Fan') || 0; // Value 0 - 100 step 5
var Pomp = context.get('Pomp') || 0; // Value 1 - 10 step 0.1

if (msg.topic == 'Fan')
{
    Fan = {payload: msg.payload};
    context.set('Fan', Fan);
}

if (msg.topic == 'Pomp')
{
    Pomp = {payload: msg.payload};
    context.set('Pomp', Pomp);
}
msg.payload = Fan / Pomp;
return msg

```

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<div class="post-metadata">

**Author:** ![janvda](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/janvda/32/234_2.png) [@janvda](https://discourse.nodered.org/u/janvda)\
**Post date:** [28 September 2020 12:28 UTC](https://discourse.nodered.org/t/divide-2-values-in-a-function/33443/2 "2020-09-28T12:28:00Z")

</div>

1/ If Pomp = 0 then you get a division by 0.  
2/ You are not populating the context variables with numbers but with a { payload : }.

A possible correction:

```auto
var Fan = context.get('Fan') || 0; // Value 0 - 100 step 5
var Pomp = context.get('Pomp') || 0.1; // Value 1 - 10 step 0.1

if (msg.topic == 'Fan')
{
    Fan = msg.payload;
    context.set('Fan', Fan);
}

if (msg.topic == 'Pomp')
{
    Pomp = msg.payload;
    context.set('Pomp', Pomp);
}
msg.payload = Fan / Pomp;
return msg

```

---

<div class="post-metadata">

**Author:** ![Jurg1505](https://avatars.discourse-cdn.com/v4/letter/j/3ab097/32.png) [@Jurg1505](https://discourse.nodered.org/u/Jurg1505)\
**Post date:** [28 September 2020 18:29 UTC](https://discourse.nodered.org/t/divide-2-values-in-a-function/33443/3 "2020-09-28T18:29:53Z")

</div>

Thanks, that is the solution.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [12 October 2020 18:29 UTC](https://discourse.nodered.org/t/divide-2-values-in-a-function/33443/4 "2020-10-12T18:29:54Z")

</div>

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