# Why i'm getting NAN in debug of temp value
**URL:** https://discourse.nodered.org/t/why-im-getting-nan-in-debug-of-temp-value/39477
**Category:** General
**Created:** [21 January 2021 08:31 UTC](https://discourse.nodered.org/t/why-im-getting-nan-in-debug-of-temp-value/39477 "2021-01-21T08:31:27Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@arvind423](https://discourse.nodered.org/u/arvind423)
#### Post date: [21 January 2021 08:31 UTC](https://discourse.nodered.org/t/why-im-getting-nan-in-debug-of-temp-value/39477/1 "2021-01-21T08:31:27Z")
```auto
var temp1= msg.payload[6]-48;
var temp2= msg.payload[7]-48;
var temp3= msg.payload[9]-48;
var temp4= msg.payload[10]-48;
var result = (temp1*1000)+ (temp2*100) + (temp3*10) + temp4;
result = result/100;
var result1 = {payload:result};
return[result1];
```
---
### Author:  [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [21 January 2021 09:33 UTC](https://discourse.nodered.org/t/why-im-getting-nan-in-debug-of-temp-value/39477/2 "2021-01-21T09:33:19Z")
presumably one of those inputs is not of numeric type...
can you show us the incoming payload ? feed into a debug node and show us the result.
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [21 January 2021 10:10 UTC](https://discourse.nodered.org/t/why-im-getting-nan-in-debug-of-temp-value/39477/3 "2021-01-21T10:10:22Z")
Is the payload you are passing in a string, array or Buffer?
Feed it into a debug node and it will tell you
**[Edit]** If it is a string, which I suspect it is then try this
```auto
msg.payload = Number(msg.payload.substr(6,4))
return msg;
```
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [22 March 2021 10:10 UTC](https://discourse.nodered.org/t/why-im-getting-nan-in-debug-of-temp-value/39477/4 "2021-03-22T10:10:33Z")
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