How to divide events in a field by events in another field?

[Ragate]

I want to divide events in one field by events in another field that would then display in a dashboard as a single value. I have two fields that are currently display in my dashboard. One is a list of different Revenue Numbers and the other is a list of Documents Processed. It Looks like this:

"Total Active Subscription Revenue _converted"   ----------------         " DocCount"
234542  -------------------------------------------------------------------------------           5  
341324  -------------------------------------------------------------------------------           3
34253   ---------------------------------------------------------------------------------        2
2314      -----------------------------------------------------------------------------------1

The query I have so far is this:

source="c:\\users\\ragate\\desktop\\splunk\\jsondump.txt" | eval "License Key Identifier"=substr('context.custom.dimensions{}.LicenseKey' ,4,7)  | join type=left "License Key Identifier" [search source="LMCustomerRevLicense1.csv"] | stats distinct_count("context.custom.dimensions{}.DocumentSessionId") by "Account Name" "Total Active Subscription Revenue _converted" | rename distinct_count("context.custom.dimensions{}.DocumentSessionId") AS DocCount |

I tried using |eval DocCost= "Total Active Subscription Revenue _converted"/DocCount | but this just brings me back and error saying "type checking failed. '/' only takes numbers"
Any Suggestions?

[somesoni2 · Accepted solution]

Try this

source="c:\\users\\ragate\\desktop\\splunk\\jsondump.txt" | eval "License Key Identifier"=substr('context.custom.dimensions{}.LicenseKey' ,4,7) | join type=left "License Key Identifier" [search source="LMCustomerRevLicense1.csv"] | stats distinct_count("context.custom.dimensions{}.DocumentSessionId") as DocCount by "Account Name" "Total Active Subscription Revenue _converted" 
| eval DocCost='Total Active Subscription Revenue _converted'/DocCount

Fields with special characters/spaces in their name should be used within single quotes in eval-expression (and where expression). With double quotes they're treated as literal string and give that typecast error.

[Ragate]

Thank you!