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#Adding Fixed Unit Convesions Functions are added to Izenda through the extended functions API code. You can learn more about UDFs (User Defined Functions) [[here|http://wiki.izenda.com/FAQ/izenda-and-udfs]]. These functions are available in the 'Functions' drop-down. They can also be used in an expression by clicking the gear to the right side of the field. >_**The specific process to deploy functions depends how the data is stored in the DB, and what the use-case is.**_ **Example 1**: _Data stored in Meters - Output needed in Meters, Kilometers and Miles._ If the data for a distance column was stored in meters lets say, and you wanted to display either **meters**, **miles** or **kilometers**. You would add [[custom Formats|/FAQ/Questions/Add-Formatting-Options]] to display desired values to append _(m, km, mi)_, and custom functions to do the conversion to **Miles** and **Kilometers** from **meters**. **To use Example 1 in tool once API work is done:** 1. User selects column 'Distance'. 2. User selects the appropriate choices for their needs * To display meters; user chooses no function, and chooses 'm' in format. * To display in Miles; user chooses 'Miles' in function dropdown, and 'mi' in format. * To display in Kilometers; user chooses 'Km' in function dropdown, and 'km' in format. ----- **Example 2**: _Data stored in KpG (Kilometers/Gallon) - Output needed in both 'KpG' and 'MpG' (Miles/Gallon)._ 1. Add custom Function to convert KpG -> MpG to DB. 2. Add custom Function from DB to Izenda (API) 3. Add custom Formats for 'MpG' and 'KpG' * To display KpG: Choose mileage field, choose no function, choose 'KpG' format. * To display MpG: Choose mileage field, choose 'MpG' function, choose 'MpG' format.
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 **This documentation is for the legacy Izenda 6 product. Documentation for the new Izenda 7 product can be found at [[https://www.izenda.com/docs/|https://www.izenda.com/docs/]]**
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