# getSourceIndex(sourceName) Status: current Introduced in 2.6 #### Parameters * `sourceName`: string naming a value source as it is shown on radio menus where you can select it. Notice that many names have[ special characters](https://luadoc.edgetx.org/edgetx-2.6/part_iii_-_opentx_lua_api_reference/constants/special-character-constants) in them. Return value * `sourceIndex`: integer. The source index, which can be used as input for `getSourceName(sourceIndex)`, `getValue(sourceIndex)`, and `getFieldInfo(sourceIndex)`. #### Notice The source names shown on the screen are not the same as the names used by `getFieldInfo` and `getValue`. But the indices are the same, so e.g. `getValue(index)` will work with the indices obtained here. This function is rather time consuming, and should not be used repeatedly in a script, if it can be avoided.