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Help with Yanfly Extra Param Formulas

BMM_Archive · July 15, 2026

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Preserved forum archive. This topic stores the original first post and locally mirrored RPG Maker Web attachments when available. It is posted by the BMMPlay archive account, not by the original creator.

Original Source

  • Original title: Help with Yanfly Extra Param Formulas
  • Original author: jonthefox
  • Original date: February 1, 2015
  • Source thread: https://forums.rpgmakerweb.com/threads/help-with-yanfly-extra-param-formulas.36495/
  • Source forum path: Game Development Engines > Ruby Game System (RGSS) Scripts > RGSSx Script Support

Summary

Hi everyone, I love this script but I'm running into a strange problem. link to script:  https://yanflychannel.wordpress.com/rmvxa/core-scripts/extra-param-formulas/ I am trying to change the eva formula, but the script returns an error depending on the parameter I call.  What I mean is, I am getting an error when I use this: :eva_n_value => "def * 0.200",

Archived First Post

Hi everyone, I love this script but I'm running into a strange problem.

link to script:  https://yanflychannel.wordpress.com/rmvxa/core-scripts/extra-param-formulas/

I am trying to change the eva formula, but the script returns an error depending on the parameter I call.  What I mean is, I am getting an error when I use this:

:eva_n_value => "def * 0.200",

:eva_formula => "(n * 0.010) + base_eva",

but I DON'T receive the error when I use the same exact code but substitute "agi" in place of "def".

I AM using some custom parameter names, but I have kept DEF the same.  The attached screenshot shows the error I get when I try to change the formula from agi to def.

What's also strange is that I DON'T receive the error for other formulas I've called the Def parameter for, such as hit rate and crit chance. 

I eventually would like to make the formula more complex than the above, but currently can't figure out how to get past this problem.  Thanks so much in advance for any help.

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