can anybody help me with this error,load a file in workspace and ruleviewer

hi ,

can any body pls sort out this error ,i am simulating a power system model for my project but facing this error,pls if you can tell me what is the root cause of it and how i can solve it ,

thanks alot

Error evaluating parameter 'fismatrix' in 'Microgrid/Battery Management System1/ANFIS Controller with Ruleviewer'

Caused by:

• Undefined function or variable 'BMSS1'.
• Variable 'BMSS1' does not exist.

Suggested Actions

Load a file into base workspace.

Fix

Create a new variable.

Fix

Component:Simulink | Category:Model error

Error evaluating parameter 'fismatrix' in 'Microgrid/FC/ANFIS Controller with Ruleviewer'

Caused by:

• Undefined function or variable 'fc'.
• Variable 'fc' does not exist.

Suggested Actions

Load a file into base workspace.

Fix

Create a new variable.

Fix

Component:Simulink | Category:Model error

Error evaluating parameter 'fismatrix' in 'Microgrid/Fuzzy Logic Controller with Ruleviewer'

Answer 1

[Riya]

Hi Kapil,

I understand that you are encountering an error related to missing variables like “BMSS1” and “fc” in your Simulink model.

This usually happens when “FIS” (Fuzzy Inference System) variables expected by “ANFIS” or “Fuzzy blocks” are not loaded into the base workspace before simulation.

To solve this issue, you can load the required variables manually by running the following code:

BMSS1 = readfis('BMSS1.fis'); 
fc = readfis('fc.fis'); 

Or, if using a “.mat” file:

load('your_file.mat'); % Must contain BMSS1, fc 

You can also automate the loading process by going to “File → Model Properties → Callbacks → PreLoadFcn” and then adding:

BMSS1 = readfis('BMSS1.fis'); 
fc = readfis('fc.fis'); 

Lastly, you must ensure that the “FIS matrix” fields in Simulink blocks exactly match the variable names. Now your simulation and “Ruleviewer” should work without any errors.