how to solve the problem?

function raw2jpeg(lfp_file)
cd('lfptools')                                                            
sys_command =  ['./lfpsplitter ../' lfp_file]                             
system(sys_command,'-echo')                                               
cd('..')                                                                  

[lfp_folder, lfp_path , ~]   = fileparts(lfp_file)                           

lfp_path = [lfp_folder '/' lfp_path]                                      

fin = fopen(strcat(lfp_path, '_imageRef0.raw'), 'r')                      
meta = fopen(strcat(lfp_path, '_metadataRef0.txt'), 'r')

The below is the result.

The function or variable 'lfp_file' is not defined.

The reference of it says 'Input : file_path (file path to the .lfp file)'.