Functions in If Statements

I have two versions of code separated by an if statement. The if statement checks the version of Matlab that the user is running and executes based on that. So the two versions of code are incompatible with the other version, so I have to put each block of code in a function. Here's my problem: I have no idea how to properly execute the function in the main program. Here is some example code

Main Block of code

v= ver('MATLAB'); 

if v.Release =='(R2012a)'
    for n= 1:FMn %cycle through files in the directory
   finalname = FMdir(n).name;
end 

start = 1; %start at one
out = n; %stop at the last file in the folder

for k = start:out
     FM =  FMdir(k).name;
 InM = InMdir(k).name;

ProcessFilesOld(FM, InM, k) %FUNCTION
%more code

end
elseif v.Release=='(R2019b)'
    
    for n= 1:FMn %cycle through files in the directory
   finalname = FMdir(n).name;
    end 

start = 1; %start at one
out = n; %stop at the last file in the folder

for i = start:out
     num_strfinal = num2str(i, '%02.f'); %cast the number as a string (make the format be 0#)
    number = string(num_strfinal); 
    FM = dir(fullfile(filepath,'Processfiles\*FM')+ number + '_*.ep'); %Pull out the final measurement file being used
    FinalM = getfield(FM, 'name'); %pull out and save the name field
    IN = dir(fullfile(filepath,'Processfiles\*InM')+ number + '_*.ep'); %Pull out the initial measurment file being used
    InitialM = getfield(IN, 'name'); %pull out and save the name field
    
   ProcessFilesNew(FinalM, InitialM) %FUNCTION
   %
   % More code
end 
end

Example of ProcessFilesNew code

function [Final,Initial,Difference,serial ] = ProcessFilesNew(FinalM, InitialM )


    
    opts = detectImportOptions(FinalM, 'FileType','text'); %Set the file type as a text 
    
    opts.DataLines = [1, Inf]; %Start at one and go through the entire document, regardless of length
    opts.Delimiter = ','; %look for 2 column data
    
    opts.VariableNames = ['Frequency', 'Magnitude']; %Label x-axis and y-axis 
    opts.VariableTypes = ["double", "double"]; %Import data as doubles
    
    opts.ImportErrorRule = "omitrow"; %If data isn't double then ignore row
    opts.MissingRule = "omitrow"; %If data is missing, ignore row
    
    opts.ExtraColumnsRule = "ignore"; %Ignore extra columns
    opts.EmptyLineRule = "read"; 
    
    Final = readtable(FinalM, opts); 
    
    %% REPEAT THIS CODE BUT FOR InitialM

If you need more code let me know, I figured you wouldn't appreciate sifting through 140 lines if you didn't need it.

Please help me figure out how to make the functions work, thank you

[Walter Roberson]

    FM = dir(fullfile(filepath,'Processfiles\*FM')+ number + '_*.ep'); %Pull out the final measurement file being used
    FinalM = getfield(FM, 'name'); %pull out and save the name field

The code is going to have problems if there is more than one _*.ep file

[dpb]

" I have no idea how to properly execute the function in the main program. "

What does this mean? Just have the toplevel be either a script or a function that may need no inputs and kick it off...what else is needed; the version conditional logic is inside it.

Answer 1

[Jan]

This:

for n = 1:FMn %cycle through files in the directory
   finalname = FMdir(n).name;
end 

does the same as:

finalname = FMdir(FMn).name;

The shown function ProcessFilesNew cannot run in R2012b, because Matlab handles the string type since R2016b.

Note that:

['Frequency', 'Magnitude']

is the same as:

'FrequencyMagnitude'

a concatenated CHAR vector.

["double", "double"]

is something completely different: a vector of 2 strings.