how can i convert the following script into function??

I am having trouble in converting the following Script into function

fid = fopen('C:\Users\Windows\Downloads\INPUT_1.txt', 'r+');
data1 = zeros(4007,1);
data1 = fscanf(fid, '%f');
fclose(fid);

plot(data1);
b = [0.0305, 0.0305];
a = [1, -0.9391];
zi = 0.9695;
y = filter(b, a, data1, data1(1)*zi);

fid = fopen('C:\Users\Windows\Downloads\RESULT.txt', 'w+');
[m1, n1] = size(data1)
for i = 1:m1
    fprintf(fid, '%f\r\n',data1(i,1));
end
fclose(fid);

Answer 1

[madhan ravi]

save it as main1.m file it becomes a function now you can also Parameterize your function if you want to...

function main1
your script
end

[Sanjeev Ramachandran]

I tried it but I am getting build failed

[madhan ravi]

did you save your function? with the correct name ? what did you save yoiur function as?

[Sanjeev Ramachandran]

Yes I saved it as main1.m

[madhan ravi]

Paste the complete error message and the function you are trying with a sample file to test also how do you call the function?

Answer 2

[Walter Roberson]

function main1(filename_in, filename_out)

    if nargin < 2
        error('Not enough input arguments')
    end

    [fid, msg] = fopen(filename_in, 'r+');
    if fid < 0
      error('Failed to open input file "%s" because "%s"', filename_in, msg);
    end
    data1 = zeros(4007,1);
    data1 = fscanf(fid, '%f');
    fclose(fid);
    plot(data1);
    b = [0.0305, 0.0305];
    a = [1, -0.9391];
    zi = 0.9695;
    y = filter(b, a, data1, data1(1)*zi);
    [fid, msg] = fopen(filename_out, 'w+');
    if fid < 0
      error('Failed to open output file "%s" because "%s"', filename_out, msg)
    end
    [m1, n1] = size(data1)
    for i = 1:m1
    fprintf(fid, '%f\r\n',data1(i,1));
    end
    fclose(fid);
end

[Sanjeev Ramachandran]

I tried it but I am getting as build failed

[Walter Roberson]

Please show in more detail what you did ?

Your use of the word "build" suggests to me you might be using MATLAB Compiler, and that your reason for converting to a function might be to be able to create an executable from the code.

If that is your purpose, and you always want to use the same file names, then follow madhan's procedure of just putting a "function" statement at the top of the code with the function name matching the name of the file (which would have to be a MATLAB identifier.)