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how can i convert the following script into function??

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Sanjeev Ramachandran
Sanjeev Ramachandran on 12 Dec 2018
Edited: Walter Roberson on 12 Dec 2018
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);

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Answers (2)

madhan ravi
madhan ravi on 12 Dec 2018
Edited: madhan ravi on 12 Dec 2018
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

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madhan ravi
madhan ravi on 12 Dec 2018
did you save your function? with the correct name ? what did you save yoiur function as?
madhan ravi
madhan ravi on 12 Dec 2018
Paste the complete error message and the function you are trying with a sample file to test also how do you call the function?

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Walter Roberson
Walter Roberson on 12 Dec 2018
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

  2 Comments

Walter Roberson
Walter Roberson on 12 Dec 2018
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.)

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