processing a file but keeping blank lines intact
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Christina Verhagen
el 27 de Sept. de 2023
Comentada: Voss
el 29 de Sept. de 2023
Hello,
I have a script that takes a file which contains 2 columns of data (in scientific notation), then subtracts a constant value from the first column, in order to commensate for a glitch in our machine which makes the measuremetns. A new file is then produced with the new values.
However, the original file contains blank lines throughout the sequence, and the new file does not.
How do I add a line into the script that tells it to keep blank lines?
Is this possible?
Thank you!
4 comentarios
Walter Roberson
el 29 de Sept. de 2023
Please post code rather than pictures of code. We cannot execute pictures of code.
Voss
el 29 de Sept. de 2023
@Christina Verhagen: I've modified my answer to work with your example file, please try to run it and see if it does what you want.
Respuesta aceptada
Voss
el 27 de Sept. de 2023
Editada: Voss
el 29 de Sept. de 2023
Here's one way:
input_file = 'file.txt';
output_file = 'file_modified.txt';
constant_offset = 100;
input_format = "%f,%f"; % modify this to match your file's format for reading
output_format = '%+.6E,%+.6E'; % modify this to try to match your file's format for writing
type(input_file); % show the original file's contents
L = readlines(input_file);
has_numbers = false(numel(L),1);
M = zeros(0,2);
for ii = 1:numel(L)
vals = textscan(L(ii),input_format);
vals = [vals{:}];
if numel(vals) == 2
has_numbers(ii) = true;
M(end+1,:) = vals;
end
end
M(:,1) = M(:,1)-constant_offset;
L(has_numbers) = compose(output_format,M);
writelines(L,output_file);
type(output_file); % show the modified file's contents
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Walter Roberson
el 27 de Sept. de 2023
Editada: Walter Roberson
el 27 de Sept. de 2023
ConstantOffset = as appropriate;
filename_in = 'as appropriate';
filename_out = 'as appropriate preferably not the same';
C = readcell(filename_in);
mask = cellfun(@(V) isnumeric(V) && ~isempty(V), C(:,1));
C(mask) = cellfun(@(V)V-constant_offset, C(mask,1), 'uniform', 0);
writecell(C, filename_out);
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