readline.m v4.0

Reads the specified line(s) from a file.
4.7K Downloads
Updated 1 Jan 2016

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USAGE:
% Reads the first line (default)
s = readline('data.txt');
% Reads the 8th line
s = readline('data.txt',8);

% Reads the [1 2 4 8] lines
s = readline('data.txt',[1 2 4 8]);
% Reads last 7 lines
s = readline('data.txt',[-7; -1]);
% Or just, reads the whole file
s = readline('data.txt','all');

NOTES:
In general, the output is a cell of strings. You may force a string matrix output with a third argument
s = readline('data.txt','all','string');

Cite As

Carlos Adrian Vargas Aguilera (2024). readline.m v4.0 (https://www.mathworks.com/matlabcentral/fileexchange/20026-readline-m-v4-0), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2014b
Compatible with any release
Platform Compatibility
Windows macOS Linux
Categories
Find more on Low-Level File I/O in Help Center and MATLAB Answers
Acknowledgements

Inspired by: saveascii.m v6.2 (Oct 2009)

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Version Published Release Notes
4.0.0.0

V4.0 Now accepts 'all' input. Uses TEXTSCAN instead of TEXTREAD.

1.1.0.0

V3.0 Rewritten code. Negative NLINES values now indicated number of line from the End-of-File, instead of from the last line. New pairwise optional inputs for TEXTSCAN.

1.0.0.0

1. I change the loops of FGETL by a single TEXTREAD function as suggested by Urs (us) Schwarz.

2. New easy way for the lines inputs. Now accepts ascending and descending (negative) ranges.

3. I eliminate the file identifier input.