Read/Write table to files

📄Description

Nelson reads and writes tables in text-based and binary file formats for common data exchange tasks.

Text files (.csv, .txt, etc.):

writetable() exports tables to delimited text files with customizable separators
readtable() imports tables from delimited text files with automatic format detection
Text files preserve variable names and data in human-readable format

Binary file:

Nelson HDF5 format (.nh5):
- Efficient binary storage using HDF5 format
- Preserves all table metadata and data types
- Use save -nh5 and load commands

Binary format is recommended for preserving exact numeric precision and working with large datasets.

Saved tables preserve the public T.Properties metadata. The internal table representation is not part of the file format contract.

💡Examples

Read/Write table to .nh5 file

% Create a sample table with sensor data
T = table([1.5; -2.3; 4.7], [0.5; 1.1; -0.7], [-1; 2; 3], 'VariableNames', {'Voltage', 'Current', 'Resistance'});
R = T;
filename = [tempdir(), 'table_example.nh5'];
save(filename, '-nh5', 'T');
clear T
load(filename, 'T');
assert(isequal(T, R));
T

Read/Write table to text file

% Create a sample table with sensor data
T = table([1.5; -2.3; 4.7], [0.5; 1.1; -0.7], [-1; 2; 3], 'VariableNames', {'Voltage', 'Current', 'Resistance'});
filename = [tempdir(), 'table_example.csv'];
writetable(T, filename);
T2 = readtable(filename);

🔗See Also

writetable readtable load save

🕔Version History

Version	Description
1.10.0	initial version

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