Reading and writing files

Reading a .seq file into a sequence whose system is built from the file, writing a sequence in the text or the binary form, and the tables a file of a sequence holds, as arrays. Storage, deduplication and file revisions describes what a file records, including which system limits, and the two forms.

File input and output

Object	Input	Returns	Purpose
read	File path; optional gradient and slew limits	Sequence on a system built from the file	Read with file-derived rasters and limits.
read_chain	First file path; detect_rf_use, verify	(Path, Sequence) pairs in play order	Read a file and the NextSequence files it names, each on a system built from it.
write	Sequence, file path, binary	Text signature, or None for binary	Write Pulseq text or binary.

Library export

libraries() returns the block table and every library of a sequence as the tables a text file of it holds: the rows write() writes with remove_duplicates=False, under the same ids, in read-only arrays. Times are in seconds and the other columns are in the file’s units.

Object	Input	Returns	Purpose
SequenceLibraries	—	Block table; RF, gradient, ADC, shape and extension tables; layout	A sequence’s libraries without decoding its blocks.
Shape	Sample count, stored values	Shape; decompressed returns the samples	One row of the shape library.