f — File I/O

Documentation

Reference

Commands

f — File I/O

Command	Action
`fl <pattern>`	Load files from disk (glob pattern)
`fs`	Save to disk (`.yda` format)
`fso`	Save to disk, allow overwrite
`fe1`	Export: z and y only, one line per spectrum
`fe2`	Export: one block per spectrum (z header + x-y lines)
`fc`	Copy file in memory
`fx`	Exchange — copy, then delete source
`fdel`	Delete file from memory
`fm`	Make — create a small test file
`fr`	Read in (interactive)
`fth`	Read tab, horizontal (y values, one line per spectrum)
`ftv`	Read tab, vertical (one x-y pair per line)
`ftc`	Read tab, choose columns

Loading files

fl accepts shell glob patterns:

0 > fl xx_20K.y08        # load one file
0 > fl run_*.nxs         # load a series

After loading, df shows the file dimensions, coordinates, and workspace number assigned. The workspace number appears at the prompt (0 >, 1 >, …).

Tab-delimited input

Choose the ft variant based on your file layout:

Variant	Layout
`fth`	One spectrum per row; columns are y values. No x column — x is assigned later with `ox`.
`ftv`	Two columns: x and y, one data point per row. All rows form a single spectrum.
`ftc`	Interactive: choose which columns map to x, y, dy.

Modifiers can be combined with any ft command:

Modifier	Effect
`m`	Multi-block: each blank-line-separated block becomes one spectrum
`s`	Read path from script (non-interactive)
`d`	File includes a dy (error) column

Example — load a two-column (x, y) file with errors, multi-block:

0 > ftvmd mydata.dat

Export formats

fe1 and fe2 write plain text suitable for external tools:

fe1 — one line per spectrum: z0 y0 y1 y2 …
fe2 — one block per spectrum, with a header line # z0 = <value> followed by x-y pairs

For full round-trip fidelity (all metadata, error bars, history), use fs / fso to save in .yda format and fl to reload.