fileDatastore — Create a file datastore descriptor object.
fileDatastore(files, Name, Value) creates a descriptor object for file-backed datastore workflows.
Syntax
fileDatastore(files, Name, Value)How fileDatastore works
- The constructor preserves file specifications and common metadata options:
ReadFcn,FileExtensions,IncludeSubfolders, andReadMode. ReadFcnis retained as the supplied value, including function handles, so caller code can pass datastore descriptors around without invoking the reader during construction.- Iterator-style operations such as
read,hasdata, andresetrequire the generic datastore dispatch layer and are not provided by this constructor builtin.
Example
Create file datastore descriptor
ds = fileDatastore('*.txt', 'ReadFcn', @readlines)Expected output:
ds = fileDatastore objectUsing fileDatastore with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how fileDatastore changes the result.
Run a small fileDatastore example, explain the result, then change one input and compare the output.
Related Io functions
Tabular
arrayDatastore · csvread · csvwrite · detectImportOptions · dlmread · dlmwrite · parquetDatastore · parquetinfo · parquetread · readcell · readmatrix · readtable · readtimetable · spreadsheetImportOptions · writecell · writematrix · writetable · writetimetable · xlsread · xlswrite
Repl Fs
addpath · cd · copyfile · delete · dir · exist · fileattrib · fileparts · fullfile · genpath · getenv · getpref · isenv · isfile · isfolder · ispref · ls · matlabroot · memmapfile · mkdir · movefile · open · opentoline · path · pathsep · pcode · pwd · readstruct · rehash · restoredefaultpath · rmdir · rmpath · run · savepath · setenv · setpref · system · tempdir · tempname · uigetdir · uigetfile · uiputfile · unsetenv · userpath · what · winqueryreg · xmlread · xmlwrite
Filetext
fclose · feof · fgetl · fgets · fileread · filewrite · fopen · fprintf · fread · frewind · fwrite · readlines · writelines
Import
Json
Open-source implementation
Unlike proprietary runtimes, every RunMat function is open-source. Read exactly how fileDatastore is executed, line by line, in Rust.
- View the source for fileDatastore in Rust on GitHub
- Learn how the RunMat runtime works
- Found a bug? Open an issue with a minimal reproduction.
About RunMat
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