dbtype — Display MATLAB source text with line numbers.
dbtype resolves a MATLAB source file through the active filesystem/search-path layer and writes numbered source lines to the command stream.
Syntax
dbtype file
dbtype file start:endInputs
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
file | StringScalar | Yes | — | MATLAB source file, path, or function name. |
range | StringScalar | No | — | Optional line range such as `3:8`. |
Errors
| Identifier | When | Message |
|---|---|---|
RunMat:TooManyInputs | A debugger compatibility helper receives more inputs than it supports. | debugger helper: too many input arguments |
RunMat:InvalidInput | An input is not a supported text, scalar, or option value. | debugger helper: invalid input |
RunMat:NoCurrentFile | `mlock`, `munlock`, or `mislocked` is called without a current function or script. | debugger helper: no current function or script is available |
RunMat:FileNotFound | `dbtype` cannot resolve a MATLAB source file. | dbtype: file not found |
RunMat:FileReadFailed | `dbtype` cannot read the resolved source file. | dbtype: failed to read file |
How dbtype works
dbtype filedisplays the entire source file with line numbers.dbtype file start:enddisplays an inclusive line range.- The file argument may be a path, an
.mfile, or a bare function/script name resolvable on the RunMat path. - Builtins cannot be displayed because there is no MATLAB source file to show.
Does RunMat run dbtype on the GPU?
dbtype is a host-side source display command and is excluded from GPU execution and fusion.
Examples
Display a file
dbtype myscript.mDisplay selected lines
dbtype myscript.m 3:8Using dbtype with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how dbtype changes the result.
Run a small dbtype example, explain the result, then change one input and compare the output.
FAQ
Can dbtype display Rust builtin source?⌄
No. It displays MATLAB source files found by the RunMat filesystem/search path.
Related Introspection functions
addprop · class · clear · clearAllMemoizedCaches · clearCache · clearvars · dbclear · dbstack · dbstatus · evalc · findprop · getcallinfo · inputParser · isa · ischar · isdeployed · iskeyword · ismethod · isobject · isstring · isUnderlyingType · keyboard · matlab.metadata.DynamicProperty.delete · memoize · metaclass · mislocked · mlock · munlock · namelengthmax · onCleanup · stats · superclasses · underlyingType · verLessThan · version · which · who · whos
Open-source implementation
Unlike proprietary runtimes, every RunMat function is open-source. Read exactly how dbtype is executed, line by line, in Rust.
- View the source for dbtype in Rust on GitHub
- Learn how the RunMat runtime works
- Found a bug? Open an issue with a minimal reproduction.
About RunMat
RunMat is an open-source runtime that executes MATLAB-syntax code blazing on any GPU. It is licensed under the Apache 2.0 license.
- RunMat automatically optimizes your math for GPU execution on Apple, Nvidia, and AMD hardware. No code changes needed. Simulations that took hours now take minutes.
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