vartype — Create a table variable type selector.
vartype(type) creates a selector with a Type property for table variable type selection workflows.
Syntax
B = tabularBuiltin(A, ...)Inputs
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
A | Any | Yes | — | Input value. |
args | Any | Variadic | — | Name-value options or conversion arguments. |
Returns
| Name | Type | Description |
|---|---|---|
out | Any | Result value. |
Errors
| Identifier | When | Message |
|---|---|---|
RunMat:table:InvalidArgument | Arguments or table metadata are invalid. | table: invalid argument |
RunMat:table:InvalidIndex | Table indexing is invalid. | table: invalid index |
RunMat:table:InvalidVariable | A table variable name or value is invalid. | table: invalid variable |
RunMat:readtable:IOError | readtable cannot open or read the requested file. | readtable: file read failed |
RunMat:readtable:UnsupportedFileType | readtable receives a file type outside the text or spreadsheet import backends. | readtable: unsupported file type |
How vartype works
typemust be a string scalar or character row vector.- The selector can be used as a table or timetable variable subscript.
- Supported categories include numeric, logical, string, cell, categorical, datetime, duration, integer, and all.
- The text selector
"integer"selects integer variables; it is not an integer-valued argument. Numeric and provider-resident values are rejected before provider access.
Example
Select numeric variables
T(:, vartype('numeric'))Expected output:
Table containing numeric variablesUsing vartype with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how vartype changes the result.
Run a small vartype example, explain the result, then change one input and compare the output.
Related Table functions
array2table · array2timetable · categorical · cell2table · dictionary · groupsummary · head · height · iscategorical · isordinal · istable · istimetable · ordinal · pivot · rowfilter · struct2table · table · table2array · table2cell · table2struct · table2timetable · timerange · timetable · timetable2table · uitable · width
Open-source implementation
Unlike proprietary runtimes, every RunMat function is open-source. Read exactly how vartype is executed, line by line, in Rust.
- View the source for vartype 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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