Yes, that happens to me too.
If I try to run this, I get a similar message:
[status,result] = system['python test.py'];
Almost certainly, if you fired up a command prompt and ran "python rat.py", you'd get the same response.... because your path doesn't have your python app in it.
SOLUTION:
1] Find out where it's installed.
For example, on my system, python.exe is installed here:
c:\apps\anaconda3\python.exe
2] So just modify your system call and add the full path, like this:
[status,result] = system['c:\apps\anaconda3\python test.py'];
This worked for me
In general terms, you can almost always solve this by opening a system command prompt and find out exactly what you have to enter at the command prompt to get everything running. That's effectively what happens when you make a system call.
If you require multiple OS commands to run at the command prompt [changing dirs, etc], then put them all into 1 batch file [.bat] and execute the batch file.
You can call functionality from Python® libraries or execute Python statements directly from MATLAB®.
Access Python Modules
To access Python libraries, add the py.
prefix to the Python name. For example:
py.list[{'This','is a','list'}] % Call built-in function list py.textwrap.wrap['This is a string'] % Call wrap function in module textwrap
For more information, see Access Python Modules from MATLAB - Getting Started.
Run Python Code
To execute Python statements in the Python interpreter from the MATLAB command prompt, use the pyrun
function.
With this function, you can run code that passes MATLAB types as input and returns some or all of the variables back to MATLAB. For example, suppose that you run this statement in a Python interpreter.
>>> l = ['A', 'new', 'list']
To run the statement from MATLAB, use pyrun
. To return the result to a MATLAB variable myList
, add "l"
as an outputs
argument:
myList = pyrun["l = ['A', 'new', 'list']", "l"];
Run Python Scripts
To call a Python script from the MATLAB command prompt, use the pyrunfile
function. You pass MATLAB data and return variables the same way as with pyrun
. For example, create a mklist.py
file with these statements:
# Python script file mklist.py: s = 'list' L = ['A', 'new', s]
Run the script from MATLAB:
myListFile = pyrunfile["mklist.py", "L"]
myListFile = Python list with no properties. ['A', 'new', 'list']
Access to Python Variables
When you use the py.
prefix, MATLAB imports the entire module and can access all functions and classes of the Python code. However, when you execute Python code using the pyrun
or pyrunfile
functions, if you want to access Python data you must explicitly return Python objects to MATLAB using the outvars
argument.
Limitations to pyrun
and pyrunfile
Functions
Python classes defined using pyrun
or pyrunfile
cannot be modified if you return an instance of the class to MATLAB. If you need to change class definitions, restart the interpreter session:
terminate[pyenv] pyenv["ExecutionMode","OutOfProcess"]
Alternatively, restart MATLAB for "InProcess"
.
The pyrun
and pyrunfile
functions do not support classes with local variables that are initialized by other
local variables through methods. For such usage, create a module and access it using the py.
prefix.
See Also
pyrun
|
pyrunfile
Related Topics
- Access Python Modules from MATLAB - Getting Started
Directly call Python® functionality from MATLAB®
You can access Python libraries directly from MATLAB by adding the py.
prefix to the Python name. See Access Python Modules from MATLAB - Getting Started. For example:
py.list[{'This','is a','list'}] % Call built-in function list py.textwrap.wrap['This is a string'] % Call wrap function in module textwrap
You can execute Python statements in
the Python interpreter directly from MATLAB using the pyrun
or pyrunfile
functions. For example:
pyrun["l = ['A','new','list']"] % Call list in Python interpreter
For more information, see Directly Call Python Functionality from MATLAB.
If instead you want to call MATLAB functions from Python applications, see Call MATLAB from Python for more information.
Functions
expand all
Environment
pyenv
| Change default environment of Python interpreter |
PythonEnvironment
| Python environment information |
Run Python Code
pyrun
| Run Python statements from MATLAB |
pyrunfile
| Run Python script file from MATLAB |
Keyword Arguments
pyargs
| Create keyword arguments for Python function |
Exception Handling
matlab.exception.PyException
| Capture error information for Python exception |
Topics
Use Python Libraries in MATLAB
- Access Python Modules from MATLAB - Getting Started
How to create and use a Python object in MATLAB. - Configure Your System to Use Python
How to verify you have installed a supported version of Python. - Call User-Defined Python Module
Create a Python module used by examples in this documentation. - Understand Python Function Arguments
Python method syntax which might be unfamiliar to MATLAB users. - Advanced Topics
Code pattern differences you should be aware of. - Out-of-Process Execution of Python Functionality
Execute Python scripts in processes that are separate from the MATLAB process. - Reload Out-of-Process Python Interpreter
Reload out-of-process Python interpreter without restarting MATLAB.
Run Python Code from MATLAB
- Directly Call Python Functionality from MATLAB
Ways to call Python from MATLAB.
Passing Data
- MATLAB to Python Data Type Mapping
How MATLAB converts MATLAB data into compatible Python data types. - Access Elements in Python Container Types
A Python container is typically a sequence type [list
ortuple
] or a mapping type [dict
]. - Pass Python Function to Python map Function
This example shows how to display the length of each word in a list.
Troubleshooting
Determine if Error is Python or MATLAB Error
Tips to determine if an error originates in Python or MATLAB code.
- Unable to resolve the name py.myfunc
- Debug Python Code Using MATLAB Interface
Limitations to Python Support
Python features not supported in MATLAB.
Handle Python Exceptions
MATLAB catches exceptions thrown by Python and converts them into a matlab.exception.PyException
object.
Troubleshooting Matrix and Numeric Argument Errors
Error might be caused by input array with more than one non-singleton dimension.
Error Converting Elements of list or tuple
How to use string and numeric converters for list
and tuple
types.
Featured Examples
Call Python Function in MATLAB to Wrap Paragraph Text
Use Python language functions and modules within MATLAB. The example calls a text-formatting module from the Python standard library.
Open Live Script
Use Python Numeric Variables in MATLAB
Use Python numeric variables with MATLAB.
Open Live Script
Use Python str Variables in MATLAB
Use Python str
variables with MATLAB.
Open Live Script
Use Python list Variables in MATLAB
Use Python list
variables with MATLAB.
Open Live Script
Use Python tuple Variables in MATLAB
Use Python tuple
variables with MATLAB.
Open Live Script
Use Python dict Variables in MATLAB
Use Python dict
variables with MATLAB.
Open Live Script