# mat 7.3
Load MATLAB 7.3 .mat files into Python.
Starting with MATLAB 7.3, `.mat` files have been changed to store as custom `hdf5` files.
This means they cannot be loaded by `scipy.io.loadmat` any longer and raise.
```Python
NotImplementedError: Please use HDF reader for matlab v7.3 files, e.g. h5py
```
## Quickstart
This library loads MATLAB 7.3 HDF5 files into a Python dictionary.
```Python
import mat73
data_dict = mat73.loadmat('data.mat')
```
As easy as that!
By enabling `use_attrdict=True` you can even access sub-entries of `structs` as attributes, just like in MATLAB:
```Python
data_dict = mat73.loadmat('data.mat', use_attrdict=True)
struct = data_dict['structure'] # assuming a structure was saved in the .mat
struct[0].var1 == struct[0]['var1'] # it's the same!
```
You can also specifiy to only load a specific variable or variable tree, useful to reduce loading times
```Python
data_dict = mat73.loadmat('data.mat', only_include='structure')
struct = data_dict['structure'] # now only structure is loaded and nothing else
data_dict = mat73.loadmat('data.mat', only_include=['var/subvar/subsubvar', 'tree1/'])
tree1 = data_dict['tree1'] # the entire tree has been loaded, so tree1 is a dict with all subvars of tree1
subsubvar = data_dict['var']['subvar']['subsubvar'] # this subvar has been loaded
```
## Installation
To install, run:
```
pip install mat73
```
Alternatively for most recent version:
```
pip install git+https://github.com/skjerns/mat7.3
```
## Datatypes
The following MATLAB datatypes can be loaded
| MATLAB | Python |
| ------------------------ | ----------------- |
| logical | np.bool_ |
| single | np.float32 |
| double | np.float64 |
| int8/16/32/64 | np.int8/16/32/64 |
| uint8/16/32/64 | np.uint8/16/32/64 |
| complex | np.complex128 |
| char | str |
| struct | list of dicts |
| cell | list of lists |
| canonical empty | [] |
| missing | None |
| sparse | scipy.sparse.csc |
| Other (ie Datetime, ...) | Not supported |
## Short-comings
- This library will __only__ load mat 7.3 files. For older versions use `scipy.io.loadmat`
- Proprietary MATLAB types (e.g `datetime`, `duriation`, etc) are not supported. If someone tells me how to convert them, I'll implement that
- For now, you can't save anything back to the .mat. It's a bit more difficult than expected, so it's not on the roadmap for now
- See also [hdf5storage](https://github.com/frejanordsiek/hdf5storage), which can indeed be used for saving .mat, but has less features for loading
- See also [pymatreader](https://gitlab.com/obob/pymatreader/) which has a (maybe even better) implementation of loading MAT files, even for older ones
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