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OPEN_MATLAB

The OPEN_MATLAB node loads a local file of the .mat file format. Note that if multiple 'tabs' of data are used, the number of rows must match in order to stack the arrays. Params: file_path : File path to the file to be loaded Returns: out : DataFrame DataFrame loaded from the .mat file
Python Code
from os import path

import numpy as np
import pandas as pd
from flojoy import DataFrame, File, flojoy
from scipy.io import loadmat


@flojoy
def OPEN_MATLAB(file_path: File | None = None) -> DataFrame:
    """The OPEN_MATLAB node loads a local file of the .mat file format.

    Note that if multiple 'tabs' of data are used, the number of rows must match in order to stack the arrays.

    Parameters
    ----------
    file_path : File
        path to the file to be loaded

    Returns
    -------
    DataFrame
        DataFrame loaded from the .mat file
    """

    if file_path == "":
        file_path = path.join(
            path.dirname(path.abspath(__file__)),
            "assets",
            "default.mat",
        )

    if file_path[-4:] != ".mat":
        raise ValueError(f"File type {file_path[-4:]} unsupported.")

    if not path.exists(file_path):
        raise ValueError("File path does not exist!")

    mat = loadmat(file_path)
    key = list(mat.keys())[3:]
    X = mat[key[0]]
    Y = mat[key[1]]

    df = pd.DataFrame(np.hstack((X, Y)))

    return DataFrame(df=df)

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Example

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React Flow mini map

In this example OPEN_MATLAB node is loading a default .mat file which is then partially visualized with a plotly visulizer node ARRAY_VIEW.