Reading binary files in matlab

Question

Aubai 2022-11-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1841913-reading-binary-files-in-matlab

评论： Aubai 2022-11-10

Dear All,

I have the following code in Python (which is working for me) how can i made the same code in Matlab?

import IMCtermite
import numpy as np
import os
import matplotlib.pyplot as plt
imc_path = r'C:\Users\00037218\Desktop\Disctop_Temp\Bet\FAMOS_Load_Data_New\RawData\MQTTClient_1_WGEN1_RotSpdGyro.raw'
def get_data(path, record_size, data_type):
    """
    Returns the data as numpy array
    Args:
        path: str               The path of the IMC file to analyse
        record_size: int        The number of byte of a single raw data record entry
        data_type: np.dtype     Numpy data type, suitable raw data record structure
    Note:
        This function assumes a specific raw data format:
        6 bytes integer followed by double (8 bytes float)
    Returns:
        data:   an ndarray of tuples: (ndarray, float)
                sample:
                    [([84,  1,  0,  0,  0,  0], 0.476667), ([62,  5,  0,  0,  0,  0], -0.571667), ... ]
    """
    data = None
    if os.path.exists(path):
        try:
            with open(path, 'rb') as imc_file:
                # read in data file and search for start of raw data
                data    = imc_file.read()
                n       = data.find(b'|CS')                     # search for start of raw data block
                for i in range(4):                              # raw data starts immediately after 4th ','
                    n       = data.find(b',', n+1)
                data        = data[n+1:-1]                      # data = "raw data"; n+1 = first byte after ',' # -1 because of ';' as delimiter at the end of the raw data
                length      = len(data)
                remainder   = length % record_size
                if remainder != 0:
                    print(f'WARNING: Data length is not as expect a multiple of {bytes}: {length} -> remainder={remainder}')
                    data     = data[0:-remainder]               # make data a multiple of the expected record size
                data    = np.frombuffer(data, dtype=data_type)  # data is now numpy data array created from "raw data"
        except Exception as e:
            print(f'Exception occured: {e}')
    return data
if __name__ == '__main__':
	bytes1   = 6 + 8                                     # 6 bytes int values followed by 8 bytes float value
	dtype   = np.dtype([('x', 'u1', 6), ('y', 'f8')])   # HERE adapt data format according to raw data structure
	RotSpdGyro = get_data(imc_path, bytes1, dtype)
	data = []
	datax = []
	datay = []
	for entry in RotSpdGyro:
		a, y = entry
		x = int.from_bytes(a, signed=False, byteorder='little')
		data.append([x,y])
		datax.append(x)
		datay.append(y)
		#print(f'x={x}, y={y}')
	plt.plot(datax,datay)
	plt.show()

main issue for me this the following:

how to program is line of code in matlab:

    bytes1   = 6 + 8                                     # 6 bytes int values followed by 8 bytes float value
	dtype   = np.dtype([('x', 'u1', 6), ('y', 'f8')])   # HERE adapt data format according to raw data structure