Convert System.Byte[] memory dump to numeric data without fwrite/fread?
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Hi,
from a .NET application I get System.Byte[] array data that contain memory dumps with numerical data of several types (int16, int32, ieee float) inside. I want to process these data in Matlab.
>> whos data
Name Size Bytes Class Attributes
data 1x1 8 System.Byte[]
>> data
data =
Byte[] with properties:
Length: 65536
LongLength: 65536
Rank: 1
SyncRoot: [1×1 System.Byte[]]
IsReadOnly: 0
IsFixedSize: 1
IsSynchronized: 0
The following code does the job for single precision float data, it returns a 16384 array fdata made from the 4 x 16384 = 65536 bytes (other data types similar):
% convert to matlab array, see
% https://de.mathworks.com/matlabcentral/answers/46827-fast-transfer-of-net-array-to-matlab-array
bdata = data.uint8;
% write memory dump to file
fid = fopen('tmp.bin', 'w');
fwrite(fid, bdata);
fclose(fid);
% read file e.g. as ieee single precision float
fid = fopen('tmp.bin', 'r');
fdata = fread(fid, inf, 'single');
fclose(fid);
Is there a way to to this faster in memory without using a temporary file?
Thanks & regards,
Frank
Antworten (1)
Steven Remington
am 15 Jan. 2019
There are a couple options. MATLAB has a typecasting function which allows you to convert data types.
More information about that process can be found at the follow doc page:
With that you should be able to select columns from your data in order to convert to the correct data type.
Another option would be to use "textscan" with a format to bulk read data of different data types from the file if you have a complex formatted file. Some examples of this is shown below:
https://www.mathworks.com/help/matlab/ref/textscan.html
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