Is there a way to read 16bit float(mantissa 8bit)bin file?

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Won Geun Shin 2022-9-2

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https://ww2.mathworks.cn/matlabcentral/answers/1793380-is-there-a-way-to-read-16bit-float-mantissa-8bit-bin-file

编辑： James Tursa 2022-9-7

采纳的回答： Walter Roberson

I've found a function CustomFloat but I can't find a way to read the file...

it goes like this

00 00 07 00 F8 FF FD FF 01 00 01 00 01 00 FF FF

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Won Geun Shin 2022-9-7

so I guess I can use bin2num function to covert that..

Thanks a lot

James Tursa 2022-9-7

编辑：James Tursa 2022-9-7

@Walter Roberson Would also need to know whether the significand is normalized to 1.0 binary or 0.1 binary. This ties in with the exponent bias, of course.

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采纳的回答

Walter Roberson 2022-9-7

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https://ww2.mathworks.cn/matlabcentral/answers/1793380-is-there-a-way-to-read-16bit-float-mantissa-8bit-bin-file#answer_1046915

在 MATLAB Online 中打开

str = "00 00 07 00 F8 FF FD FF 01 00 01 00 01 00 FF FF 46 C0 B9 40"
str = "00 00 07 00 F8 FF FD FF 01 00 01 00 01 00 FF FF 46 C0 B9 40"
A = sscanf(str, "%2x", [1 inf]);
if mod(numel(A), 2) == 1; A(end+1) = 0; end   %pad if odd length
MSB = A(1:2:end);
mask = MSB >= 128;
MSB(mask) = MSB(mask) - 256;
LSB = A(2:2:end);
out = MSB + LSB/256;
format long g
out.'
ans = 10×1
                         0
                         7
               -7.00390625
               -2.00390625
                         1
                         1
                         1
               -0.00390625
                     70.75
                    -70.75

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更多回答（1 个）

Chunru 2022-9-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1793380-is-there-a-way-to-read-16bit-float-mantissa-8bit-bin-file#answer_1042005

在 MATLAB Online 中打开

str = "00 00 07 00 F8 FF FD FF 01 00 01 00 01 00 FF FF"
str = "00 00 07 00 F8 FF FD FF 01 00 01 00 01 00 FF FF"
a = sscanf(str, "%s%s", inf);
n = floor(length(a)/4)
n = 8
afi = fi(0, 1, 16, 7);  % signed, 16-bit word, 7-bit fraction
for i=1:n
    h = a((i-1)*4 + (1:4));       % the hex from data input    
    afi.hex = h;                  % assign the hex to fi
    d = afi.double;               % convert to double 
    fprintf("%s : %f\n", afi.hex, afi.double)
end
0000 : 0.000000
0700 : 14.000000
f8ff : -14.007812
fdff : -4.007812
0100 : 2.000000
0100 : 2.000000
0100 : 2.000000
ffff : -0.007812