Single bit read returning invalid precision

code to read a .wdq file is returning an invalid precision error when reading one bit.

info.hiResFile = fread(fid, 1, '*ubit1');

is the line refrenced in this error:

error: fread: invalid PRECISION specified

but as far as I can tell '*ubit1' is a valid precision value to read a single bit of data.

[Walter Roberson]

Which MATLAB version are you using?

Answer 1

[David Hill]

b=fread('a.wdq',1,'ubit1');%this does not work?

[Walter Roberson]

The first parameter to fread() must be a file identifier, not a file name.

filename = 'a.wdq';
[fid, msg] = fopen(filename, 'r');
if fid < 0
    error('failed to open file "%s" because "%s"', filename, msg);
end
b = fread(fid, 1, 'ubit1')