So, while using Fread to open a 4 byte I used uint32 and uint64 for 8 byte value. But what should i do if i want to read a 12 byte value.( for a 6 byte i used ubit(6*8) but cant use 12*8. Any suggessions?

Fread(fid, (precision) *ubit48, skip bytes) for a 6 byte value , so what precision should I use for 12 byte value? Thank you

Answer 1

[Jan]

data = fread(fid, 12, '*uint8');

Now you have the 12 single bytes. You can join the first 8 byte to a UINT64 using typecast:

low  = typecast(data(1:8),  'uint64');
high = typecast(data(9:12), 'uint32');

But you see, that you cannot store the result in an integer tyoe with 96 bits directly, because Matlab does not habe such a type. Search for "Matlab vpa" to learn how to use arithmetics with variable precision.

[ck]

Hey , thanks for that !!

for 4 byte is used the following instruction

fid=fopen('file.dat','r');
ac=fread(gid,[m,n],'*uint16',25854(skip),'b');
fclose(gid)

can u write down similarly for a 12 byte value??

thank you

[Walter Roberson]

You cannot do that for 12 byte values. Instead loop reading 12 buttons at a time and then fseek() forward by the skip.

If you have a sequence that regular you should consider using memmapfile

[ck]

sure thing, thanks !