How to generate random uint64 values
22 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Tammy Kolda
el 12 de Jun. de 2021
Comentada: Tammy Kolda
el 15 de Jun. de 2021
MATLAB supports uint64. I need to generate random uint64 values, e.g., greater than (2^52-1) which is the largest that can be represented as a double with its 52-bit mantissa. (Or is it 53 bit?) In any case, I want to be able to go all the way up to intmax('uint64') if needed. But there does not seem to be any support for this. The following command produces an error, but this is essentially what I'm looking for...
r = randi(intmax('uint64'),100,1,'uint64')
Presumably I could generate two 'uint32' arrays and convert them to uint64, but I'm wondering if there are any builtin ideas.
I'm currently using MATLAB R2020b.
Thanks in advance for any ideas.
Respuesta aceptada
Más respuestas (2)
Bruno Luong
el 12 de Jun. de 2021
I can't see why you are reluctant to generate 2 x 4 bytes
r = typecast(randi(intmax('uint32'),2*100,1,'uint32'),'uint64')
Bruno Luong
el 14 de Jun. de 2021
Editada: Bruno Luong
el 14 de Jun. de 2021
maxval = int64(2^60);
n = 100;
twop32 = 2^32;
q = double(maxval/twop32);
hi = floor(q*rand(1,n));
himax = floor(q);
lomax = twop32 + zeros(1,n);
lomax(hi == himax) = mod(maxval,twop32);
lo = ceil(lomax.*rand(1,n));
r = uint64(lo) + uint64(twop32)*uint64(hi);
disp(r)
Ver también
Categorías
Más información sobre Logical en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!