Rounding off and approximation functions.

I have a matlab formula i.e,

Nsymb = (abs(Dcum)*deltaf(sp)*(lam^2)* Symbolrate* 1e-3)/clight

The value of Nysmb varies i.e 14, 10, 28, 36..

I would love to round off to the nearest power factor of 2. For example if Nsymb from the formula is 14, i want to write the code to make Nsymb = 16.

If Nysmb from the formula is 28, i want to make Nsymb =32... if 36, Nsymb=64.. so on.

How can i do this?

Thanks in advance.

[James Tursa]

Nearest in the actual number sense, or nearest in a log2 sense?

[Reinhardt RADING]

In number.

How do you propose using log2?

[the cyclist]

Maybe I have not had enough coffee yet, but why would 36 round to 64? It is much closer to 32.

Or do you mean ceiling, and not round? Or maybe just a typo in your question?

Answer 1

[Steven Lord]

N = 14;
x = 2.^nextpow2(N)

x = 16

[the cyclist]

Always a new MATLAB function to know.

[Reinhardt RADING]

This is brilliant.

Thanks for helping.

[Steven Lord]

Always a new MATLAB function to know.

Cool, you're one of today's ten thousand to learn about this 20+ year old function.