How can I merge vector elements into a single number of type double?

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Hello,
How can I transform this vector:
v=[1 2 3]
into this scalar of type double?:
k=123
Thank you,
Lazaros.

Respuesta aceptada

Guillaume
Guillaume el 4 de Feb. de 2019
Editada: Guillaume el 4 de Feb. de 2019
k = polyval(v, 10)
is probably the easiest.
This assume of course that each element of v is an integer in the range [0-9].

Más respuestas (2)

Jan
Jan el 4 de Feb. de 2019
Editada: Jan el 4 de Feb. de 2019
x = [1,2,3];
d = x * 10 .^ (numel(x)-1:-1:0).' % dot product

YT
YT el 4 de Feb. de 2019
Editada: YT el 4 de Feb. de 2019
Something like this?
A = [1 2 3];
joined = str2num(strjoin(num2cell(num2str(A(:))),''));
%>> joined = 123 (type double)
There are probably some more elegant solutions, but this is what I came up with for now.
  3 comentarios
YT
YT el 4 de Feb. de 2019
Editada: YT el 4 de Feb. de 2019
Looks much better. Thanks, learned something new today. The only downside to this is that, like you stated in your polyval solution, that this also only works correctly for positive integers.
Guillaume
Guillaume el 5 de Feb. de 2019
Indeed but that is most likely the case I assume.
A simpler, yet more generic solution, using number->string->number conversion:
str2num(strjoin(compose('%d', A), ''))

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