Thread Subject: how to create a row of 100 numbers of 1's and 0's?

Hi
I am trying to create a neural network and I need a variable
(called Targets) that will hold 100 numbers in one row,
which will be the target numbers. These numbers need to be
either 0 or 1 and need to be done in a random order in the
row of the variable Targets.
Something like this:
0 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 0 0 1 1 0 1 0 0
thanks

In article <fn3bpq$h2t$1@fred.mathworks.com>,
aristotelis aristou <aristo.telios@mathworks.com> wrote:
>I am trying to create a neural network and I need a variable
>(called Targets) that will hold 100 numbers in one row,
>which will be the target numbers. These numbers need to be
>either 0 or 1 and need to be done in a random order in the
>row of the variable Targets.
>Something like this:
>0 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 0 0 1 1 0 1 0 0

Targets = double(rand(1,100) > 0.5)

Leave out the double() if it is okay for Targets to be class logical

--
   So you found your solution
   What will be your last contribution?
   -- Supertramp (Fool's Overture)

roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) wrote in
message <fn3c0c$4l9$1@canopus.cc.umanitoba.ca>...
> Targets = double(rand(1,100) > 0.5)
>
> Leave out the double() if it is okay for Targets to be
class logical

Hi, thanks for the reply.
I tried to understand why the '> 0.5' gives 0 or 1 but I
cant. I know that if I remove the '> 0.5' it will give me
any random values or if I say '< 0.5' it gives the same
results as with the initial example you wrote . What if I
wanted to have random sequence of -1 and 1.
i.e. -1 1 1 -1 1 -1 -1 1 -1 -1 1 1 -1 1 -1

aristotelis aristou wrote:
> roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) wrote in
> message <fn3c0c$4l9$1@canopus.cc.umanitoba.ca>...
>> Targets = double(rand(1,100) > 0.5)
>>
>> Leave out the double() if it is okay for Targets to be
> class logical
>
> Hi, thanks for the reply.
> I tried to understand why the '> 0.5' gives 0 or 1 but I
> cant. I know that if I remove the '> 0.5' it will give me
> any random values or if I say '< 0.5' it gives the same
> results as with the initial example you wrote.

It returns the logical result of the comparison--> 1 for True, 0 for
False. Save the vector before the operation and do the comparison
visually. The change of the sign of the comparison would invert the
results, not return the same results.


> wanted to have random sequence of -1 and 1.
> i.e. -1 1 1 -1 1 -1 -1 1 -1 -1 1 1 -1 1 -1

Same thing except then substitute the -1 in place of the resulting zeros
something like x(x==0) = -1

--

In article <fn4up2$lmm$1@fred.mathworks.com>,
aristotelis aristou <aristo.telios@mathworks.com> wrote:
>roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) wrote in
>message <fn3c0c$4l9$1@canopus.cc.umanitoba.ca>...
>> Targets = double(rand(1,100) > 0.5)

>> Leave out the double() if it is okay for Targets to be
>class logical

>I tried to understand why the '> 0.5' gives 0 or 1 but I
>cant. I know that if I remove the '> 0.5' it will give me
>any random values or if I say '< 0.5' it gives the same
>results as with the initial example you wrote .

rand(1,100) produces a 1 x 100 matrix of random numbers
in the range (0,1) exclusive. For such values, there is
a 50% chance that the value will be above 1/2, so if you
compare the random value to 1/2, you will get "false"
or "true" each 50% of the time. In Matlab, false is
represented by 0, and true is represented by 1, so
the result is 1 x 100 matrix of values each with a
50% chance of being 0 or 1.

>What if I
>wanted to have random sequence of -1 and 1.
>i.e. -1 1 1 -1 1 -1 -1 1 -1 -1 1 1 -1 1 -1

Targets = 2 * (rand(1,100) > 0.5) - 1

The (rand(1,100) > 0.5) part produces 0 or 1, multiply that by 2 to
get 0 or 2, subtract 1 from that to get -1 or 1.

More generally, (maxval - minval) * (rand(1,100) > 0.5) + minval
--
   "Beware of bugs in the above code; I have only proved it correct,
   not tried it." -- Donald Knuth

roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) wrote in
message <fn4v62$5oi$1@canopus.cc.umanitoba.ca>...
> In article <fn4up2$lmm$1@fred.mathworks.com>,
> aristotelis aristou <aristo.telios@mathworks.com> wrote:
> >roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) wrote in
> >message <fn3c0c$4l9$1@canopus.cc.umanitoba.ca>...
> >> Targets = double(rand(1,100) > 0.5)
>
> >> Leave out the double() if it is okay for Targets to be
> >class logical
>
> >I tried to understand why the '> 0.5' gives 0 or 1 but I
> >cant. I know that if I remove the '> 0.5' it will give me
> >any random values or if I say '< 0.5' it gives the same
> >results as with the initial example you wrote .
>
> rand(1,100) produces a 1 x 100 matrix of random numbers
> in the range (0,1) exclusive. For such values, there is
> a 50% chance that the value will be above 1/2, so if you
> compare the random value to 1/2, you will get "false"
> or "true" each 50% of the time. In Matlab, false is
> represented by 0, and true is represented by 1, so
> the result is 1 x 100 matrix of values each with a
> 50% chance of being 0 or 1.
>
> >What if I
> >wanted to have random sequence of -1 and 1.
> >i.e. -1 1 1 -1 1 -1 -1 1 -1 -1 1 1 -1 1 -1
>
> Targets = 2 * (rand(1,100) > 0.5) - 1
>
> The (rand(1,100) > 0.5) part produces 0 or 1, multiply
that by 2 to
> get 0 or 2, subtract 1 from that to get -1 or 1.
>
> More generally, (maxval - minval) * (rand(1,100) > 0.5)
+ minval
> --
> "Beware of bugs in the above code; I have only proved
it correct,
> not tried it." --
Donald Knuth


Let try some other functions
    randint
    randsrc

Example
  randsrc(1,10)

Anh Huy Phan
RIKEN - BSI

thanks for the help guys

On Jan 22, 5:38=A0pm, "aristotelis aristou"
<aristo.tel...@mathworks.com> wrote:
> thanks for the help guys

round(rand(1,100))

Greg

Greg Heath <heath@alumni.brown.edu> wrote in message
<81e5d0f9-35ec-40bc-9d39-03ba4d63be6a@v46g2000hsv.googlegroups.com>...
> On Jan 22, 5:38=A0pm, "aristotelis aristou"
> <aristo.tel...@mathworks.com> wrote:
> > thanks for the help guys
>
> round(rand(1,100))
>
> Greg

nice and clean solution
thanks