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From: Prashant Somani on 24 Jul 2010 07:53
I have tried following code for array st as mentioned

Array:
st =

Columns 1 through 16

38 0 0 0 0 0 0 0 0 0 0 18 0 0 0 0

Columns 17 through 32

0 0 0 0 0 0 0 17 0 0 0 0 0 0 0 0

Columns 33 through 39

0 0 0 0 0 0 0


Code:
while i<=size(st,2)
if st(i)~=0
ts(k)=st(i);
k=k+1;
c=0;
i=i+1;
else
while st(i)==0
c=c-1;
if i<38
i=i+1;
else
break
end
end
ts(k)=c;
k=k+1;
end
end

What i want to do is sotre nonzero values as itis and count zero and put its value in same array.
From: John D'Errico on 24 Jul 2010 09:19
"Prashant Somani" <p.m.somani(a)gmail.com> wrote in message <i2ek6u$ohq$1(a)fred.mathworks.com>...
> I have tried following code for array st as mentioned
>
> Array:
> st =
>
> Columns 1 through 16
>
> 38 0 0 0 0 0 0 0 0 0 0 18 0 0 0 0
>
> Columns 17 through 32
>
> 0 0 0 0 0 0 0 17 0 0 0 0 0 0 0 0
>
> Columns 33 through 39
>
> 0 0 0 0 0 0 0
>
>
> Code:
> while i<=size(st,2)
> if st(i)~=0
> ts(k)=st(i);
> k=k+1;
> c=0;
> i=i+1;
> else
> while st(i)==0
> c=c-1;
> if i<38
> i=i+1;
> else
> break
> end
> end
> ts(k)=c;
> k=k+1;
> end
> end
>
> What i want to do is sotre nonzero values as itis and count zero and put its value in same array.

shiver

.... Long, convoluted code that I'm not going to bother
to follow and apparently fails to work anyway, all to do
something trivial.

% store the non-zero elements of st
ts = st(st ~= 0);

If you wish to count the number of zeros, you might
do something like this:

count = numel(st) - numel(ts);

Or to do it directly, do this:

count = sum(st == 0);

Learn to use the capabilities of matlab. Use vector
operations that operate on entire arrays, not loops.

John
From: Jan Simon on 24 Jul 2010 09:23
Dear Prashant,

What is your question? Any errors? Does the result differ from the expectations? Is it slow?

Kind regards, Jan
From: dpb on 24 Jul 2010 09:20
Prashant Somani wrote:
> I have tried following code for array st as mentioned
>
> Array:
> st =
>
> Columns 1 through 16
> 38 0 0 0 0 0 0 0 0 0 0 18 0 0 0 0
> Columns 17 through 32
> 0 0 0 0 0 0 0 17 0 0 0 0 0 0 0 0
> Columns 33 through 39
> 0 0 0 0 0 0 0
>
....[code elided for brevity]...
> What i want to do is sotre nonzero values as itis and count zero and put
> its value in same array.

I'm not completely sure what you mean by "put its value in same array"
but the two pieces of information are

ts = st(st~=0); % save nonzero values in ts
nz = sum(st==0); % count number zeros

Alternatively,

nz = length(st)-length(ts);

If the last part is that you want to append the count to the list of
nonzero values then

ts = [ts nz];

--
From: dpb on 24 Jul 2010 17:08
dpb wrote:
....

> ts = st(st~=0); % save nonzero values in ts
....
Of course, if don't need it for something else, if the point is to
retain the nonzero values of st, then

st(st==0) = [];

is yet another cat...

--
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