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From: Gumah on 1 May 2010 22:11
Hi all
say we have:
A=[ 0 0 0 1 1 1 0 0 0]
how to use the operator ~ to convert only the third element from 0
into 1 so we will have:
A=[ 0 0 1 1 1 1 0 0 0]
From: Gumah on 1 May 2010 23:05
On May 2, 10:11 am, Gumah <alrjele2...(a)gmail.com> wrote:
> Hi all
> say we have:
>  A=[ 0 0 0 1 1 1 0 0 0]
> how to use the operator ~ to convert only the third element from 0
> into 1 so we will have:
> A=[ 0 0 1 1 1 1 0 0 0]

Sorry..The question should be like that: how can I convert a specific
element in array that represent a binary image from black into white
A=[ 0 0 0 0 0 0 0 0 0 0
0 0 0 1 1 1 1 0 0 0
0 0 0 0 0 0 0 0 0 0]
This array reperesent an image of line.. say I wanna make this line
longer.. thus I want to convert the second element in the third column
from 0 into 1 so A will be look like:
A=[ 0 0 0 0 0 0 0 0 0 0
0 0 1 1 1 1 1 0 0 0
0 0 0 0 0 0 0 0 0 0]
any body knows how to do that?
From: Matt Fig on 1 May 2010 23:59
Why not just simply:

A(2,3) = 1;
From: Walter Roberson on 2 May 2010 00:11
Gumah wrote:
> On May 2, 10:11 am, Gumah <alrjele2...(a)gmail.com> wrote:
>> Hi all
>> say we have:
>> A=[ 0 0 0 1 1 1 0 0 0]
>> how to use the operator ~ to convert only the third element from 0
>> into 1 so we will have:
>> A=[ 0 0 1 1 1 1 0 0 0]
>
> Sorry..The question should be like that: how can I convert a specific
> element in array that represent a binary image from black into white
> A=[ 0 0 0 0 0 0 0 0 0 0
> 0 0 0 1 1 1 1 0 0 0
> 0 0 0 0 0 0 0 0 0 0]
> This array reperesent an image of line.. say I wanna make this line
> longer.. thus I want to convert the second element in the third column
> from 0 into 1 so A will be look like:
> A=[ 0 0 0 0 0 0 0 0 0 0
> 0 0 1 1 1 1 1 0 0 0
> 0 0 0 0 0 0 0 0 0 0]
> any body knows how to do that?

If necessary, you could use code like this:

NOT = @(V) true(1) - V&V;

Rows = [2];
Cols = [3];
MatIdx = sub2idx(size(A), Rows, Cols);
NewAVector = vertcat(A(1:MatIdx), NOT(A(MatIdx)), A(MatIdx+1:end));
NewA = reshape(NewAVector, size(A));


PS: I don't claim the above code is _efficient_, but as you research
what it does, you should be able to figure out the very simple answer to
your question.
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