A Simple Question

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From: Pedro Manuel on 21 Nov 2009 17:47

---

Hi Virtualized,

Here is your code:

P=[1,2];

if P(1) == 0
return;
else
P1=P(1);

if P(2) == 0
return;
else
P2=P(2);

if P(3) == 0 %problem in this line
return;
else
P3=P(3);
end
end
end

Your problem is in the line 13, there you are asking a question to computer: is P(3) equal to 0? However you don't have in your matrix any value in that position, therefore the computer doesn't have any number to compare... and that's why you have the error...

If you change your matrix P to P=[1,2,3], you'll not have any problem...

Virtualized <razzaqadil(a)gmail.com> wrote in message <346ea9a3-b20a-497b-a4eb-dab001daf391(a)k4g2000yqb.googlegroups.com>...
> On Nov 21, 10:43?pm, MatlabFCT NG <matfc...(a)gmail.com> wrote:
> > Could you please structure better your script?
> >
> > On 21 Nov, 21:12, Virtualized <razzaqa...(a)gmail.com> wrote:
> >
> >
> >
> > > Hi Everybody
> >
> > > I have the following simple script:
> >
> > > if P(1) == 0
> > > ? ? ? ? ?return;
> > > ? ? ?else
> > > ? ? ? ? ?P1=P(1)
> >
> > > ? ? ?if P(2) == 0
> > > ? ? ? ? ?return;
> > > ? ? ?else
> > > ? ? ? ? ?P2=P(2)
> >
> > > ? ? ? ? ?if P(3) == 0
> > > ? ? ? ? ?return;
> > > ? ? ?else
> > > ? ? ? ? ?P3=P(3)
> > > ? ? ?end
> > > ? ? ? ? ?end
> > > ? ? ?end
> >
> > > If i don't have any value at any location of the matrix or if the
> > > value is "0" ?then i want the program to stop executing.
> >
> > > Suppose i have
> >
> > > P=[1,2 ];
> >
> > > Here i have only two values for P(1) and P(2) so when i execute script
> > > then i get the following error:
> >
> > > ??? Attempted to access P(3); index out of bounds because numel(P)=2.
> >
> > > Error in ==> p at 13
> > > ? ? ? ? ?if P(3) == 0
> >
> > > Any help in this regard is highly appreciated.
> >
> > > Regards
>
> Sorry for the previous post. I am going to rewrite it again:
>
> if P(1) == 0
> return;
> else
> P1=P(1);
>
> if P(2) == 0
> return;
> else
> P2=P(2)
>
> if P(3) == 0
> return;
> else
> P3=P(3)
> end
>
> end
>
> end
>
>
> When i give it the following vector as input:
>
> P=[1,2 ];
>
> I get the following error:
>
> ??? Attempted to access P(3); index out of bounds because numel(P)=2.
>
> Error in ==> p at 13
> if P(3) == 0
>
>
> Thank you for your response.
>
> Regards

From: Virtualized on 21 Nov 2009 18:05

---

On Nov 21, 11:47 pm, "Pedro Manuel " <matfc...(a)gmail.com> wrote:
> Hi Virtualized,
>
> Here is your code:
>
> P=[1,2];
>
> if P(1) == 0
>     return;
> else
>     P1=P(1);
>
>     if P(2) == 0
>         return;
>     else
>         P2=P(2);
>
>         if P(3) == 0 %problem in this line
>             return;
>         else
>             P3=P(3);
>         end
>     end
> end
>
> Your problem is in the line 13, there you are asking a question to computer: is P(3) equal to 0? However you don't have in your matrix any value in that position, therefore the computer doesn't have any number to compare... and that's why you have the error...
>
> If you change your matrix P to P=[1,2,3], you'll not have any problem....
>
>
>
> Virtualized <razzaqa...(a)gmail.com> wrote in message <346ea9a3-b20a-497b-a4eb-dab001daf...(a)k4g2000yqb.googlegroups.com>...
> > On Nov 21, 10:43?pm, MatlabFCT NG <matfc...(a)gmail.com> wrote:
> > > Could you please structure better your script?
>
> > > On 21 Nov, 21:12, Virtualized <razzaqa...(a)gmail.com> wrote:
>
> > > > Hi Everybody
>
> > > > I have the following simple script:
>
> > > > if P(1) == 0
> > > > ? ? ? ? ?return;
> > > > ? ? ?else
> > > > ? ? ? ? ?P1=P(1)
>
> > > > ? ? ?if P(2) == 0
> > > > ? ? ? ? ?return;
> > > > ? ? ?else
> > > > ? ? ? ? ?P2=P(2)
>
> > > > ? ? ? ? ?if P(3) == 0
> > > > ? ? ? ? ?return;
> > > > ? ? ?else
> > > > ? ? ? ? ?P3=P(3)
> > > > ? ? ?end
> > > > ? ? ? ? ?end
> > > > ? ? ?end
>
> > > > If i don't have any value at any location of the matrix or if the
> > > > value is "0" ?then i want the program to stop executing.
>
> > > > Suppose i have
>
> > > > P=[1,2 ];
>
> > > > Here i have only two values for P(1) and P(2) so when i execute script
> > > > then i get the following error:
>
> > > > ??? Attempted to access P(3); index out of bounds because numel(P)=2.
>
> > > > Error in ==> p at 13
> > > > ? ? ? ? ?if P(3) == 0
>
> > > > Any help in this regard is highly appreciated.
>
> > > > Regards
>
> > Sorry for the previous post. I am going to rewrite it again:
>
> >   if P(1) == 0
> >         return;
> >     else
> >         P1=P(1);
>
> >       if P(2) == 0
> >         return;
> >       else
> >          P2=P(2)
>
> >            if P(3) == 0
> >            return;
> >           else
> >          P3=P(3)
> >         end
>
> >        end
>
> > end
>
> > When i give it the following vector as input:
>
> > P=[1,2 ];
>
> > I get the following error:
>
> > ??? Attempted to access P(3); index out of bounds because numel(P)=2.
>
> > Error in ==> p at 13
> >         if P(3) == 0
>
> > Thank you for your response.
>
> > Regards

Hi

Yes i know that. But as i stated in my first message, i want to check
both conditions if
(1) either P(3) or P(2) or P(1) == 0 or
(2) there is no value at any location

then program should execute the "return" statement.

Thank you once again for your help.

Regards

From: Pedro Manuel on 21 Nov 2009 18:40

---

Hi again :),

Even if you don't have any matrix P, you want to make your program return... Is that it?
Maybe you can use try catch, is not a fancy way to do it. I'm sorry but i don't remember other now.
**********************
try
% your code
catch
return
end
**********************

From: Jan Simon on 22 Nov 2009 06:55

---

Dear Virtualized!

> Yes i know that. But as i stated in my first message, i want to check
> both conditions if
> (1) either P(3) or P(2) or P(1) == 0 or
> (2) there is no value at any location

Do you mean:
if ~all(P) || length(P) < 3
return;
end

Kind regards, Jan

From: Virtualized on 22 Nov 2009 07:21

---

On Nov 22, 12:55 pm, "Jan Simon" <matlab.THIS_Y...(a)nMINUSsimon.de>
wrote:
> Dear Virtualized!
>
> > Yes i know that. But as i stated in my first message, i want to check
> > both conditions if
> > (1) either P(3) or P(2) or P(1) == 0 or
> > (2) there is no value at any location
>
> Do you mean:
>   if ~all(P) || length(P) < 3
>     return;
>   end
>
> Kind regards, Jan

Dear Jan

Thanks a lot.

Yes that is exactly what i wanted to achieve.

Best Regards

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