Prev: 30 Days Free Trial Project Management Software
Next: How to generate a random strongly connected graph??
From: Peter Riddersholm on 16 Jun 2010 02:39
Let's say that there is a 5x5 array, A:

A=magic(5)

A =

17 24 1 8 15
23 5 7 14 16
4 6 13 20 22
10 12 19 21 3
11 18 25 2 9

What function will find the row and column number for the element with value 6?

I am sorry for this simple question, but I simply cannot find it :(

/peter
From: Bruno Luong on 16 Jun 2010 03:12
"Peter Riddersholm " <peri(a)dmi.dk> wrote in message <hv9ri9$ej$1(a)fred.mathworks.com>...
> Let's say that there is a 5x5 array, A:
>
> A=magic(5)
>
> A =
>
> 17 24 1 8 15
> 23 5 7 14 16
> 4 6 13 20 22
> 10 12 19 21 3
> 11 18 25 2 9
>
> What function will find the row and column number for the element with value 6?
>
> I am sorry for this simple question, but I simply cannot find it :(

You cannot FIND the function that can FIND row and column? Did you try "FIND"?

Bruno
From: Peter Riddersholm on 16 Jun 2010 04:55
"Bruno Luong" <b.luong(a)fogale.findmycountry> wrote in message <hv9tg3$17q$1(a)fred.mathworks.com>...
> "Peter Riddersholm " <peri(a)dmi.dk> wrote in message <hv9ri9$ej$1(a)fred.mathworks.com>...
> > Let's say that there is a 5x5 array, A:
> >
> > A=magic(5)
> >
> > A =
> >
> > 17 24 1 8 15
> > 23 5 7 14 16
> > 4 6 13 20 22
> > 10 12 19 21 3
> > 11 18 25 2 9
> >
> > What function will find the row and column number for the element with value 6?
> >
> > I am sorry for this simple question, but I simply cannot find it :(
>
> You cannot FIND the function that can FIND row and column? Did you try "FIND"?
>
> Bruno

I might not be the best ML programmer, but could you help me a bit further?

[row,col]=find(A)

returns the indices of nonzero elements. How do I get - for instance - the row and column number for the element with value 6 using find?

/peter
From: Jos (10584) on 16 Jun 2010 05:34
"Peter Riddersholm " <peri(a)dmi.dk> wrote in message <hva3hq$nhp$1(a)fred.mathworks.com>...
> "Bruno Luong" <b.luong(a)fogale.findmycountry> wrote in message <hv9tg3$17q$1(a)fred.mathworks.com>...
> > "Peter Riddersholm " <peri(a)dmi.dk> wrote in message <hv9ri9$ej$1(a)fred.mathworks.com>...
> > > Let's say that there is a 5x5 array, A:
> > >
> > > A=magic(5)
> > >
> > > A =
> > >
> > > 17 24 1 8 15
> > > 23 5 7 14 16
> > > 4 6 13 20 22
> > > 10 12 19 21 3
> > > 11 18 25 2 9
> > >
> > > What function will find the row and column number for the element with value 6?
> > >
> > > I am sorry for this simple question, but I simply cannot find it :(
> >
> > You cannot FIND the function that can FIND row and column? Did you try "FIND"?
> >
> > Bruno
>
> I might not be the best ML programmer, but could you help me a bit further?
>
> [row,col]=find(A)
>
> returns the indices of nonzero elements. How do I get - for instance - the row and column number for the element with value 6 using find?
>
> /peter

You need to convert the input to FIND into an logical array:

A = magic(3)
B = A == 6
[r,c] = find(B) % % in 1 step: [r,c] = find(A==6)

Jos
From: Bruno Luong on 16 Jun 2010 05:37
To find elements equal to 6, use

[row,col]=find(A==6)

And don't forget to read "Getting Started" document.

Bruno
 |  Next  |  Last
Pages: 1 2
Prev: 30 Days Free Trial Project Management Software
Next: How to generate a random strongly connected graph??