Thread Subject: Sorting matrix in Ascending Order

Hi,
I am trying to sort out two large matrix x & y. The values
are scattered. I am trying to sort out the matrix 'x' in
ascending order and also want to change the y cells
according to the corresponding 'y' cells. I have used the
sort function but dont know how to track which cells have
been changed.
 

Below Is part of the matrix

x=[11.3867
   11.4481
   11.7062
   11.7676
   12.0256
   12.0912
   12.3451
   12.4106
   12.6646
   12.7301
   12.9226
   12.9881
   13.0496
   13.2421
   13.3076
   13.3690
   13.5616
   13.6271
   11.3867
   11.4481
   11.7062
   11.7676
   12.0256
   12.0912
   12.3451
   12.4106
   12.6646
   12.7301
   12.9226
   12.9881]
y=[0.3175
0.3375
0.4675
0.5075
0.7125
0.7575
1.0075
1.0175
1.0625
1.0825
1.0975
1.0875
1.0675
0.9875
0.9725
0.9375
0.7775
0.7625
0.3175
0.3375
0.4675
0.5075
0.7125
0.7575
1.0075
1.0175
1.0625
1.0825
1.0975
1.0875]

Thanks

"Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
news:g4fvp1$os4$1@fred.mathworks.com...
> Hi,
> I am trying to sort out two large matrix x & y. The values
> are scattered. I am trying to sort out the matrix 'x' in
> ascending order and also want to change the y cells
> according to the corresponding 'y' cells. I have used the
> sort function but dont know how to track which cells have
> been changed.

*snip*

You're using the 1-output syntax for SORT. There's another syntax listed in
the help that you can use for SORT -- do you see how you can use the
information you obtain from that syntax to solve your question?

--
Steve Lord
slord@mathworks.com

"Steven Lord" <slord@mathworks.com> wrote in message <g4g023
$t79$1@fred.mathworks.com>...
>
> "Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
> news:g4fvp1$os4$1@fred.mathworks.com...
> > Hi,
> > I am trying to sort out two large matrix x & y. The
values
> > are scattered. I am trying to sort out the matrix 'x'
in
> > ascending order and also want to change the y cells
> > according to the corresponding 'y' cells. I have used
the
> > sort function but dont know how to track which cells
have
> > been changed.
>
> *snip*
>
> You're using the 1-output syntax for SORT. There's
another syntax listed in
> the help that you can use for SORT -- do you see how you
can use the
> information you obtain from that syntax to solve your
question?
>
> --
> Steve Lord
> slord@mathworks.com
>

I dont understand what your refering to. Could you be a
bit more specific about it. I can sort the matrix, but
need some help on changing matrix 'y' accordingly.
Thanks

"Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
<g4fvp1$os4$1@fred.mathworks.com>...
> Hi,
> I am trying to sort out two large matrix x & y. The
values
> are scattered. I am trying to sort out the matrix 'x' in
> ascending order and also want to change the y cells
> according to the corresponding 'y' cells. I have used
the
> sort function but dont know how to track which cells have
> been changed.
>
>
> Below Is part of the matrix
>
> x=[11.3867
> 11.4481
> 11.7062
> 11.7676
> 12.0256
> 12.0912
> 12.3451
> 12.4106
> 12.6646
> 12.7301
> 12.9226
> 12.9881
> 13.0496
> 13.2421
> 13.3076
> 13.3690
> 13.5616
> 13.6271
> 11.3867
> 11.4481
> 11.7062
> 11.7676
> 12.0256
> 12.0912
> 12.3451
> 12.4106
> 12.6646
> 12.7301
> 12.9226
> 12.9881]
> y=[0.3175
> 0.3375
> 0.4675
> 0.5075
> 0.7125
> 0.7575
> 1.0075
> 1.0175
> 1.0625
> 1.0825
> 1.0975
> 1.0875
> 1.0675
> 0.9875
> 0.9725
> 0.9375
> 0.7775
> 0.7625
> 0.3175
> 0.3375
> 0.4675
> 0.5075
> 0.7125
> 0.7575
> 1.0075
> 1.0175
> 1.0625
> 1.0825
> 1.0975
> 1.0875]
>
> Thanks
> use the following:
z=[x;y];
zz=sortrows(z,1) % if you are sorting by x or
sortrows(z,2) %jf you are sorting by y
x=zz(:,1);
y=zz(:,2);

"Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
<g4fvp1$os4$1@fred.mathworks.com>...
> Hi,
> I am trying to sort out two large matrix x & y. The
values
> are scattered. I am trying to sort out the matrix 'x' in
> ascending order and also want to change the y cells
> according to the corresponding 'y' cells. I have used
the
> sort function but dont know how to track which cells have
> been changed.
>
>
> Below Is part of the matrix
>
> x=[11.3867
> 11.4481
> 11.7062
> 11.7676
> 12.0256
> 12.0912
> 12.3451
> 12.4106
> 12.6646
> 12.7301
> 12.9226
> 12.9881
> 13.0496
> 13.2421
> 13.3076
> 13.3690
> 13.5616
> 13.6271
> 11.3867
> 11.4481
> 11.7062
> 11.7676
> 12.0256
> 12.0912
> 12.3451
> 12.4106
> 12.6646
> 12.7301
> 12.9226
> 12.9881]
> y=[0.3175
> 0.3375
> 0.4675
> 0.5075
> 0.7125
> 0.7575
> 1.0075
> 1.0175
> 1.0625
> 1.0825
> 1.0975
> 1.0875
> 1.0675
> 0.9875
> 0.9725
> 0.9375
> 0.7775
> 0.7625
> 0.3175
> 0.3375
> 0.4675
> 0.5075
> 0.7125
> 0.7575
> 1.0075
> 1.0175
> 1.0625
> 1.0825
> 1.0975
> 1.0875]
>
> Thanks
> use the following:
z=[x;y];
zz=sortrows(z,1) % if you are sorting by x or
sortrows(z,2) %jf you are sorting by y
x=zz(:,1);
y=zz(:,2);
 Aasim Azooz

"Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
<g4g0qp$91j$1@fred.mathworks.com>...
> "Steven Lord" <slord@mathworks.com> wrote in message <g4g023
> $t79$1@fred.mathworks.com>...
> >
> > "Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
> > news:g4fvp1$os4$1@fred.mathworks.com...
> > > Hi,
> > > I am trying to sort out two large matrix x & y. The
> values
> > > are scattered. I am trying to sort out the matrix 'x'
> in
> > > ascending order and also want to change the y cells
> > > according to the corresponding 'y' cells. I have used
> the
> > > sort function but dont know how to track which cells
> have
> > > been changed.
> >
> > *snip*
> >
> > You're using the 1-output syntax for SORT. There's
> another syntax listed in
> > the help that you can use for SORT -- do you see how you
> can use the
> > information you obtain from that syntax to solve your
> question?
> >
> > --
> > Steve Lord
> > slord@mathworks.com
> >
>
> I dont understand what your refering to. Could you be a
> bit more specific about it. I can sort the matrix, but
> need some help on changing matrix 'y' accordingly.
> Thanks
>

Steve Lord is refering to the following.

[sortedX, IND] = sort(X) ;

Try to figure out what the numbers of IND mean. Read
carefully through the help of sort! What happens if you
apply them to another array?

Jos

"Jos " <DELjos@jasenDEL.nl> wrote in message
<g4g25u$rrt$1@fred.mathworks.com>...
> "Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
> <g4g0qp$91j$1@fred.mathworks.com>...
> > "Steven Lord" <slord@mathworks.com> wrote in message
<g4g023
> > $t79$1@fred.mathworks.com>...
> > >
> > > "Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
> > > news:g4fvp1$os4$1@fred.mathworks.com...
> > > > Hi,
> > > > I am trying to sort out two large matrix x & y.
The
> > values
> > > > are scattered. I am trying to sort out the
matrix 'x'
> > in
> > > > ascending order and also want to change the y cells
> > > > according to the corresponding 'y' cells. I have
used
> > the
> > > > sort function but dont know how to track which
cells
> > have
> > > > been changed.
> > >
> > > *snip*
> > >
> > > You're using the 1-output syntax for SORT. There's
> > another syntax listed in
> > > the help that you can use for SORT -- do you see how
you
> > can use the
> > > information you obtain from that syntax to solve your
> > question?
> > >
> > > --
> > > Steve Lord
> > > slord@mathworks.com
> > >
> >
> > I dont understand what your refering to. Could you be
a
> > bit more specific about it. I can sort the matrix,
but
> > need some help on changing matrix 'y' accordingly.
> > Thanks
> >
>
> Steve Lord is refering to the following.
>
> [sortedX, IND] = sort(X) ;
>
> Try to figure out what the numbers of IND mean. Read
> carefully through the help of sort! What happens if you
> apply them to another array?
>
> Jos

Thanks for the help. But the above code joins both matrix
and sorts them in ascending order.

I need to keep both x and y seperate and sort x in
ascending order and the cells that have been changed I want
to rearrange the cells accordingly.
Thanks

"Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
<g4g3mm$imj$1@fred.mathworks.com>...
> "Jos " <DELjos@jasenDEL.nl> wrote in message
> <g4g25u$rrt$1@fred.mathworks.com>...
> > "Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
> > <g4g0qp$91j$1@fred.mathworks.com>...
> > > "Steven Lord" <slord@mathworks.com> wrote in message
> <g4g023
> > > $t79$1@fred.mathworks.com>...
> > > >
> > > > "Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
> > > > news:g4fvp1$os4$1@fred.mathworks.com...
> > > > > Hi,
> > > > > I am trying to sort out two large matrix x & y.
> The
> > > values
> > > > > are scattered. I am trying to sort out the
> matrix 'x'
> > > in
> > > > > ascending order and also want to change the y cells
> > > > > according to the corresponding 'y' cells. I have
> used
> > > the
> > > > > sort function but dont know how to track which
> cells
> > > have
> > > > > been changed.
> > > >
> > > > *snip*
> > > >
> > > > You're using the 1-output syntax for SORT. There's
> > > another syntax listed in
> > > > the help that you can use for SORT -- do you see how
> you
> > > can use the
> > > > information you obtain from that syntax to solve your
> > > question?
> > > >
> > > > --
> > > > Steve Lord
> > > > slord@mathworks.com
> > > >
> > >
> > > I dont understand what your refering to. Could you be
> a
> > > bit more specific about it. I can sort the matrix,
> but
> > > need some help on changing matrix 'y' accordingly.
> > > Thanks
> > >
> >
> > Steve Lord is refering to the following.
> >
> > [sortedX, IND] = sort(X) ;
> >
> > Try to figure out what the numbers of IND mean. Read
> > carefully through the help of sort! What happens if you
> > apply them to another array?
> >
> > Jos
>
> Thanks for the help. But the above code joins both matrix
> and sorts them in ascending order.
>
> I need to keep both x and y seperate and sort x in
> ascending order and the cells that have been changed I want
> to rearrange the cells accordingly.
> Thanks


??? sort(X) does not join x and y ...

OK, I think someone has to spell it out for you:

  [sx,i] = sort(x)
  y = y(i)

Jos

"Jos " <DELjos@jasenDEL.nl> wrote in message
<g4g4gt$spn$1@fred.mathworks.com>...
> "Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
> <g4g3mm$imj$1@fred.mathworks.com>...
> > "Jos " <DELjos@jasenDEL.nl> wrote in message
> > <g4g25u$rrt$1@fred.mathworks.com>...
> > > "Ali Hussain" <hussaizj@aston.ac.uk> wrote in message
> > > <g4g0qp$91j$1@fred.mathworks.com>...
> > > > "Steven Lord" <slord@mathworks.com> wrote in
message
> > <g4g023
> > > > $t79$1@fred.mathworks.com>...
> > > > >
> > > > > "Ali Hussain" <hussaizj@aston.ac.uk> wrote in
message
> > > > > news:g4fvp1$os4$1@fred.mathworks.com...
> > > > > > Hi,
> > > > > > I am trying to sort out two large matrix x &
y.
> > The
> > > > values
> > > > > > are scattered. I am trying to sort out the
> > matrix 'x'
> > > > in
> > > > > > ascending order and also want to change the y
cells
> > > > > > according to the corresponding 'y' cells. I
have
> > used
> > > > the
> > > > > > sort function but dont know how to track which
> > cells
> > > > have
> > > > > > been changed.
> > > > >
> > > > > *snip*
> > > > >
> > > > > You're using the 1-output syntax for SORT.
There's
> > > > another syntax listed in
> > > > > the help that you can use for SORT -- do you see
how
> > you
> > > > can use the
> > > > > information you obtain from that syntax to solve
your
> > > > question?
> > > > >
> > > > > --
> > > > > Steve Lord
> > > > > slord@mathworks.com
> > > > >
> > > >
> > > > I dont understand what your refering to. Could you
be
> > a
> > > > bit more specific about it. I can sort the
matrix,
> > but
> > > > need some help on changing matrix 'y' accordingly.
> > > > Thanks
> > > >
> > >
> > > Steve Lord is refering to the following.
> > >
> > > [sortedX, IND] = sort(X) ;
> > >
> > > Try to figure out what the numbers of IND mean. Read
> > > carefully through the help of sort! What happens if
you
> > > apply them to another array?
> > >
> > > Jos
> >
> > Thanks for the help. But the above code joins both
matrix
> > and sorts them in ascending order.
> >
> > I need to keep both x and y seperate and sort x in
> > ascending order and the cells that have been changed I
want
> > to rearrange the cells accordingly.
> > Thanks
>
>
> ??? sort(X) does not join x and y ...
>
> OK, I think someone has to spell it out for you:
>
> [sx,i] = sort(x)
> y = y(i)
>
> Jos
>
Sorry Jos. I was talking about the code that was given by
Assim. I have managed to to do it and now just realised
you put the same code on here. Cheers Jos