Thread Subject: Range in Matlab

Hi everyone,

I need to find the min and max value in a subset of an array

normally, if I have a 2D array called x, I can do

min(min(x)) and this works fine...

However, if this array is 128 X 128, I just want the minimum between
the indexes [5, 5,] and [123, 123]... How can I specify this?

Thanks,
D

"deluded.soul@gmail.com" <deluded.soul@gmail.com> wrote in
message <0385fb35-5bb5-4de5-9034-
b2ac109e3308@l32g2000hse.googlegroups.com>...
> Hi everyone,
>
> I need to find the min and max value in a subset of an
array
>
> normally, if I have a 2D array called x, I can do
>
> min(min(x)) and this works fine...
>
> However, if this array is 128 X 128, I just want the
minimum between
> the indexes [5, 5,] and [123, 123]... How can I specify
this?
>
> Thanks,
> D

rowind = [5 123];
colind = [5 123];
m = min(x(sub2ind(size(x),rowind,colind)))

HTH

Anh Huy Phan
RIKEN - BSI

In article <0385fb35-5bb5-4de5-9034-b2ac109e3308@l32g2000hse.googlegroups.com>,
deluded.soul@gmail.com <deluded.soul@gmail.com> wrote:
>However, if this array is 128 X 128, I just want the minimum between
>the indexes [5, 5,] and [123, 123]... How can I specify this?

min(min(thearray(5:123,5:123)))
--
  "There are some ideas so wrong that only a very intelligent person
  could believe in them." -- George Orwell

Hi,

you can do:
index_range=[5:123];
solution = min(min(x(indices,indices)));

Cheers,
Nicolas

On Sat, 19 Jan 2008, deluded.soul@gmail.com wrote:

> Hi everyone,
>
> I need to find the min and max value in a subset of an array
>
> normally, if I have a 2D array called x, I can do
>
> min(min(x)) and this works fine...
>
> However, if this array is 128 X 128, I just want the minimum between
> the indexes [5, 5,] and [123, 123]... How can I specify this?
>
> Thanks,
> D
>

Typo:
indices=index_range;

On Sun, 20 Jan 2008, Nicolas Jeannequin wrote:

> Hi,
>
> you can do:
> index_range=[5:123];
> solution = min(min(x(indices,indices)));
>
> Cheers,
> Nicolas
>
> On Sat, 19 Jan 2008, deluded.soul@gmail.com wrote:
>
>> Hi everyone,
>>
>> I need to find the min and max value in a subset of an array
>>
>> normally, if I have a 2D array called x, I can do
>>
>> min(min(x)) and this works fine...
>>
>> However, if this array is 128 X 128, I just want the minimum between
>> the indexes [5, 5,] and [123, 123]... How can I specify this?
>>
>> Thanks,
>> D
>>
>