How do I get the position of the highest numbers of a vector?

Hi everyone,

Does anyone know how to get the position of 4 highest numbers of a vector? For example,

rng(1)
a = randn(10,1)

a =

   -0.6490
    1.1812
   -0.7585
   -1.1096
   -0.8456
   -0.5727
   -0.5587
    0.1784
   -0.1969
    0.5864

Clearly the four highest numbers are 1.1812 , 0.5864 , 0.1784 and -0.1969. That correspond to element 2,10,8 and 9, respectively. How can I get this sequence in a vector form, ie 4x1?

Thanks a lot.

Answer 1

[dpb]

>> [mx,ix]=sort(a,'descend');
>> N=4;
>> num2str([ix(1:N) mx(1:N) ],'Posn %2d Value %7.4f')
ans =
Posn  2 Value  1.1812
Posn 10 Value  0.5864
Posn  8 Value  0.1784
Posn  9 Value -0.1969
>>

[gsourop]

thanks a lot!!