How to select an maximum value from this matrix?

i have an matrix like this

 a=[   1.7923  179.1685    0.9985
   38.6896  186.7030    1.0000
   27.9668  191.8023    0.9988
   15.1071  188.5679    0.9986
   15.3087  173.0626    1.0000];

from this, i need to choose an higher value particularly in 3rd column according to that i want to choose the corespondent row value, like this

example:

b=[38.6896  186.7030    1.0000
   15.3087  173.0626    1.0000]

like this i want to get output

Answer 1

[Star Strider]

This works:

b = a(a(:,3)>=1-1E-8,:)

producing:

b =

      38.6896e+000   186.7030e+000     1.0000e+000
      15.3087e+000   173.0626e+000     1.0000e+000

The inequality test is to allow for floating-point approximation error.

[Matlab111]

if this is like this i'm not getting the correct value it's showing "Empty matrix: 0-by-3"

 a=[179.4877   16.9538    0.9989
  199.7141    5.5321    0.9979
  187.1564    3.3891    0.9983]

i need to get like this

 b=[179.4877   16.9538    0.9989];

[Star Strider]

I’m not quite sure what you want, but if you want the rows with the highest values in ‘a(:,3)’, this will work:

b = a(a(:,3)>=max(a(:,3))-1E-8,:)

Adjust the tolerance on the inequality (here -1E-8) to get the range you want. (The value I chose allows for floating point approximation imprecision.)

[Matlab111]

K thank you.

[Star Strider]

My pleasure!