Remove rows duplicates based on a condition

I have an array with 717136 rows and 5 columns. I need to exclude the rows where the value of the first column is the same, but with one condition: leave only the row where the value of column 5 is greater. My matrix looks like this:

12178	-5,22911	-37,2923	20,5000	3000
12672	-5,17523	-37,2833	21,5000	3000
12178	-5,22911	-37,2923	20,5000	4000
12672	-5,17523	-37,2833	21,5000	4000
12673	-5,18421	-37,2833	21,8799	4000
12674	-5,19319	-37,2833	22,3799	4000
12675	-5,20217	-37,2833	21,1299	4000
12679	-5,23809	-37,2833	20,5000	4000
12673	-5,18421	-37,2833	21,8799	5000
12674	-5,19319	-37,2833	22,3799	5000
12675	-5,20217	-37,2833	21,1299	5000
12679	-5,23809	-37,2833	20,5000	5000

And I want result this:

12178	-5,22911	-37,2923	20,5000	4000
12672	-5,17523	-37,2833	21,5000	4000
12673	-5,18421	-37,2833	21,8799	5000
12674	-5,19319	-37,2833	22,3799	5000
12675	-5,20217	-37,2833	21,1299	5000
12679	-5,23809	-37,2833	20,5000	5000

In other words, the conditions are: if you have more than one row with the same number (eg 12178) in the first column, keep only the row in which the value in the last column is greater. In the case of the example I gave, just keep:

12178	-5,22911	-37,2923	20,5000	4000
12672	-5,17523	-37,2833	21,5000	4000
12673	-5,18421	-37,2833	21,8799	5000
12674	-5,19319	-37,2833	22,3799	5000
12675	-5,20217	-37,2833	21,1299	5000
12679	-5,23809	-37,2833	20,5000	5000

Answer 1

[Sean de Wolski]

MWE- use the 'stable' flag to unique if you care about order:

x = [172 2 1;
     134 3 2;
     172 4 0.4];
 
[uv,~,idx] = unique(x(:,1));
mx = accumarray(idx,(1:numel(idx))',[],@(v)v(maxind(x(v, end))));
x(mx,:)

function mx = maxind(x)
[~, mx] = max(x);
end

ans =

134 3 2

172 2 1

[pink flower]

I tried these commands but got this error:

Undefined function or variable 'maxind'.

Error in @(v)v(maxind(x(v,end)))

Answer 2

[Bruno Luong]

A=[ ...
12178	-5.22911	-37.2923	20.5000	3000;
12672	-5.17523	-37.2833	21.5000	3000;
12178	-5.22911	-37.2923	20.5000	4000;
12672	-5.17523	-37.2833	21.5000	4000;
12673	-5.18421	-37.2833	21.8799	4000;
12674	-5.19319	-37.2833	22.3799	4000;
12675	-5.20217	-37.2833	21.1299	4000;
12679	-5.23809	-37.2833	20.5000	4000;
12673	-5.18421	-37.2833	21.8799	5000;
12674	-5.19319	-37.2833	22.3799	5000;
12675	-5.20217	-37.2833	21.1299	5000;
12679	-5.23809	-37.2833	20.5000	5000]

B=sortrows(A,[1 5]);
B=B([diff(B(:,1))~=0; true],:)

[pink flower]

I managed using only the second line! If I want to use the second and third lines as a criterion, is it possible?

Thanks!