Find the highest value of y for each x value

Can anyone please help me with this quesiton. I have a big matrix where I’m only interested to plot the highest value of y for each x value. My x-axis ranges between 0 and 45 and I want the highest values for each one. So, I created the following code but I’m not happy with it. I also attached my data. Thank you for your time.

x       = MaT_All(:,18);
y       = MaT_All(:,17)

edges   = 200; % I used a number as 200 since I could not find the indexs of 0:45 in the original data (x) 

Group   = discretizediscretize(x ,edges); %

Result_y  = accumarray(Group, y , [], @max); % I got the highest values (y) but not sure how to find the corresponding  value in x 

scatter(Result_x ,Result_y) % how can i find Result_x 

I also tried this code

[G,TID] = findgroups(x);
Max_NPV = splitapply(@max,y),G);
scatter(TID,Max_NPV);

[Cedric]

What do you mean by "not happy with it"?

Answer 1

[Image Analyst]

How about (untested):

ux = unique(x)
hold on;
for k = 1 : length(ux) % For each unique x...
    % Find the max y for this x value.
    maxY = max(y == ux(k));
    % Plot that point.
    plot(ux(k), maxY, 'b.', 'MarkerSize', 10);
end
grid on;

[Yaser Khojah]

thanks fo your help but that does not give me what i'm looking for. I have this code but i still do not know how to find the index of the ymax?

x          = round(MaT_All(:,18),0);
y          = MaT_All(:,17);
[uv,~,idx] = unique(x);
ymax       = accumarray(idx,y,[],@max); %build matrix
[uv ymax];


figure
scatter(uv,ymax)
line(uv,ymax)