How to change size of graph

I want to resize for the highest dot from Y coordinate (5 x 10*4) to 100

pure_brain = readmatrix('Pure Brain Spectra.csv');
[pks,locs] = findpeaks(pure_brain(:,2));  
x = 1:size(pure_brain,1);
[pks_min,pks_max] = bounds(pks)                                         % Minimum & Maximum Values Of ‘pks’
figure
Lv = pure_brain(locs,2)>1E+4;                                           % Set Threshold = 1E+4
% Lv = pure_brain(locs,2)>1;                                              % Set Threshold = 1
plot(x(locs(Lv)), pure_brain(locs(Lv),2), '.r')
grid
title('Pure brain peak');


AB=unique(pks);
YB1=AB(end);                   %1Y
YB2=AB(end-1);                 %2Y
YB3=AB(end-2);                 %3Y

EB1=find(pks==YB1);
XB1=locs(EB1);

EB2=find(pks==YB2);
XB2=locs(EB2);

EB3=find(pks==YB3);
XB3=locs(EB3);



SYB = [ YB1 YB2 YB3 ];
SXB = [ XB1 XB2 XB3 ];

Answer 1

[Star Strider]

If the objective is to re-scale all the values so that the highest is 100, then:

Y = (Y-min(Y,0)) * 100/max(Y);

would likely work.

[Phudit Kanittasut]

Where should I replace in my code , sorry toask but I am newbie here

[Star Strider]

I would do something like this:

Y = pure_brain(locs(Lv),2);
Y = Y .* 100/max(Y);

Then, assuming all the ‘Y’ values are , the plot becomes:

plot(x(locs(Lv)), Y, '.r')

If I understand correctly what you want to do, that should work.

[Phudit Kanittasut]

Thank you so much

[Star Strider]

As always, my pleasure!