plot points greater than a value

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DUMITRU ROBERT GUGIU
评论： DUMITRU ROBERT GUGIU 2021-1-2
clear all; clc;
%% parte dedicata a lettura dati
ncfile='T32TQM_20150704_20181230_S2_L3A_10m_TSM_CTWORCC_clip.nc';
ncinfo(ncfile);
ncdisp(ncfile);
x=ncread(ncfile,'x');
y=ncread(ncfile,'y');
% import time dimension
% convert date from days since 1970-01-01 to Matlab datetime
time= ncread(ncfile,'time');
date_matlab = datetime(time, 'convertfrom','posixtime');
figure
for t=131
startLoc = [1 1 t];
count = [Inf Inf 1];
d = ncread(ncfile,'TSM',startLoc,count);
d=d';
vmax(t)=max(max(d));
vmax= vmax'
B = rmmissing(d);
vmed=mean(mean(B));
[max_val,pos_idx]=max(d(:));
[rigas,clonax]=ind2sub(size(d),pos_idx);
[riga,colonna]=ind2sub(size(d),pos_idx);
vall=max(d(:))-10;
vall2=max(d(:))-15;
max=vall;
for i=1:length(d)
if max<vall && max>vall2
max=vall
end
end
% rob=log10(d);
[max_val2,pos_idx2]=find(d==max);
[rigas2,clonax2]=ind2sub(size(d),pos_idx2)
clf
mymap=pcolor(x,y,d);
mymap.EdgeAlpha=0
hold on
load coast
xx=x(riga)
yy=y(colonna)
xxx=x(4360);
yyy=y(3438);
xxxx=x(rigas2);
yyyy=y(clonax2);
plot(long,lat+0.1,'black')
scatter(xxx,yyy,'filled')
scatter(xxxx,yyyy,'filled')
scatter(xx,yy,'filled')
%contourf(x,y,d,7,'ShowText','on')
set(gca,'ColorScale','log')
caxis([1 10])
sr=colorbar
sr.Label.String = 'g/m^3';
xlabel('m');
ylabel('m')
caption = sprintf('%s','tsm [g/m3]' , date_matlab(t),'[UTC]',' V MAX_ ', vmax(t), ' v med_ ', vmed);
caption1 = sprintf('%s', date_matlab(t));
title(caption, 'FontSize', 10, 'FontWeight', 'bold', 'Color', 'b');
pause(2)
print(['TSM_01s' datestr(date_matlab(t),'ddmmyyyy') '.png'],'-dpng');
xx
yy;
foce=d(4360,3438);
PTOMAX=d(riga,colonna);
dist=(((xx-xxx)^2+(yy-yyy)^2)^(1/2))/1000
end
%%%%%%%%%%%%%QUESTION%%%%%%%%%%
Hi all, I have find the maximum value and plotted it as a point with SCATTER.
I would like to find all the points> 130 containing in the matrix d, find their x and y coordinates and plot them all together.
  1 个评论
Walter Roberson
Walter Roberson 2020-12-31
max=vall;
Don't do that! As soon as you do that, you cannot use max() as a function, which is something you do call upon!

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采纳的回答

Walter Roberson
Walter Roberson 2020-12-31
mask = d > 130;
selected_d = d(mask);
selected_x = x(mask);
selected_y = y(mask);
pointsize = 20;
scatter(selected_x, selected_y, pointsize, selected_d); %color by d value
  8 个评论
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DUMITRU ROBERT GUGIU
DUMITRU ROBERT GUGIU 2021-1-2
my code:
clear all; clc;
%% parte dedicata a lettura dati
ncfile='T32TQM_20150704_20181230_S2_L3A_10m_TSM_CTWORCC_clip.nc';
ncinfo(ncfile);
ncdisp(ncfile);
x=ncread(ncfile,'x');
y=ncread(ncfile,'y');
time= ncread(ncfile,'time');
date_matlab = datetime(time, 'convertfrom','posixtime');
figure
for t=233
startLoc = [1 1 t];
count = [Inf Inf 1];
d = ncread(ncfile,'TSM',startLoc,count);
d=d';
vmax(t)=max(max(d));
vmax= vmax'
B = rmmissing(d);
vmed=mean(mean(B));
[max_val,pos_idx]=max(d(:));
[riga,colonna]=ind2sub(size(d),pos_idx);
vall=max(d(:))-0.2;
vall2=max(d(:))-0.15;
max=vall;
% nanMask = isnan(d);
% imshow(nanMask);
% mask = d > 2;
% mask(nanMask) = false;
% figure
% imshow(mask, []);
clf
mymap=pcolor(x,y,d);
mymap.EdgeAlpha=0
hold on
load coast
xx=x(riga)
yy=y(colonna)
xxx=x(4360);
yyy=y(3438);
plot(long,lat+0.1,'black')
scatter(xxx,yyy,'filled')
% scatter(xxxx,yyyy,'filled')
scatter(xx,yy,'filled')
%contourf(x,y,d,7,'ShowText','on')
set(gca,'ColorScale','log')
caxis([1 5])
sr=colorbar
sr.Label.String = 'g/m^3';
xlabel('m');
ylabel('m')
caption = sprintf('%s','tsm [g/m3]' , date_matlab(t),'[UTC]',' V MAX_ ', vmax(t), ' v med_ ', vmed);
caption1 = sprintf('%s', date_matlab(t));
title(caption, 'FontSize', 10, 'FontWeight', 'bold', 'Color', 'b');
pause(2)
%print(['TSM_01s' datestr(date_matlab(t),'ddmmyyyy') '.png'],'-dpng');
% % % % %print(['imm_satellit_01S ' num2str(time(t)) '.png'],'-dpng');
xx
yy;
foce=d(4360,3438);
PTOMAX=d(riga,colonna);
dist=(((xx-xxx)^2+(yy-yyy)^2)^(1/2))/1000
end

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