Figure line won't connect/display all data points

For some reason matlab won't plot all my data points. when i hover over the last part (18-19km) it says there should be data points but there is no line connecting them or even points showing them. I have tried changing the renderer from painter to zbuffer or opengl (like was recommended on this forum) but neither seems to work.

%% plot Q vs distance 
figure
set(gcf,'renderer','zbuffer')
plot(midpoint,Q)
title('Mean Q after bootstrapping')
grid on
xticks(0:1.5:19.5) %proxy
xlim([0 19.5]) %proxy
xlabel('Midpoint distance [km]')
ylabel('Q')

[Mathieu NOE]

hello

there is no line plotted in this area because there are only single (valid) values between NaNs , so this cannot generate a continuous line plot; you need two contiguous non-Nan values to have a line segment

I changed your plot command to

plot(midpoint_overlap_seq_sort,Qv_seq_sort,'-*')

and now you will see all your data - zoom in the last part of the plot :

the "isolated" data will appear as a dot , the contiguous non-Nan values will appear as line segments

[Gino Battistella]

I didn't know about the effects of NaN values on plotting, so thanks a lot!

Answer 1

[Star Strider]

Isolated points only plot if specified as markers.

Try this:

D1 = load('midpoint.mat');
midpoint = D1.midpoint_overlap_seq_sort;
D2 = load('Q.mat');
Q = D2.Qv_seq_sort;

Lv = ~isnan(Q);                                                 % Vector Of Non-‘NaN’ Values
disc_pts = strfind(Lv.', [0 1 0])+1;                            % Locations Of Isolated Non-‘NaN’ Values

figure
plot(midpoint, Q)                                               % Continuous Data
hold on
plot(midpoint(disc_pts), Q(disc_pts), '.r')                     % Isolated Points
hold off
grid
legend('Continuous Data', 'Isolated Points', 'Location','NW')

producing:

.

[Gino Battistella]

Thanks a bunch, this is very helpfull aswell! I don't really know how it works with accepting answers since this was my first time asking something here and Matthieu also provided a helpfull answer but in the comments.

[Mathieu NOE]

yep - no problem if I lost one opportunity to win an answer ! Star Strider managed it better than me ...

i am not in a beauty contest here ....

[Star Strider]

Gino Battistella — As always, my pleasure!

Mathieu NOE — Thank you.