How do I make gaps in missing data plot lines?

I'm relatively new to matlab, so I don't know if this is an easy question to answer.

How do I make gaps in my plot line where data is missing? Thank you

Answer 1

[Star Strider]

It would be easier with your data.

One option is to fill the missing entries with NaN values:

x = [1:10  15:20];                                      % Create Vector (11:14 Missing)
y = [rand(1,10)  rand(1,6)];                            % Create Vector (11:14 Missing)

figure
plot(x, y)
grid

dx = (diff([0 x]));                                     % Differences Between Coinsecutive Elements
xnan = nan(1, dx(dx > 1)-1);                            % ‘NaN’ Vector (Fill Missing Elements)
dxi = find(dx > 1);                                     % First Index Of Missing Elements
xc = [x(1:dxi-1) xnan x(dxi:dxi+numel(xnan)+1)];        % Replace Missing Elements With ‘xnan’ Vector
yc = [y(1:dxi-1) xnan y(dxi:dxi+numel(xnan)+1)];        % Replace Missing Elements With ‘xnan’ Vector

figure
plot(xc, yc)
grid

Experiment with your data to get the result you want.

Answer 2

[Daniel M]

help plot

You are the one telling Matlab to plot a line between your data points. Try

plot(x,y,'c.')

[Miriam Daughtery]

I want to keep the line but just leave a gap between the points where data us missing

this is my script:

d = dir('*.txt');

t = [];

T = [];

S = [];

O = [];

for I= 1 : length(d)

[tmpt,tmpT,tmpS,tmpO]=process_datafile(d(I).name);

t = [t tmpt];

T = [T tmpT];

S = [S tmpS];

O = [O tmpO];

end

subplot(3,1,1)

plot(t,T, '.k-', 'MarkerEdgeColor','r', 'MarkerFaceColor','r', 'MarkerSize',9)

x=-100:0.5:100;

y=x.^5-x.^2;

xlabel ('Day Of Year')

ylabel ('SST (^oC)')

grid on

legend('2013','2012')

hold on

title ('L4 daily mean sea surface temperature, salinity and O_2 levels 2012-2013')

subplot(3,1,2)

plot(t,S, '.k-', 'MarkerEdgeColor','r', 'MarkerFaceColor','r', 'MarkerSize',9)

xlabel ('Day Of Year')

ylabel ('Salinity (ppt)')

grid on

legend('2013','2012')

hold on

subplot(3,1,3)

plot(t,O, '.k-', 'MarkerEdgeColor','r', 'MarkerFaceColor','r', 'MarkerSize',9);

xlabel ('Day Of Year')

ylabel ('O_2 levels (%)')

grid on

legend('2013','2012')

hold on

Answer 3

[Miriam Daughtery]

Thanks everyone