How do I make gaps in missing data plot lines?

2019 10 7
3 个回答
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更新时间：2019 10 10
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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

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Star Strider
Star Strider 2019-10-7

0 个投票

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.

更多回答（2 个）

Daniel M
Daniel M 2019-10-7

0 个投票

help plot
You are the one telling Matlab to plot a line between your data points. Try
plot(x,y,'c.')

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Miriam Daughtery
Miriam Daughtery 2019-10-7
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

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