Data Analysis with uneven data lenghts

Hi

I have two sets of data that are different lenghts which has caused a problem where the shorter set of data has now presumed that the rest of the data is all 0 so the graph has a sharp line that shouldn't be there. Is there a way of stopping this problem?

Data1 = csvread('Swale5km.csv')
Data1(:,1), Data1(:,2), Data1(:,3), Data1(:,4)
plot(Data1(:,1), Data1(:,2),Data1(:,3), Data1(:,4))
xlabel 'Time/Hours'
ylabel ' Concentration ug/l'

[Peter Perkins]

Data1(:,1), Data1(:,2), Data1(:,3), Data1(:,4) as written above certainly are not different lengths.

If you have x1, y1 different lengths than x2, y2, plot(x1,y1,x2,y2) will work just fine.

Answer 1

[dpb]

Substitute NaN for the missing values; plot() will silently ignore it.

Since it appears there are no real zero values, you can do it trivially in this case:

Data1(Data1==0)=nan;

[Matthew Gilroy]

Cheers that was really helpful