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Plot is plotting very weird lines between points... Very confused!

Asked by mashtine on 12 May 2014
Latest activity Commented on by mashtine on 12 May 2014
Hey everyone,
I attached the image and cell array and below is the code I use. When I use matlabs PLOTS tab and select the data it plots normally but I am not sure what is going on here. I do not have any INF or NaN values in the data:
inpdata = Turbineoutput_0813;
inpdata(cellfun(@(x) isnan(x), inpdata(:,7)),:)=[];
date = datenum(inpdata(:,1),'mm/dd/yyyy');
turb1out = cell2mat(inpdata(:,3));
turb2out = cell2mat(inpdata(:,4));
turb3out = cell2mat(inpdata(:,5));
turb4out = cell2mat(inpdata(:,6));
turb5out = cell2mat(inpdata(:,7));
figure;
plot(date,turb1out,'-k');
hold on
plot(date,turb2out,'--r');
hold on
plot(date,turb3out,'--b')
hold on
plot(date,turb4out,'--g');
hold on
plot(date,turb5out,'--c');
datetick('x','mm/yyyy','keeplimits');
ylabel('Daily turbine power output (kWh)');
I have made the code more detailed as I want to figure this out first and cannot find anything online about it.

  1 Comment

Are the data in "date" ordered? Try using sort before plotting (sort both x and y of course).

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1 Answer

Answer by per isakson
on 12 May 2014
Edited by per isakson
on 12 May 2014
 Accepted Answer

Change the line
date = datenum(inpdata(:,1),'mm/dd/yyyy');
to
date = datenum(inpdata(:,1),'dd/mm/yyyy');
.
Comment: datenum accepts month number 23
sdn = datenum('23/08/2008', 'mm/dd/yyyy' )
datestr( sdn, 'yyyy-mm-dd HH:MM:SS' )
returns
ans =
2009-11-08 00:00:00

  1 Comment

Well that's embarrassing! Definitely spending too much time in front this computer!
Many thanks per isakson

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