Scatter plot - different colour marker for night and day

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Anya Schlich-Davies
评论： Ali 2017-10-29
Hi,
I have hourly radiation data for the whole year (8760 values in total) have used scatter plots to plot this data. My time data is in 'dd-mm-yyyy HH:MM:SS' format and I used startdate/enddate and linspace for this. I was hoping to colour the markers by the time of day e.g. red for 0600-1800 and blue for 1800-0600 but have no idea how to do this as am relatively new to Matlab.
Does anyone know how to do this?
Thanks
  1 个评论
Ali
Ali 2017-10-29
if true
--------------------------------------------------- code start
This is an example for your case
Input is "Input_Data", two dimension matrix
Marker_Counter=1;
figure6=figure;
Markers = {'+','o','*','x','v','d','^','s','>','<'};
for i=1:10:size(Input_Data,1)
TPR=Input_Data(i:i+9,7);
FPR=Input_Data(i:i+9,8);
plot(FPR,TPR,strcat('-',Markers{Marker_Counter}));
Marker_Counter=Marker_Counter+1;
hold on
end
plot([0.5 1],[0.5 1],'--');
legend('Minpts = 100','Minpts = 200','Minpts = 300','Minpts = 400','Minpts = 500','Minpts = 600','Minpts = 700','Minpts = 800','Minpts = 900','Minpts = 1000','','Location','SouthEast');
xlabel('FPR or (1-Specificity)','FontSize',12,'FontWeight','bold'); ylabel('TPR or Spensitivity)','FontSize',12,'FontWeight','bold');
title('ROC Space');
close(gcf);
-------------------------------------------- code end
end
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回答（1 个）

dpb
dpb 2017-2-19
编辑：dpb 2017-2-20
Presuming you converted to datetime array for the times, then
Well, here, let's just build a sample...
>> t=datetime(2001,1,1,[0:365*24].',0,0); t(end)=[]; % 8760-long hourly datetime series
>> iday=iswithin(hour(t),6,18)+1; % vector of day/night indices 1==>night, 2-->day
>> [min(iday) max(iday)] % show the above is so...
ans =
1 2
>> c=[[0 0 1];[1 0 0]]; % colors blue and red as members of 2-element array
>> clr=c(iday,:);
>> whos clr
Name Size Bytes Class Attributes
clr 8760x3 70080 double
>>
Now just pass the clr array to scatter and voila! you'll get the two colors.
What would be kinda' cute here would be to find a sunrise/sunset calculator and tie the colors to it instead of just fixed hours.
scatter only takes a vector of RGB triplets; a thread came up just a week ago or so where I pointed out it would be useful to be able to use the named colors in same way. A TMW employee agreed would be worthy of enhancement request; don't know if he picked it up or not and did so; I'd done it years and years ago.
Oh, almost forgot -- iswithin is a utility routine of mine; just "syntactic sugar" for the double-comparison. It's just
>> type iswithin
function flg=iswithin(x,lo,hi)
% returns T for values within range of input
% SYNTAX:
% [log] = iswithin(x,lo,hi)
% returns T for x between lo and hi values, inclusive
flg= (x>=lo) & (x<=hi);
>>
one can always just write the conditional expression, but it can get very messy in indexing or other more complex expressions so the factorization often makes for much cleaner-looking user code.
ADDENDUM
I just remembered there's a new TMW function isbetween that does same thing for datetime values. Oh, but hour returns a double array and it can't handle them and doesn't seem to have options for the intervals of other than dates. So, the above seems the route; doesn't look like the datetime class does anything else for you here.

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