Pcolor of a time-series

Question

user20912 2022-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/1696670-pcolor-of-a-time-series

评论： Mathieu NOE 2022-4-19

HI. I have a very long time series which data is:

>> whos dt data1
  Name            Size            Bytes  Class     Attributes
  dt           3285x1             52560  double              
  data1        3285x1             26280  single         

where dt is the dates of 8 years. I have this idea of making a pcolor of this so I've already try the following:

data2 = repmat(data1,[1 2]);
dummy = ones(size(data2,2),1);

Now I have this:

>> whos data2 dummy dt
  Name          Size            Bytes  Class     Attributes
  dt         3285x1             26280  double              
  data2      3285x2             26280  single              
  dummy         2x1                16  double       

Then, I try a

pcolor(dt,dummy,data2)

But I get a white plot (see the attached image). Is my approach correct? If so, why do I get a white plot?

Thanks in advance.

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Answer 1

Mathieu NOE 2022-4-15

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hello

I suspect this is the intention - demo on "dummy" data

% dummy data
dt = (1:3285)';
data1 = single(rand(3285,1));
data2 = repmat(data1,[1 2]);
dummy = (1:size(data2,2));
[X,Y] = meshgrid(dt,dummy);
p = pcolor(X,Y,data2');
set(p, 'EdgeColor', 'none');