How can I plot datetime as x-axis in pcolor ?
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Hello Seniors,
I have time(datetime - 6047X1) need to be in x-axis, height(numeric value - 27X1) as y axis, C(27X6047) numeric values.
I am having error(Error using pcolor (line 65) Data inputs must be real.) while I want plot by using pcolor.
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Shubham Gupta
2019년 10월 14일
One of the way can be:
dt = [datetime('yesterday'),datetime('today'),datetime('tomorrow')];
y = 1:3;
C = [3 4 5; 1 2 5; 5 5 5];
pcolor(datenum(dt),1:3,C)
a = gca;
a.XTick = datenum(dt);
a.XTickLabel = datestr(datenum(dt));
I am not sure if that's what you want but let me know if you have doubts.
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Adam Danz
2019년 10월 14일
편집: Adam Danz
2019년 10월 14일
There must be imaginary data in your inputs. Here's a demo with valid datetime inputs.
dt = [datetime('yesterday'),datetime('today'),datetime('tomorrow')];
y = 1:3;
C = [3 4 5; 1 2 5; 5 5 5];
pcolor(dt,1:3,C)
To determine if imaginary data exist anywhere within a numeric array, use isreal() which will either return a TRUE or FALSE indicating whether all of the data in your array are real numbers. If it returns a false, you can use imag() to find the element that is not real.
Note that pcolor() did not accecpt datetime values prior to r2019b.
In current documentation you can see that datetime is listed as an accepted data type. In r2019a documentation, pcolor does not list datetime as an accepted input. Using datetime as an input to pcolor() in r2019a or earlier will result in the error, "Data inputs must be real."
댓글 수: 5
Adam Danz
2019년 10월 15일
Logical indexing would be best. Suppose your date vector is named dt,
idx = dt>=DATE1 & dt <=DATE2;
Then you could set those values to NaN,
x(idx) = NaN;
y(idx) = NaN;
pcolor(x,y,C)
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