# How can I plot datetime as x-axis in pcolor ?

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Jeevan Kumar Bodaballa 2019 年 10 月 14 日
コメント済み: Adam Danz 2019 年 10 月 15 日
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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Jeevan Kumar Bodaballa 2019 年 10 月 15 日
Thanks a lot it worked.
A small question that is any simple command to see specific dates from whole time.
for example : I have time scale 01/01/2015 to 10/02/2015. And now I want plot only 10/01/2015 to 15/01/2015. (with/without using logical index).

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### 採用された回答

Adam Danz 2019 年 10 月 14 日

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."
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Adam Danz 2019 年 10 月 15 日
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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