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Given a datetime plot, how to i insert a text in the plot?

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yashvin
yashvin 2015-7-2
关闭： Stephen23 2015-7-2
Hi I have a datetime plot. I want to insert a text in a specific part of the plot. Since my xaxis is no longer an integer, I am getting error while using "text".
How can i solve it?
x_p=time_select_20000(out_select(i,2):out_select(i,3));% datetime array
y_p=Alt_select_20000(out_select(i,2):out_select(i,3));%integer
plot(x_p,y_p)
i=1;
a=time_select_20000(out_select(i,2));%datetime point
b=Alt_select_20000(out_select(i,2));%integer point
n=10
str1 = sprintf('Flight level : %d',n)
text(a,b,str1)
I am getting this error
Error using text
First two or three arguments must be numeric doubles.
How do i change the datetime to satisfy this?

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