How to write a value on a specific portion which is constant on a graph?

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yashvin
yashvin 2015-7-1
评论： yashvin 2015-7-2
Hi ,
I want to write something on parts of a graph which are constant.
For example,
a=[1 2 2 2 2 2 2 2 2 2 3 5 5 5 5 5 5 5 ]
b=[1:1:length(a)]
plot(b,a)
My graph is attached.
For the portion on the xaxis, from 2 to 10, i want to write "level=2" on top of the constant line and from 12 to 18, i want to write "level 5" on top of the constant line.
Anyway of doing it in MATLAB?
  2 个评论
yashvin
yashvin 2015-7-1
Hi Nick,
I want to automate. Find below part of my code and a .png of my graph. I should have been more accurate in my question. It is actually a DATETIME plot. So inserting it as a text does not work.
Numberofalt=length(out_select(:,1))
colorVec = hsv(length(out_select));
for i=1:Numberofalt
plot(time_select_20000(out_select(i,2):out_select(i,3)),Alt_select_20000(out_select(i,2):out_select(i,3)),'Color',colorVec(i,:),'LineWidth',2)
hold on
end
On top of each line , that i generate in the plot, i want to write down a corresponding value which corresponds to any of the values of
Alt_select_20000(out_select(i,2):out_select(i,3))
which is actually a constant number. See the graph i generate.

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Stephen23
Stephen23 2015-7-1
编辑：Stephen23 2015-7-1
Try this:
a = [1,2,2,2,2,2,2,2,2,2,3,5,5,5,5,5,5,5];
b = 1:numel(a);
%
d = [1,diff(a),1]; % differences between values
s = find(d(1:end-1)); % begin of contiguous blocks
e = find(d(2:end)); % end of contiguous blocks
n = e-s;
x = n>0; % select how many must be in a block
p = mean([s(x);e(x)],1); % x-positions
v = a(s(x)); % y-positions
t = arrayfun(@(n)sprintf('level %g',n),v,'UniformOutput',false);
%
plot(b,a)
text(p,v,t,'VerticalAlignment','top')
Which generates this figure:
Note that I placed the text under the line as the axes do not resize automatically to fit the text. Of course you can change this and many other options, such as the horizontal alignment, typeface, font size etc. See the text properties for more info on this.
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yashvin
yashvin 2015-7-2
Hi yea now it works!! So the main thing was to use the datenum ! Awesome thanks!

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