Pointer on the graph.

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Artyom
Artyom on 25 Jul 2012
Hi everyone. There is 1x100 array. Is there any function that can show me (for example with pointer or another color) on the graph all points that higher 100?
  1 Comment
Sumit Tandon
Sumit Tandon on 25 Jul 2012
One simple approach could be to use a combination of thresholding and logical indexing to identify these points and plot them. Example:
x = randi(150,[1,100]);
z = x;
z(x<100) = NaN;
hold on
plot(x)
plot(z,'*r')
hold off

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Accepted Answer

Image Analyst
Image Analyst on 25 Jul 2012
Sumit had a good suggestion if you want to use colors and marker shapes. If you want pointers like arrows, then you can use the annotation() function:
annotation
Create annotation objects
Syntax
annotation(annotation_type)
annotation('line',x,y)
annotation('arrow',x,y)
annotation('doublearrow',x,y)
annotation('textarrow',x,y)
annotation('textbox',[x y w h])
annotation('ellipse',[x y w h])
annotation('rectangle',[x y w h])
annotation(figure_handle,...)
annotation(...,'PropertyName',PropertyValue,...)
Of course you'd need the x,y coordinates of the arrow endpoints first.

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