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Pointer on the graph.

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Artyom
Artyom 2012-7-25
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?
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Sumit Tandon
Sumit Tandon 2012-7-25
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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Image Analyst
Image Analyst 2012-7-25
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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