Pointer on the graph.

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?

[Sumit Tandon]

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

Answer 1

[Image Analyst]

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.