Interactive manipulation with graph in Matlab

Hi,

I am trying to plot a graph that has a filling underneath it, and a threshold value like a bar that can vary, so that the filling of the areas separated by the threshold is differently colored. I should be able to that by combining the functions "area" and "bar".

I would like to make the graph interactive, namely I would like to see how the graph would look like if the threshold value varies. Basically I am looking for something that is very similar to the "Manipulate" function in Wolfram Mathematica (link for reference):

http://reference.wolfram.com/mathematica/ref/Manipulate.html

Any suggestion would be greatly appreciated. Many thanks in advance!

Answer 1

[Sean de Wolski]

Perhaps Doug's Challenge/Replies/Answer will be useful to you:

Blogs:Doug:Challenge/User_replies

Blogs:Doug:His_Answer

[Aleksandar]

Thanks a lot! I also got another idea by using a slider which was the one I was hoping to get, but this one by using the mouse is also very intuitive. I will experiment with both of the approaches and see which one fits better to my needs.

Answer 2

[Patrick Kalita]

You can achieve an effect similar to Mathematica's "Manipulate" by adding a uicontrol to your figure and programming it's Callback property to adjust the graph as needed. This requires some effort, but provides a lot of flexibility. Here is a very simple example:

% Make the plot
a = area( randn(1, 100) );

% Add a slider
uicontrol( ...
    'Style', 'slider', ...
    'Min', -3, ...
    'Max',  3, ...
    'Callback', @(src, evt) set(a, 'BaseValue', get(src, 'Value')));

[Aleksandar]

Thanks a lot, this is exactly what I was looking for! I also got another idea by using the mouse which is also very intuitive. I will experiment with both of the approaches and see which one fits better to my needs.