MATLAB: How to draw such bars in matlab? a bar filled with dots another with lines etc.

barsmatlab graphs

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Refer the MathWorks blog by Jiro Doke :

http://blogs.mathworks.com/pick/2011/07/15/creating-hatched-patches/

The above link explains about creating Hatched Patches, with an example.

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MATLAB: Image features such as average, energy etc.

Yes, of course it can. Just pick one that is meaningful for what you want to discover about the image. Which one you pick depends on what you want to find out about the image. Maybe it's the mean, or maybe it's the average blob diameter, or maybe it's the area fraction or standard deviation or whatever. What do you think you might want to measure? Can you attach and image and explain what things are in it and what you want to measure?

MATLAB: How to explicitly change the colors of the bars in a stacked bar graph

You can use the Color Data (CData) property for bar graph released in R2017b.

You can change the color for a particular bar by setting the FaceColor property to 'flat'. Then, change the corresponding row in the CData matrix to the new RGB triplet. Here is the link for the CData property in bar graph:

https://www.mathworks.com/help/matlab/ref/bar.html#input_argument_namevalue_d119e63137

For example,

a = [1,3,6;2,5,6;8,2,1];
H=bar(a, 'stacked');
colorSet = [];
for i = 1:3
    myColors = round(rand(3,3),1);
    colorSet = [colorSet myColors];
    H(i).FaceColor = 'flat';
    H(i).CData = myColors;
 end
This will display the stacked bar plot with different colors.

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MATLAB: Image features such as average, energy etc.

MATLAB: How to explicitly change the colors of the bars in a stacked bar graph

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