assign background color to average of points

Hey guys! I am new to matlab and I am trying to figure this problem out... I have a program that calculates some operations and then gives me a series of numbers of 1, 2 or 4 (the variable’s name with the numbers 1, 2 or 4 is S) which then I plot (Image2 in attached files).

I would like each point to be the average of the three points (the one before and the one after and the point himself) and assign a color to the background for each number. For ex, when the average is 1, I would like a red color in the background, dark blue for 2 and yellow for 4 (if other colors are better, I am open to it). When the average is not 1, 2 or 4 but:

- 1+1+2 (or 1+2+1, or 2+1+1)=4/3=1.333

- 1+2+2=5/3=1.667

- 1+1+4=6/3=2

- 1+4+4=9/3=3

- 2+2+4=8/3=2.667

- 2+4+4=10/3=3.333

I would like an intermediary color.

For the numbers between 1 and 2 I would like to assign colors between red and dark blue: - Pink for 1,333 and purple for 1,667

For the numbers between 1 and 4 I would like to assign colors between red and yellow: - Pale orange for 2 and dark orange for 3

For the numbers between 2 and 4 I would like to assign colors between blue and yellow: - Green for 2.667 and pale blue for 3.333

The aim is to have a kind of continuity (visually) between the numbers from 1 to 4, and would look something like the Image3 (only the beginning).

Thanks in advance for any help!!

Answer 1

[Image Analyst]

Try conv() or movmean()

aveSignal = conv(signal, ones(1,3)/3, 'same');

Then use patch() or fill() to fill the rectangles with color.

[Anastasia]

Thank you very much! This line of code is to create the average of the three points, and I managed to plot that.

When i am trying to create and fill rectangles with color, i am trying to use the fill function, however i don't obtain anything. I put:

stairs(tp,aveSignal,'k');
fill(tp, 1, 'r'); 
fill(tp,2,'m'); 
fill (tp, 1.3333, 'y') 
etc.

tp is my X, and I want to create rectangles with the parts of tp when y=1, another when y=2 etc. Where did I make an error?

Also, I would like for the rectangles to be big if possible (as in image3), and not only the part under the line to be colored.

Finally, is it possible instead of using 'r', 'm', etc to tell him to use gradients of color for ex. between 1 and 2; 2 and 4?

Thank you! I am sure this is basic, so I am sorry to bother you.

[Anastasia]

Hello, I realize that what i asked is a little bit complicated, I gave up on the gradients of color; however I would really appreciate some feedback and help on writing the appropriate code for patch or fill functions... Can I give your more info? Thank you!

[Anastasia]

Does the program need to determine some sort of coordinates first (every time the y=1 begins and ends; everytime y=2 begins and ends etc...). I have the impression that I need coordinates to create the rectangles with these functions?

[Image Analyst]

I'm totally confused. I have no idea how you got image3.png. I don't even see the patches on top of your data.

fill() and patch() have descriptions in the help for how to use them. I think one or both of them let you specify the opacity/transparency/alpha of the colored patch.

[Anastasia]

Hello, I am sorry that it's not very clear. I got image3 by myself putting rectangles to illustrate what I would like to do.

I looked at the the help sections for fill() and patch() (and I found how to specify the characteristics of the color patch), however I still have a problem to position my rectangle at the right place, I find that they need clear x-y coordinates for each point to draw the rectangle. However, what I would like to do is to assign a background color for each y = something (1,2 or 4) (when y=1, I need a red rectangle in the background; when y=2, a yellow one etc), however in this case I don't know the exact coordinates for x. Is it more clear now?

Thank you very much again!

[Image Analyst]

Do you want to create an RGB image, or do you want to still have a graph (with axes, tick marks, etc.) with the black data lines plotted on it but with colored translucent boxes overlaid on the graph?

[Anastasia]

Hello, only RGB image would be perfect, without the graph! Thank you for your response!

[Image Analyst]

Unfortunately you forgot to attach your data. I'll check back later for it. And how many distinct colors do you want? Is your data integers only, or fractional numbers? Do you want one color for each integer? Or thousands of colors for thousands or millions of possible floating point numbers?