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# How to associate and color points based on distance or search radius and contour them?

조회 수: 11(최근 30일)
Abdelrahman Abdeltawab 2016년 11월 26일
댓글: Xel Ch 2018년 6월 27일
I have scatter plot shown in first image
what is the best method to reach the result in second image?  댓글을 달려면 로그인하십시오.

### 답변(1개)

Jose Lara 2016년 12월 5일
Abdelrahman, if you know the temperature for each of the coordinate given, you could create your own gradient of color.  If you have a matrix with the coordinates, for example:
coords = [1 2 3 4 5 6 7 8; 2 5 7 8 9 9 0 3];
then you may iterate through each point and designate it's own color depending on the resulting temperature. If the equation for the temperature is as follows:
T = x^2 +y/2 +1;
using a for loop, you can iterate through each point and plot with the correct color. Example code is shown below:
for i = 1:8 %number of coordinates
hold on
xi = coords(1,i);
yi = coords(2,i);
T =  xi^2 + yi/2 +1;
if T > 10;
plot(xi,yi,'ko')
elseif (T<10) && (T>8)
plot(xi,yi,'bo')
elseif (T<8) && (T<4)
plot(xi,yi,'ro')
else
plot(xi,yi,'go')
where the third argument of the ''plot'' function will be the color of the point and the marker type. You may separate the temperatures with more colors by using a RGB color values such as [1 0 0] for red and [1 1 1] for white.
Check out the following link for more information on the ''plot'' function: http://www.mathworks.com/help/matlab/ref/plot.html
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Xel Ch 2018년 6월 27일
Hi Abdelrahman. I am looking to do something similar in Matlab, so was wondering if you were ever able to get this issue resolved? And if so, what did you do? Thank you!

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