how can i draw some points but diferent colors depends of a condition?

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Erick Guzman
Erick Guzman 2022-6-19
评论： Erick Guzman 2022-6-19
while n<= l
if 0<d(p)<=10
h=images.roi.Point(gca,'Position',[x(n) y(n)],'Color','b');
elseif 10<d(p)<= 20
h=images.roi.Point(gca,'Position',[x(n) y(n)],'Color','y');
elseif 30<d(p)<= 40
h=images.roi.Point(gca,'Position',[x(n) y(n)],'Color','m');
else
h=images.roi.Point(gca,'Position',[x(n) y(n)],'Color','g');
end
p=p+1;
n=n+1;
end
thats the code basicly, i wanna draw the point of a specific color if the distance between 2 points are between 0 and 10, for example this point should be blue.
continue the cycle we check de distance from the next point, to know whats the distance and draw it with the respect color.
currently the issue is every point is blue, because its the first condition, if i change this blue for another color then all points will be of this color, it seems like only takes the first one.
if someone can help please :(

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采纳的回答

Walter Roberson
Walter Roberson 2022-6-19
if 0<d(p)<=10
MATLAB interprets that as
if ((0<d(p))<=10)
The first comparison is made, 0<d(p) giving you a response of 0 (false) or 1 (true). Then that 0 or 1 is compared to 10 -- and since both 0 and 1 are <= 10, the result is always true.
  1 个评论
Erick Guzman
Erick Guzman 2022-6-19
thanks, you answer open my mind but you dont tell me how do it literally hahahha.
thanks so much.
i do it with:
if (dm(p)<=10)
h1=images.roi.Point(gca,'Position',[x(n) y(n)],'Color','g');
elseif (10<dm(p) && dm(2)<= 20)
h1=images.roi.Point(gca,'Position',[x(n) y(n)],'Color','y');
elseif (20<dm(p) && dm(2)<= 30)
h1=images.roi.Point(gca,'Position',[x(n) y(n)],'Color','b');
else
h1=images.roi.Point(gca,'Position',[x(n) y(n)],'Color','b');
end

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