How do you change the color of a selected area under a curve
6 ビュー (過去 30 日間)
古いコメントを表示
I want to change the color of the selected area to say black. Ultimately, I want to have several areas filled with different colors. I know Matlab has specific built-in functions for normal curves, but I want to use my own for learning. Here is some code:
function [P] = N(u,sd,L1,L2)
y1=NC(u,sd,L1);
y2=NC(u,sd,L2);
x=[u-(sd*5):.01:u+(sd*5)];
xL=(L1:.1:L2);
Px = (1/(sqrt(2*pi)*sd)).*exp((-(x-u).^2)./(2*sd.^2));
PxL = (1/(sqrt(2*pi)*sd)).*exp((-(xL-u).^2)./(2*sd.^2));
hold on;
plot(x,Px,'k','LineWidth',4);
area(xL,PxL); %**** THIS IS THE COLOR I WANT TO CHANGE *****
title('Normal Plot - P(x) vs. x');
xlabel('x'); ylabel('P(x)');
axis([u-(sd*5),u+(sd*5),0,max(Px)]);
line([L1,L1],[0,y1],'color','r','LineWidth',2);
line([L2,L2],[0,y2],'color','r','LineWidth',2);
hold off;
function [y]=NC(u, sd, L)
y=(1/(sqrt(2*pi)*sd)).*exp((-(L-u).^2)./(2*sd.^2));
Thanks
1 件のコメント
Jonathan Epperl
2012 年 12 月 11 日
What is wrong with area? See http://www.mathworks.com/help/matlab/ref/area.html and in particular the example on the very bottom.
Alternatively you could use the lower-level function patch.
回答 (1 件)
Babak
2012 年 12 月 11 日
Here it is: Note that I only changed your plot() function to fill() and I added the end point and the first point of your data to the data again. With this, the curve will be closed! and fill would fill color int he closed curve... hope it helps you and answers your question.
function [P] = N(u,sd,L1,L2)
y1=NC(u,sd,L1);
y2=NC(u,sd,L2);
x=[u-(sd*5):.01:u+(sd*5)];
xL=(L1:.1:L2);
Px = (1/(sqrt(2*pi)*sd)).*exp((-(x-u).^2)./(2*sd.^2));
PxL = (1/(sqrt(2*pi)*sd)).*exp((-(xL-u).^2)./(2*sd.^2));
hold on;
fill([x , x(end), x(1)],[Px, Px(end),Px(1)],'k'); %,'LineWidth',4);
%area(xL,PxL); %**** THIS IS THE COLOR I WANT TO CHANGE *****
title('Normal Plot - P(x) vs. x');
xlabel('x'); ylabel('P(x)');
axis([u-(sd*5),u+(sd*5),0,max(Px)]);
line([L1,L1],[0,y1],'color','r','LineWidth',2);
line([L2,L2],[0,y2],'color','r','LineWidth',2);
hold off;
function [y]=NC(u, sd, L)
y=(1/(sqrt(2*pi)*sd)).*exp((-(L-u).^2)./(2*sd.^2));
0 件のコメント
参考
カテゴリ
Help Center および File Exchange で Graphics Performance についてさらに検索
製品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!