Fitting curve through data set
조회 수: 1 (최근 30일)
이전 댓글 표시
Hi Im interested to plot XY which is a curve also Im interested to fit a best fit curve through data which should follow the data trend as is and then the point from where curve is changing or having maximum curvature, (X-value at that point) and a best fit line from the trend where values are straight to get intercept, After getting intercept I would like to use intercept and slop to draw another model on same graph. please see the attached figure for detailed idea.
Guide me please Thank you
댓글 수: 4
채택된 답변
Chad Greene
2014년 6월 9일
Given data at x and y, if you want a ytrend = m(xtrend) + b slope intercept form of the trend line, you can get it by
P = polyfit(x,y,1);
m = P(1);
b = P(2);
Make up some x values for the trend line:
xtrend = min(x):max(x);
Now the trend line is
ytrend = m*xtrend + b;
댓글 수: 3
Chad Greene
2014년 6월 10일
The steps above only calculate the trendline. After you've calculated the trend line, try
plot(x,y,'ro'); % plots your original data
hold on; % allows you to plot more data
plot(xtrend,ytrend,'k-') % plots the trend line
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Get Started with Curve Fitting Toolbox에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!