Get the equation of the graph plotted into the workspace OR how the equation can be generated explicitly ?
조회 수: 1 (최근 30일)
이전 댓글 표시
I obtained the equation of a graph plotted using the Basic fitting option ( Plot the graph-> Tools-->Basic Fitting-->show equations). But, can some one explain how these equations are calculated( say, for a 3rd degree polynomial function)? Is there a code available for this? Any ideas is highly appreciated.
댓글 수: 0
채택된 답변
jonas
2018년 10월 4일
편집: jonas
2018년 10월 4일
Let x and y be your data.
Use polyfit to fit coeffecients to your data using a third order polynomial.
P = polyfit(x, y, 3)
Evaluate the data at points xe
xe = ...
ye = polyval(p, xe)
You can then plot xe and ye alongside your data.
If what you are really looking for is how the fitting is performed inside of polyfit, then read about least-square fitting
댓글 수: 0
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!