Curve fitting with a known coefficient
조회 수: 12 (최근 30일)
이전 댓글 표시
I want to fit set of data points (x,y) to the equation 'g*x+a*(x/248.7860)^3*c'. Here g and a are unknown coefficients and x is independent variable. c is coefficient which is an array of size same as x (c varies with x but it is not weight) c is known. How to do the fitting? I tried the following: ft = fittype( 'g*x+a*(x/248.7860)^3*c', 'independent', 'x','independent', 'c', 'dependent', 'y' ); But it is not working. Any other way to solve?
댓글 수: 1
Valentin Fazenda
2020년 3월 9일
I have the same problem but with a complex equation :
PA=fittype('(Fz*(b1*Fz+b2))*sind(b0*atand((((b3*(Fz^2)+b4*Fz)*exp(-b5*Fz))/(b0*(Fz*(b1*Fz+b2))))*(x+(b9*Fz+b10))-((b6*Fz^2+b7*Fz+b8)*(1-b13*sind(x+(b9*Fz+b10))))*((((b3*(Fz^2)+b4*Fz)*exp(-b5*Fz))/(b0*(Fz*(b1*Fz+b2))))*(x+(b9*Fz+b10))-atand((((b3*(Fz^2)+b4*Fz)*exp(-b5*Fz))/(b0*(Fz*(b1*Fz+b2))))*(x+(b9*Fz+b10))))))+(b11*Fz+b12)','problem', 'Fz');
where Fz is known and is an (known) array of size same as x and i dont' know how write it so that Fz will not anymore be calaculated but used by the computer
답변 (2개)
David Sanchez
2013년 7월 4일
You can use the curve fitting tool. Type:
cftool
at the command window. Then, select " custom equation " as your target and type your equation on the right box.
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!