i have an error at line 13 xi1 and below it. how to correct it for runge kutta method
function [y1] = RK21(x0, y0, h, f)
%RK21.m apply one step of the explicit RK2 method
% with Butcher Tableau:
% 0
% 2/3 2/3
% 1/4 3/4
%
% xi1 = yk
% xi2 = yk + a21*h*f(xk + c1*h, xi1)
% yk+1 = yk + h( b1*f(xk+c1*h, xi1 ) + b2*f(xk+c2*h, xi2)
xi1 = 0;
xi2 = y0 + 2/3*h*f(x1/4+1/4*h, xi3/4);
y1 = y0 + h*( 1/4*f(x1/4+1/4*h, xi3/4) + 3/4*f(x1/4+2/3*h, xi2 ));function [y1] = RK21(x0, y0, h, f)
%RK21.m apply one step of the explicit RK2 method
% with Butcher Tableau:
% 0
% 2/3 2/3
% 1/4 3/4
%
% xi1 = yk
% xi2 = yk + a21*h*f(xk + c1*h, xi1)
% yk+1 = yk + h( b1*f(xk+c1*h, xi1 ) + b2*f(xk+c2*h, xi2)
xi1 = 0;
xi2 = y0 + 2/3*h*f(x1/4+1/4*h, xi3/4);
y1 = y0 + h*( 1/4*f(x1/4+1/4*h, xi3/4) + 3/4*f(x1/4+2/3*h, xi2 )); function [y1] = RK21(x0, y0, h, f)
%RK21.m apply one step of the explicit RK2 method
% with Butcher Tableau:
% 0
% 2/3 2/3
% 1/4 3/4
%
% xi1 = yk
% xi2 = yk + a21*h*f(xk + c1*h, xi1)
% yk+1 = yk + h( b1*f(xk+c1*h, xi1 ) + b2*f(xk+c2*h, xi2)
xi1 = 0;
xi2 = y0 + 2/3*h*f(x1/4+1/4*h, xi3/4);
y1 = y0 + h*( 1/4*f(x1/4+1/4*h, xi3/4) + 3/4*f(x1/4+2/3*h, xi2 )); matlab MATLAB Answers — New Questions