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# Thread Subject: Using if statement in BVP4C

 Subject: Using if statement in BVP4C From: Sonny Date: 29 Jul, 2014 22:13:10 Message: 1 of 1 I am trying to solve a boundary value problem, but where the ODE have a different constant added to the ODE if x<0 and one when x>0. If it possible to use and IF statement in the odefunc(x,y)??? My code is as follows function dydx = odefunc(x,y) %constant defined in problem a = .9; sig = 2; h = 2; c = 3; p = 1; g = 2;     y = [y(1);y(2)];     A = [0 1; 2*a/(sig^2) 2/(sig^2)*((g)/g+1)^(g+1)*(1/(y(1)+c))^(g+1)]; %The Diff eq     constant_xneg = [ 0; -(2/sig^2)*(p-a*c)];%The negative case     constant_xpos = [0;(2/sig^2)*(h+a*c)]; %The positive case          if x>0        dydx = A*y + constant_xpos;     elseif x<0        dydx = A*y + constant_xneg;     else         dydx = A*y;     end end

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