Question

why the error comes

100% E52 Wed 7:41 AM MATLAB R2016a g (CHUNG HA)-"Snap... EDITOR PUBLISH VIEW Close on S+one www.youtube.com insert Efx P Recommended: Stone Musl... Settings ment Breakpoints Run Run and Advance Run and ndent Advance Time LDIT BREAKPOINTS RUN ents MATLAB Editor /Users/xinyuli/Documents/MATLAB/EMEC 5671Assign2.m EMEC 5671Assign2.m bisect.m W4 + 117 118 W5.Duffing's oscillator function dxedxdt (t,x) 119 120 121 dx(1,1)x(2,1); dx(2,1)-e.25x (2,1)+x(1,1)-x(1,1)^3+0.3*cos (t) ; 122. 123- 124 125 end tspan [e 60]; xe [e;11 It,x]-ode45(@dxdt, tspan, x0) ; figure(1) subplot (2,1,1) plot (t,x(:,1)) subplot (2,1,2) plot(t,x(:,2)) figure(2) 126- 127 128 129 130- 131- 132- 133- 134 Command Window be a Reference page for function >> EMEC_5671Assign2 Error: File: EMEC 5671Assian2.m Line: 113 Column: 21 Function definitions are not permitted in this context. >EMEC 5671Assign2 Error: File: EMEC 5671Assign2.m Line: 113 Column: 21 Function definitions are not permitted in this context. Ln 120 Col dxdt W

Answer 1

I think you are defining the function 'dxdt' inside the function 'EMEC_5671Assign2' which is not allowed in MATLAB. Hence you get the error 'Function definitions are not permitted in this context'.

So it would be better to define all the other functions in another M-file and call those functions later in your main function i.e 'EMEC_5671Assign2' later. It will not give any error then unless you have made any syntax error.