Error using mupadmex Error in MuPAD command: The second argument must be of form x or x = a..b. [int] Error in sym/int (line 107) rSym = mupadmex('symobj::intindef',f.s,x.s,options);

Question

回答： Walter Roberson 2015-6-11

I want to integrate function F w.r.t L but cant not able to do. If anyone know please tell

L=2.*exp(x);
E=exp(-x);
F=2.*E+exp(E);
int(F,L)

Answer 1

Walter Roberson 2015-6-11

You cannot integrate with respect to a function. You need to integrate with respect to a variable.

You might wish to do a change of variable, perhaps.

syms Lv
xv = solve(Lv=L,x);
Fv = subs(F,x,xv);
intv = int(Fv,Lv);
result = subs(intv, Lv, L);

Error using mupadmex Error in MuPAD command: The second argument must be of form x or x = a..b. [int] Error in sym/int (line 107) rSym = mupadmex('​symobj::in​tindef',f.​s,x.s,opti​ons);