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);
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Walter Roberson on 11 Jun 2015
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.
xv = solve(Lv=L,x);
Fv = subs(F,x,xv);
intv = int(Fv,Lv);
result = subs(intv, Lv, L);