These codes are wrong:
syms bt;
f=415136356873531/(2251799813685248*bt) + 703048105211593/70368744177664
fplot(@(bt) f,[0.01 1],'b')
But these codes are right:
syms bt;
fplot(@(bt) 415136356873531/(2251799813685248*bt) + 703048105211593/70368744177664,[0.01 1],'b')
Are they not same?
syms bt;
f=415136356873531/(2251799813685248*bt) + 703048105211593/70368744177664
fplot(@(bt) f,[0.01 1],'b')
The syntax is completely wrong here.
Pass bt to the function f as argument, with syms function just use subs
@(bt) f --------> @(bt) subs(f)
syms bt;
f=415136356873531/(2251799813685248*bt) + 703048105211593/70368744177664
fplot(@(bt) subs(f),[0.01 1],'b')
Correct syntax:
Since f is already a function why defining a new function handle
to duplicate an existing function?
With fplot() you can use directly syms function
syms bt;
f=415136356873531/(2251799813685248*bt) + 703048105211593/70368744177664
fplot(f,[0.01 1],'b')