Where is the mistake? Taylor Series in matlab?

Hi everyone

i want to use taylor in matlab but i seem to have made a mistake here

here:

syms T

alpha = 0.056;
beta = 0.0000186;
R = 2000;
(-100<T) && (T<200)
f = R*(alpha+0.0078*(T-25)+beta*(T-25)^2);

taylor1 = taylor(f,'Order',1);
pretty(taylor1)

and i want to find out for T = 80

It says "Conversion to logical from sym is not possible." Can somebody correct or at least tell me what i did wrong

Answer 1

[VBBV]

syms T

alpha = 0.056;
beta = 0.0000186;
R = 2000;

f = R*(alpha+0.0078*(T-25)+beta*(T-25).^2);
f = subs(f,T,80);  
taylor1 = taylor(f,'Order',1);
pretty(taylor1)

19969153862112801076895
-----------------------
  18446744073709551616

[VBBV]

use subs to substitute T for 80

[Karl-JR]

Thanks a lot🙏

[Torsten]

@VBBV

You can't substitute T = 80 before you use "taylor".

I think the aim of the exercise is to see how well the Taylor series of order 1 approximates f(80).