Unable to compute taylor expansion using taylortool

Im trying to use taylortool but keep getting "cant compute taylor expansion", and I think it is because my function has decimal points.

If f(x) does not have a decimal point, it works fine, even with fractions like (1/4*x*cos(x)).

Answer 1

[VBBV]

Since you are using a Edit box to read the function, it returns a string expression

A = 1.176*x*cos(x);  % A is variable to read the input function entered
str2sym(A)  %  convert to string function to symbolic expression and try 

An example shown below works fine

syms x
f = 1.176*x*cos(x);
T6 = taylor(f,x)

T6 = 

[VBBV]

I think it may be due to the order used for the expression to evaluate the expansion

syms x
f = 1.176*x*cos(x);
T6 = taylor(f,x,'Order',1)  % this might be reason

T6 = 

0

syms x
f = 1.176*x*cos(x);
T6 = taylor(f,x,'Order',2)

T6 = 

[Torsten]

@Rafael comment moved here:

To make my function work, my f(x) is 1176/1000*x*cos(x), but I think it's weird that 1.176 doesn't work