Hi Bobby,
syms F(t)
The above command implies that 'F' is a symbolic function. Hence, the command
invF0=subs(invF(t))
does not give error.
However, 't' is defined as a symbolic variable, and so, 'DexpAt' is also a symbolic variable. As variables cannot take any input arguments, the below command gives an error.
DexpA0=subs(DexpAt(t))
For the above command to run without any error, you can define 'DexpAt' also as a symbolic function by changing
DexpAt=diff(expAt)
to
DexpAt(t)=diff(expAt)
You can check your workspace to confirm if any symbol is a symbolic function or a symbolic variable.
For additional information on symbolic variables and functions, refer to the following link:
Regards,
Divija
