Differences between R2017a and R2019a

R2017a allows use of leters in 1st order transfer function but R2019a does not. Am I missing an extra step in R2019a. eg In R2017a, For 1st order Transfer Function Block, Changing denominator from [1,1] to [L,R] works but refuses for R2019a. Trying to create 1/(Ls+R)

MATLAB Version: 9.6.0.1307630 (R2019a) Update 7

MATLAB Version: 9.2.0.1226206 (R2017a) Update 4

Thanks

[Ameer Hamza]

Can you post the code which works in R2017a but not in R2019a?

[James Robertson]

Appreciate the interest. I can send the simple simulink model that was created in R2017a and cannot be recreated in R2019a or R2019b

Thanks

James

[Ameer Hamza]

Can you send the model or post a picture of your model?