ss2tf always outputs error with line 1, stopped working

Hi, ss2tf was working fine and I was able to use it for my code successfully the first few times. However, for some reason, it stopped working and would always display the same error when I try to run my m-file:

This is the content of the said m-file, for your reference:

I've tried restarting MATLAB for so many times. I've also tried having my code run in other computers and it worked perfectly fine. If it's of any help, I'm using MATLAB R2020a, with a license provided by my university. The control system toolbox is also installed.

[Steven Lord]

Let's make sure you're calling the ss2tf function provided by MathWorks and not another ss2tf.m that's shadowing it. Please execute this command and show us what it displays.

which -all ss2tf

Answer 1

[Star Strider]

You probably want:

[num,den] = ss2tf(A,B,C,D,1)

rather than:

[num,den] = ss2tf(A,B,C,D,l)
                          ↑ ← NOTE THAT 'l' ~= 1

The same problem also appears to exist in the vectors and matrices themselves.

[SB]

Hi, I've double checked the code and there seems to be no occurence of the character "l" replacing 1s. I've also had the same m-file run in other computers and they were able to run the code without any errors.

[Star Strider]

Since you did not provide the actual code, only an image of it, there is no way we can determine what the problem is other than by looking at it.

Make it easy for us to help you, rather than absolutely impossible.