Operator '==' is not supported for operands of type 'tf'

1) Making a dialog box that would take my answers in s1 and compare with s2 and output a cell array.

2) By using the results of the cell array 1 0, 01 or 0 0 i made an if statement to perform calculations

the code runs fine the issue is when press cancel in before i get to this part an error appears as such:

Answer 1

[Fangjun Jiang]

The reason:

1. When you click "cancel" in the inputdlg(), your variable "tf" is not evaluated.
2. When the second part of the code is executed, it regards "tf" as the built-in tf() function.
3. You can replicate the same error by doing this "clear tf; tf(1)==1'
4. Easiest solution is to name variable "tf" to something else. But still you need to handle the cituation where the variable is not evaluated when "cancel" is clicked.

[Steven Lord]

Alternately defined tf so it is unambiguously a variable along all the code paths through your function. If you define tf to be false prior to the try/catch then MATLAB should be able to tell it is always a variable and parse the code accordingly.

[Ronald Godagandeni Dewage]

ill tried to return the script once clicked cancel, basically the 'answer' variable cell become blank when clicked cancel. how do i use tht infromation to stop the script from running.

i tried:

if answer(1)==isempty(1)

return

end

it doesnt work

[Fangjun Jiang]

if isempty(answer)

Answer 2

[David Hill]

if tf %already logical
   
end