Simulink if action block

Hello I have another question regarding simulink if action block.

I would like to use a value ,which enters to if block, as a variable in if action box. Should i define this variable in matlab editor again ? My problem was as an image to this post attached. the rest parameters i already defined.

Answer 1

[Kaustubha Govind]

You cannot use an input signal as a Gain parameter. Instead, you may want to replace the Gain block with a combination of Constant and Product blocks, so you can multiply the input with constants (which is what you're trying to achieve with the Gain block).