Inbuilt sign block can be used to generate the signum function in Matlab simulink. Yes, we can use any signal as input to "sign" block. This block will not only work for simulation but also for experiment running through simulink, and i am telling you this with my personal experience. 

Dear Researcher

please check this,

http://appliedelectronicsengineering.blogspot.in/2013/11/generation-of-different-types-of.html

http://ieeecss.org/CSM/library/2001/aug01/03-LectureNotes.pdf

Hello,

I'm not sure what you expect the signum function to return. What it is defined to return is the sign. Problem: how do you code '+' resp. '-'.

The choice of +1/-1 is reasonable as these are numbers you can use subsequently.

E.g. abs(x) = sign(x) * x would be a valid implementation of the abs function.

Thank a lot for helping me @dreher @mohan @nalin

The signum function has to be used as an input to some circuit and as i was trying i am getting the result as shown in the pic that is attach here, pliz check and tell me if  it can still be considered as giving same effect as to be given by a signum function which actually goes from (-)ve infinity to (+)ve infinity in the x=axis

Hi,

am I right to assume that your sine wave has an amplitude of 1 (V) ?

This is why your signum output shows only x-values between -1 and 1.

Everything's ok :)

Signum function can written using simulink