I have a syntax error with Fcn

I want to give a formula is sign(u(2)-u(3)) into Fcn, but I got a message is

The expression: sign(u(2)-u(3))

in 'hebonnuoc/He bon nuoc /h1dot'

has a syntax error

Answer 1

[Ameer Hamza]

The documentation page shows that you should use sgn instead of sign: https://www.mathworks.com/help/simulink/ref_obsolete_blocks/fcn.html

sgn(u(2)-u(3))

Also, this block is obsolete; consider using a better alternative: https://www.mathworks.com/help/simulink/slref/matlabfunction.html

[Quy Long Vu]

Thank you so much. I got it

[Ameer Hamza]

I am glad to be of help!!!

Answer 2

[Fangjun Jiang]

Use "sgn" instead of "sign". It is in the document. Click "Help" after double click the block.