What is this block?

2013 12 13
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kei hin
kei hin 2013-12-13
编辑：kei hin 2013-12-13

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Sign->Indicate sign of input.
  • The output is 1 when the input is greater than zero.
  • The output is 0 when the input is equal to zero.
  • The output is -1 when the input is less than zero.
http://www.mathworks.com/help/simulink/slref/sign.html
Your block is reversed. You can press the right key on it to see the help.

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