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How to flip the Y-axis of the square wave

Hello Everyone,
I want to reverse my square wave, I mean the x-axis should same but only amplitude is reverse, when the original waveform is at a high level then reverse waveform is at a low level and vice versa. 

 

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Use negate (-x)

 

1.PNG2.PNG

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Dear Member,
Thank you so much for your response, I got your answer, but I have 0 to 5 Volt amplitude square wave and I want to flip my Y axis such as within o to 5 volt but states should be changed from HIGH to LOW and LOW to HIGH.

Thanks

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