Matlab plotting?

I'm not 100% sure what you are saying, but I believe you problem is in the if statement as shown below. Specifically, you can never enter the first clause unless y=.5, which is unlikely. I suspect you wanted abs(y) Secondly, your two plots don't match each other, the first plots complex numbers, and the second x and y values.

That just doesn't seem right, but I'm not certain what you are trying to do, so I don't know how to fix it.

The problem was that the Y should be in this range : if ( y > 0.5 | y 0.5 | y.

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