MATLAB: Does poly() not evalp

mupad evalp poly

I have an example:
    evalp( poly( sqrt( 1-x^2 ), [x] ), x=cos(0.5) )
This gives (sqrt(1-x^2)) as the response.
The expected result is only given by
    evalp( poly( sqrt( 1-x^2 ), [x] ), x=cos(0.5) ) | x=cos(0.5)
And evalp works as expected with simple expression like
    evalp( poly( x, [x] ), x = 1 )
Is this a bug?

Best Answer

sqrt( 1-x^2 ) is not a polynomial. evalp() is only for evaluating polynomials.
I am not familiar with the way you used "|" in your second expression. I looked through the Standard Library but I do not find any meaning defined for "|" . Could you give a reference on that?
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