Evaluate polynomial expression
The Polynomial Evaluation block applies a polynomial function to the real or complex input at the In port.
y = polyval(u) % Equivalent MATLAB code
When you select the Use constant coefficients check box, you specify the polynomial expression in the Constant coefficients parameter. When you do not select Use constant coefficients, a variable polynomial expression is specified by the input to the Coeffs port. In both cases, the polynomial is specified as a vector of real or complex coefficients in order of descending exponents.
The table below shows some examples of the block's operation for various coefficient vectors.
|Coefficient Vector||Equivalent Polynomial Expression|
|[1 2 3 4 5]|
|[1 0 3 0 5]|
|[1 2+i 3 4-3i 5i]|
Each element of a vector or matrix input to the In port is processed independently, and the output size is the same as the input.
Select to enable the Constant coefficients parameter and disable the Coeffs input port.
Specify the vector of polynomial coefficients to apply to the input, in order of descending exponents. This parameter is enabled when you select the Use constant coefficients check box.