Buildings.Fluids.Utilities.BaseClasses

Package Content

Name	Description
der_extendedPolynomial	Polynomial that is linearly extended at user specified values

Buildings.Fluids.Utilities.BaseClasses.der_extendedPolynomial

Information

This function is the derivative of extendedPolynomial with respect to x.

Inputs

Type	Name	Default	Description
Real	c[:]		Polynomial coefficients
Real	x		x value
Real	xMin		Minimum x value for polynomial
Real	xMax		Maximum x value for polynomial
Real	der_x

Outputs

Type	Name	Description
Real	der_y	Derivative dy/dx

Modelica definition

function der_extendedPolynomial 
  "Polynomial that is linearly extended at user specified values" 
  extends Modelica.Icons.Function;
  input Real[:] c "Polynomial coefficients";
  input Real x "x value";
  input Real xMin "Minimum x value for polynomial";
  input Real xMax "Maximum x value for polynomial";
  input Real der_x;
  output Real der_y "Derivative dy/dx";
protected 
 Integer N = size(c,1) "Number of coefficients";
algorithm 
if x < xMin then
   der_y := 0;
   for i in 2:N loop
     der_y := der_y + (i - 1)*xMin^(i - 2)*c[i];
   end for;
  elseif x < xMax then
   der_y := 0;
   for i in 2:N loop
     der_y := der_y + (i - 1)*x^(i - 2)*c[i];
  end for;
  else
     der_y := 0;
     for i in 2:N loop
       der_y := der_y + (i - 1)*xMax^(i - 2)*c[i];
    end for;
  end if;
end der_extendedPolynomial;