Programmer Guide/Command Reference/EVAL/rpoly: Difference between revisions

Latest revision as of 09:41, 15 May 2023

Evaluate polynom with real coefficients.

Usage

rpoly(a, x):

Result

The result y has the same type as x.

y[i,j] = a[0] + a[1]*x[i,j] + a[2]*x[i,j]^2 + ... + a[m]*x[i,j]^m

with: m = polynom order = ncol(a)-1

@@ Line 1: / Line 1: @@
 {{DISPLAYTITLE:{{SUBPAGENAME}}}}
-=====rpoly=====
+Evaluate polynom with real coefficients.
+;Usage: <code>rpoly(<var>a</var>, <var>x</var>)</code>:
+:;<var>a</var>: a vector containing the polynom coefficients
+:;<var>x</var>: a scalar, vector or matrix
+;Result: The result ''y'' has the same type as ''x''.
+::<code>''y''[i,j] = ''a''[0] + ''a''[1]*''x''[i,j] + ''a''[2]*''x''[i,j]^2 + ... + ''a''[m]*''x''[i,j]^m</code>
+::<code>with: m = polynom order = ncol(''a'')-1</code>
+;See also: [[../rpolyreg|rpolyreg]], [[../interp|interp]]
-Evaluate the polynomial <var>a</var> for all arguments.
+[[../#Functions|<function list>]]
-=====Usage:=====
-<code>rpoly(<var>a</var>, <var>x</var>)</code>
-=====Parameters:=====
-;<var>x</var>
-:A number, vector or matrix.
-=====Result:=====
-<code>y[] = a[0] + a[1]*x[] + a[2]*x[]^2 ...</code>
-=====Return Type:=====
-The same as <var>x</var>.