block Abs "Output the absolute value of the input"
extends Interfaces.SISO;
parameter Boolean generateEvent = false "Choose whether events shall be generated"
annotation (Evaluate = true);
equation
y = if generateEvent then if 0 <= u then u else -u else if noEvent(0 <= u) then u else -u;
annotation (
defaultComponentName = "abs1",
Icon(
coordinateSystem(
preserveAspectRatio = true,
extent = {
{-100, -100},
{100, 100}}),
graphics = {
Polygon(
points = {
{92, 0},
{70, 8},
{70, -8},
{92, 0}},
lineColor = {192, 192, 192},
fillColor = {192, 192, 192},
fillPattern = FillPattern.Solid),
Line(points = {
{-80, 80},
{0, 0},
{80, 80}}),
Line(
points = {
{0, -14},
{0, 68}},
color = {192, 192, 192}),
Polygon(
points = {
{0, 90},
{-8, 68},
{8, 68},
{0, 90}},
lineColor = {192, 192, 192},
fillColor = {192, 192, 192},
fillPattern = FillPattern.Solid),
Text(
extent = {
{-34, -28},
{38, -76}},
textColor = {192, 192, 192},
textString = "abs"),
Line(
points = {
{-88, 0},
{76, 0}},
color = {192, 192, 192})}),
Documentation(info = "<html>\n<p>\nThis blocks computes the output <strong>y</strong>\nas <em>absolute value</em> of the input <strong>u</strong>:\n</p>\n<blockquote><pre>\ny = <strong>abs</strong>( u );\n</pre></blockquote>\n<p>\nThe Boolean parameter generateEvent decides whether Events are generated at zero crossing (Modelica specification before 3) or not.\n</p>\n</html>"));
end Abs;