subplus - Positive part
Syntax
xp = subplus(x)
Description
xp = subplus(x) returns
, i.e., the positive
part of x, which is x if x is
nonnegative and 0 if x is negative.
In other words, xp equals max(x,0).
If x is an array, this operation is applied entry
by entry.
Examples
Example 1. Here is a plot of
the essential part of the subplus function, as generated by
x = -2:2; plot(x,subplus(x),'linew',4), axis([-2,2,-.5,2.5])
Example 2. The following anonymous
function describes the so-called hat function:
hat = @(x) subplus(x) - 2*subplus(x-1) + subplus(x-2);
i.e., the spline also given by spmak(0:2,1),
as the following plot shows.
x = -.5:.5:2.5; plot(x,hat(x),'linew',4), set(gca,'Fontsize',16)
 | stmak | | titanium |  |
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