How can I create a piecewise inline function in MATLAB?

Question

I have a function in MATLAB which takes another function as an argument. I would like to somehow define a piecewise inline function that can be passed in. Is this somehow po

Answer 1

I just had to solve that problem, and I think the easiest thing to do is use anonymous functions. Say that you have a piecewise function:

when x<0    : x^2 + 3x
when 0<=x<=4: e^x
when x>4    : log(x)

I'd first define logical masks for each piecewise region:

PIECE1 = @(x) x<0
PIECE2 = @(x) x>=0 & x<=4
PIECE3 = @(x) x>4

Then I'd put them all together:

f = @(x) PIECE1(x).*(x.^2+3*x) + PIECE2(x).*exp(x) + PIECE3(x).*log(x)

x = -10:.1:10
figure;
plot(x,f(x))