undefined function 'piecewise' for input arguments of type 'double'.

I am trying to run the following piecewise function:

x = @(y) piecewise([y>2, 1], 0)

However, whenever I try to run it, I get the following error: "undefined function 'piecewise' for input arguments of type 'double'."

I definitely have the Symbolic Math toolbox installed and am not sure why this is happening.

Answer 1

[Thiago Henrique Gomes Lobato]

piecewise defines a symbolic function, so you can't just give a double as input for the anonymous function. If you however explicitely make the substitution it will work

syms y
x = @(y) piecewise(y>2,1, 0);
subs(x,[1,2,3])

ans =
 
[ 0, 0, 1]

Although unless you really need it to be symbolic I would strongely recommend to remain working with numerical values:

x = @(y) double(y>2);
x([1,2,3])
ans =

     0     0     1