How to create this fucntion below

I`m very new to matlab and don`t know how to create below function

first, I have made function

fx.m

function result = fx(t)

if -1<=t & t

    result = 1;

elseif t>=0 & t

    result = -1;

else

    result = 0;

end

in console space

t=linspace(0,1);

x=fx(t)

and the compiler said x=0 and that`s it

how to deal with this?

[Walter Roberson]

That diagram requires that at t = 0, f(t) is all of the values between -2 and +2 simultaneously. Even if you restrict yourself to numbers that are representable in IEEE 754 double precision, I figure that is 9223372036854775804 different numbers that would have to be returned at f(0) . This is not in any way practical.

Answer 1

[Birdman]

You can try the Symbolic approach:

syms y(t)
y(t)=piecewise(t<-1,0,t>=-1 & t<0,2,t>=0 & t<=1,-2,t>1,0);
%plotting
t=-5:0.001:5;
plot(t,y(t))

Answer 2

[Tommy]

If you want fx to return an array the same size as t:

function result = fx(t)
    result = zeros(size(t)); % f(t) is mostly 0
    result(-1<=t & t<0) = 2; % except when t is between -1 and 0, in which case it's 2
    result(t>=0 & t<1) = -2; % and when t is between 0 and 1, in which case it's -2
end

Then,

t = linspace(-1.5, 1.5);
x = fx(t);
plot(t, x)