Plotting a piecewise returns error

Hello,

Plotting the code below returns the following erro:

syms t 
t =[0:0.1:2*pi];
x = 2*sin(t);
%% Plot 1 
figure (1)
f_1 = piecewise(t < -1, 1.5*2*sin(t)+1.5, -1 < t < 1, 0,t>1, 1.5*2*sin(t)-1.5);
plot(f_1, t);

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

Please help, thank you

Answer 1

[Walter Roberson]

t =[0:0.1:2*pi];

delete that line

plot(f_1, t);

instead

fplot(f_1, [0, 2*pi])