title plot can't be shown + grid

i'm trying to plot unit step function but i can't use the title function and grid for some reason

clc
clear
u = @(t) double(t>=0);
h = @(t) u(t+1)*(t+1)-u(t)*(3/2)*(t)+u(t-2)*0.5*(t-2);
p=  @(t) h(2*t)

p = function_handle with value:
    @(t)h(2*t)

p1=  @(t) h(0.5*t)

p1 = function_handle with value:
    @(t)h(0.5*t)

p2=  @(t) h(t-1)

p2 = function_handle with value:
    @(t)h(t-1)

p3=  @(t) h(2-t*0.5)

p3 = function_handle with value:
    @(t)h(2-t*0.5)

subplot(2,3,1)
grid on
title('x')
fplot(h,[-5,5])

Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input arguments.

ylim([-2 4])
subplot(2,3,1)
fplot(h,[-5,5])

Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input arguments.

ylim([-2 4])

subplot(2,3,2)
title('x')
fplot(p,[-5,5])

Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input arguments.

ylim([-2 4])

subplot(2,3,3)
title('x')
fplot(p1,[-5,5])

Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input arguments.

ylim([-2 4])

subplot(2,3,4)
title('x')
fplot(p2,[-5,5])

Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input arguments.

ylim([-2 4])

subplot(2,3,5)
title('x')
fplot(p3,[-5,5])

Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input arguments.

ylim([-2 4])

Answer 1

[Star Strider]

The title and grid functions do not apply until the axes are created. Also, there are two ‘subplot(2,3,1)’ creations, the second overwrites the first. (I added the subplot numbers to the title calls for clarity. Edit those out those later.)

Try this —

% clc
% clear
u = @(t) double(t>=0);
h = @(t) u(t+1).*(t+1)-u(t).*(3/2).*(t)+u(t-2).*0.5.*(t-2);
p=  @(t) h(2*t);
p1=  @(t) h(0.5*t);
p2=  @(t) h(t-1);
p3=  @(t) h(2-t*0.5);

figure
subplot(2,3,1)
fplot(h,[-5,5])
grid
title('x 231')
ylim([-2 4])

% subplot(2,3,1)
% fplot(h,[-5,5])
% ylim([-2 4])

subplot(2,3,2)
fplot(p,[-5,5])
title('x 232')
ylim([-2 4])

subplot(2,3,3)
fplot(p1,[-5,5])
title('x 233')
ylim([-2 4])

subplot(2,3,4)
fplot(p2,[-5,5])
title('x 234')
ylim([-2 4])

subplot(2,3,5)
fplot(p3,[-5,5])
title('x 235')
ylim([-2 4])

.