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title plot can't be shown + grid

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Faisal Al-Wazir
Faisal Al-Wazir 2022-10-28
回答： Star Strider 2022-10-28
Ran in:
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])

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采纳的回答

Star Strider
Star Strider 2022-10-28
Ran in:
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])
.

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