How to limit function output range?

Question

Jeremy2022 2022-8-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1788545-how-to-limit-function-output-range

回答： Matt J 2022-8-28

Say I wan to create a sine wave between -4 to 4, all other values outside -4 and 4 will be zero.j

Here's the code that I thought it was going to work, but I am getting incorrect dimension, is there another way to achieve what I want to achieve?

t = [-10:0.1:10]
t = 1×201
  -10.0000   -9.9000   -9.8000   -9.7000   -9.6000   -9.5000   -9.4000   -9.3000   -9.2000   -9.1000   -9.0000   -8.9000   -8.8000   -8.7000   -8.6000   -8.5000   -8.4000   -8.3000   -8.2000   -8.1000   -8.0000   -7.9000   -7.8000   -7.7000   -7.6000   -7.5000   -7.4000   -7.3000   -7.2000   -7.1000
u1 = @(t) t>=4;
u2 = @(t) t<=4;
u3 = @(t) (u1(t) * u2(t));
x1 = @(t) ((10 * sin(pi*t/4)) * u3(t));
plot(t, x1(t));
Error using *
Incorrect dimensions for matrix multiplication. Check that the number of columns in the first matrix matches the number of rows in the second matrix. To operate on each element of the matrix
individually, use TIMES (.*) for elementwise multiplication.

Error in solution (line 4)
u3 = @(t) (u1(t) * u2(t));

Error in solution (line 5)
x1 = @(t) ((10 * sin(pi*t/4)) * u3(t));
plot(t, x1(-(t+2)/2));