why stepseq error in matlab 2022a

clc;

close all;

clear;

t=-1:1;

a = sin(2*pi*t);

b = stepseq(-1, -1, 1)-stepseq(1, -1, 1);

h = a.*b;

subplot(2,1,2);

title('5-19_d');xlabel('t');ylabel('x[t]');

Answer 1

[Walter Roberson]

stepseq is not a function provided by Mathworks. See https://www.mathworks.com/matlabcentral/answers/12834-unsolved-function for the code.