How to fix this error " Search term must be a string array, character vector, or cell array of character vectors", I got this error when I used N = count(s,t);

%For example: Generate a sample path of N(t ), a rate λ = 5 arrivals/min Poisson process. Plot N(t ) over a 10-minute interval.
.............................................
clear all;
clc;
t = 0.01*(0:1000);
lambda = 5;
N = poissonprocess(lambda,t);
plot(t,N)
xlabel('\it t');
ylabel('\it N(t)');

function N = poissonprocess(lambda,t)
%input: rate lambda>0, vector t For a sample function of a
%Poisson process of rate lambda, N(i) = no. of arrivals by t(i)

s = poissonarrivals(lambda,max(t));        %poissonarrivals returns the vector s with s(i) corresponding to Si , the
%ith arrival time.
N = count(s,t);                                         % N(t ) = max {n|Sn ≤ t}, is the number of arrivals that occur by time t
%which counts the number of elements of s that are less than or equal to t(i) 
%for each t(i).
end

function s = poissonarrivals(lambda,T)
%Arrival times s=[s(1) ... s(n)], s(n) <= T < s(n+1)
n = ceil(1.1*lambda*T);
s = cumsum(exponentialrv(lambda,n));
while (s(length(s))< T)
    s_new = s(length(s))+ ...
        cumsum(exponentialrv(lambda,n));
    s =[s; s_new];
end
s = s(s<=T);
end

function x = exponentialrv(lambda,m)
x = -(1/lambda)*log(1-rand(m,1));
end

[KSSV]

Read the documentation of count. The purpose of it is different. What you want to do here with s and t?

[Walter Roberson]

It looks to me as if you are missing your own function named count

[Abdullah Ghaleb]

In this fucntion [N=count(s,t)], I would like to count the number of elements of s that are less than or equal to t(i) for each t(i).

[Walter Roberson]

okay, go ahead and write that code.

[Walter Roberson]

hint: make s a column vector and t a row vector, and use <= between those, and sum() along the first dimension

[Abdullah Ghaleb]

Got that, thank you.