How can I plot this discrete recursive function?

조회 수: 17 (최근 30일)
Mike AA
Mike AA 2020년 3월 4일
댓글: Mike AA 2020년 3월 4일
I wrote a discrete recursive function to model logistic growth. The sole input argument to this function is time. If I pass a single value for time, it will plot it just fine, but if I pass an array of numbers, it will give the following error:
Maximum recursion limit of 500 reached. Use set(0,'RecursionLimit',N) to change the limit. Be aware that exceeding
your available stack space can crash MATLAB and/or your computer.
Here's the function code:
function [ pop] = discrete_logistic( time )
r = 1;
K = 1000;
N0 = 0.1;
if time ==0
pop = N0;
else
pop = discrete_logistic(time-1) + r*discrete_logistic(time-1)*(1-discrete_logistic(time-1)/K);
end
And here's the script which passes time as input:
clear all;
close all;
clc;
t = [1:10];
w = discrete_logistic(t);
plot(t,w,'r*');
shg
I've tried different ways for passing time,

채택된 답변

KALYAN ACHARJYA
KALYAN ACHARJYA 2020년 3월 4일
편집: KALYAN ACHARJYA 2020년 3월 4일
function pop=discrete_logistic(time)
r = 1;
K = 1000;
N0 = 0.1;
if time==0
pop=N0;
else
pop=discrete_logistic(time-1)+r*discrete_logistic(time-1)*(1-discrete_logistic(time-1)/K);
end
Main:
t = [1:10];
for i=1:length(t)
w(i)= discrete_logistic(t(i));
end
plot(t,w,'r*');
shg
  댓글 수: 3
KALYAN ACHARJYA
KALYAN ACHARJYA 2020년 3월 4일
It definitely accept the array of data, but what about pop output in the function file.
Mike AA
Mike AA 2020년 3월 4일
If a function accepts an array, the output will be an array too, no? Or do I have to define the output seperately inside the function?

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