S.O.S. Mathematics CyberBoard

The question is : Suppose you want to know how often a single source of fungus will spread more than one foot from a fallen tree. You will be using a computer simulation to answer this question based on the random walk model of the tree fungus in the textbook.

this is code using matlab tha'ts given in the text

Subroutine:

function [y,concen]=fungi(n,t)
%n - number of fungi
%t- number of steps
%y - max distances in each step
%concen - density of points at given distance

m1(1,1:n)=1:n;
m2(1,1:n)=(1:n)*0
y(1)=0
for i=1:t
alfa=rand(1,n)*pi;
d=rand(1,n);
m1(i+1, 1:n)=m1(i, 1:n)+(d.*cos(alfa));
m2(i+1, 1:n)=m2(i, 1:n)+(d.*sin(alfa));
if any(m2(i+1,:)<0);
xx=find(m2(i+1,:)<0);
for j=1 :length(xx)
m2(i+1, xx(j))=-m2(i+1), xx(j));
end;
end;
y(i+1)=max(max(m2(i+1,:)),y(i));
end;
maxy=y(t+1);
deltay=maxy/(2*t);
pop=n;
pointotal=sum(sum(m2(1:t+1,:)<=maxy)));
%pointotal - all points
ilosc(1)=n/pointotal;
for i-1:2*t
total = sum(sum(m2(1:t+1,:)<=((i/(2*t))*maxy)));
concen(i+1)=total-pop;
concen(i+1)=concen(i+1)/pointotal;
pop=total;
end;
subplot(2,1,1);
plot([1,n],[0,0],'k','LineWidth',2);
%hold on
for i=1:length(m1(1,:))
plot(m1(:,i),m2(:,i),'-*','Color',[rand(1),rand(1),rand(1)]);
%hold on
end;
xlabel('X');
ylabel('Y');
subplot(2,1,2);
plot([0:deltay:maxy],concen);
xlabel('distance');
ylabel('density');
%hold off
pause(0.01);

Driver statements:
function y=calcul(n,t)
for j=1:t
for i=1:100
[yy,i]=fungi(n,j);
point(i)=yy(j+1);
end;
y(j)=sum(point)/100;
end;



As soon as i type function [y,concen]=fungi(n,t) it gives me this error:??? function [y,concen]=fungi(n,t)
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Error: Function definitions are not permitted in this context.

I do not do any computer programming so i need some help on how to start this. Our teacher kinds just threw this at us. What valuse should n,t,y and concen be?

[y,concen] are the values that will be returned to you after the calculations are complete. You need to input the parameters "n" and "t" only so you will call it by "fungi(n,t)". as for the values of "n" and "t" to input that is up to you but this should stop giving you that error.