Error when using Max command in a function

When creating a function that performs a Monte-Carlo simulation I have to find the maximum value in an array, but when I try this I get an error code that says: Error using max Invalid data type. First argument must be numeric or logical.

Here is my function:

function [ integral_approx ] = montecarlosim( a,b,y,n )

x=[a,b];
r=max(y);
v=(max(x)-min(x)).*rand(n,1)+min(x);
w=(r).*rand(n,1);
x=v;
i=find((w>=0)&(w<=y));
m=numel(i);
(m/n)*r*(b-a)

end

[the cyclist]

Your function executes to completion for me, for a variety of inputs. For example

montecarlosim(1,2,3,4)

executes for me.

How are you calling this function?

[James Tursa]

How are you calling this function? What are the data types and sizes of the variables?

Answer 1

[Wonsang You]

Your function has no logical problem. Please make sure your argument y should be a numerical vector not logical.