Stephen Morris

Hi, i used this program to solve my equations but i couldn't get the roots. Could you please help me to identify any mistakes that i have made? Thank you in advance.

JRa= @(y) besselj(1,y);
JR1a= @(y) besselj(0, y) - besselj(1, y)./y;

JRb= @(y) besselj(1,z);
JR1b= @(y) besselj(0, z) - besselj(1, z)./z;

Yb= @(y) bessely(1,z);
Y1b= @(y) bessely(0, z) - bessely(1, z)./z;

Ya= @(y) bessely(1,y);
Y1a= @(y) bessely(0, y) - bessely(1, y)./y;

r=@(y) y.*((JR1a.*Y1b-JR1b.*Y1a)./(JRa.*Y1b-JR1b.*Ya));
u=FindRealRoots(r,0,10,10)

The errors are as follows:
??? Undefined function or method 'times' for input arguments of type 'function_handle'.

Error in ==> @(y)y.*((JR1a.*Y1b-JR1b.*Y1a)./(JRa.*Y1b-JR1b.*Ya))

Error in ==> FindRealRoots>chebft at 73
            f(k)=funhandle((y*bma)+bpa); % depend on funhandle being a

Error in ==> FindRealRoots at 14
c=chebft(funhandle,a,b,n);