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how i can vectorize this code using bsxfun or meshgrid?

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ttopal
ttopal 2017-3-14
编辑： ttopal 2017-3-16
Hi,
I am trying to vectorize this code, but I dont know how to start it, I read the help files for both bsxfun and meshgrid but no luck. Can someone please guide how to look at this rather than giving the code. My code is working for me but i want to improve it.
s1= 50;
s2=100;
E_=zeros(s2,s2);
grid_=linspace(-2.5,2.5,s2);
tau=linspace(-pi,pi,s1);
x=cos(tau);
y=sin(tau);
cur=myfun(x,y); %returns vector
for k=1:s2
for m=1:s2
for n=1:s1
R= abs(sqrt((grid_(m)-x(n))^2+(grid_(k)-y(n))^2));
u_(n)= besselj(0,R)*cur(n);
end
E_(k,m)=abs(trapz(tau,u_));
end
end
Thanks
Turker

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采纳的回答

Jan
Jan 2017-3-14
编辑：Jan 2017-3-15
You can replace the inner loop by:
R = abs(sqrt((grid_(m)-x) .^ 2 + (grid_(k)-y) .^ 2)); % [EDITED]: ^ to .^
u_ = besselj(0, R) .* cur;
I guess, that the abs() is not required.
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ttopal
ttopal 2017-3-16
Hi Jan, it returns error as;
Assignment has more non-singleton rhs dimensions than
non-singleton subscripts
Error in testfields (line 121)
E_(k,m)=abs(trapz(tau,u_));
ttopal
ttopal 2017-3-16
编辑：ttopal 2017-3-16
R = abs(sqrt((grid_(m)-x) .^ 2 + (grid_(k)-y) .^ 2))'; %transpoze added.
u_ = besselj(0, R) .* cur;
Now it works! Thank you Jan!

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