how to reduce forloops and run time??

for rr = 1:25

for mm = 1:150

for nn = 1:300

[~,idx] = min(abs(var1(:,1) - tof(mm,nn,rr)));

voltage(mm,nn,rr) = bscan(idx,rr);

end

end

end

[Stephen23]

https://www.mathworks.com/help/matlab/matlab_prog/techniques-for-improving-performance.html