Large Cell Array Manipulation?
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I have a nx3 matrix in the from:
P=
x1 y1 z1
x2 y2 z2
. . .
. . .
. . .
xn yn zn
I have then used the rangesearch() function to find the points within a radius of 4 of each point in turn:
N=rangesearch(P,P,4)
Each cell in N gives the row numbers of these positions which is within the range.
How can I then manipulate N to contain the x,y,z positions of these points?
I have achieved this using:
for n=1:Natoms
N{n}=P(N{n});
end
however for large n the loop is very time consuming, is there a faster way or a preexisting function?
回答（2 个）
The loop is probably not the limiting factor. RANGESEARCH will be much slower than the loop, for almost any number of atoms. Try it in the profiler, type:
profile viewer
in the command window, type the name of your script in the field labeled "Run this code", click on [Start profiling], and you will see the report.
PS: you probably want
M{n} = P(N{n}, :); % or N if you update it instead of creating a new cell array.
in your loop.
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