Can anyone simplify this code please?
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Morning all,
I have a problem. I'm trying to take a subset of a matrix, but not a uniform distribution. The difference between points is given in the vector phi, which I've made super long to make sure I don't reach the end of it, As you can see this vector is a 6 number repeating pattern. I've made a vector, zeta, containing the rows I would like to extract from the matrix. But, it is super clunky! Is anyone able to simplify this code for me please? I'm sure it should be possible without the loop.
phi = repmat([8.70;8.70;8.70;8.70;8.70;16.59],10,1);
% Random number generator to decide which sensor to use first
sensor = randi(6,1);
col = 1;
zeta = 1;
while col + round(phi(sensor),0) < 153
col = col + round(phi(sensor),0);
zeta = [zeta; col];
sensor = sensor + 1;
end
Many thanks
5 个评论
jlt199
2016-9-13
John D'Errico
2016-9-13
Why? Does it take too long to run? pre-optimizing code that has no reason to be optimized is a huge waste of time.
jlt199
2016-9-13
jlt199
2016-9-13
jlt199
2016-9-14
采纳的回答
TallBrian
2016-9-14
I am not sure exactly what you mean by simplify but here is some code which eliminates the looping.
LENGTH = 153;
phi = round([8.70; 8.70; 8.70; 8.70; 8.70; 16.59]);
max_reps = round(LENGTH / sum(phi)) + 1;
phi_complete = repmat(phi, max_reps, 1);
phi_offset = [1; phi_complete(randi(6,1):end)];
zeta = cumsum(phi_offset);
zeta = zeta(zeta < LENGTH);
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