I have a function intended to do some initial calculations on an array of test data collected during mechanical fatigue tests run under cyclic load control. It's formatted in 3 columns of time, position and load (each row is a single measurement) The datasets are huge... sometimes 20 million rows or more. Can anyone think of good ways to vectorize these FOR loops? The 2nd loop is especially inefficient, but I'm new to coding with vectors and am having trouble wrapping my head around it.
Thanks for any help or resources you can provide!
function [test,cycleposition] = fatigueimport(test)
cycle = zeros(length(test),1);
cyclecount=1;
cycle(1)=1;
changeload = diff(test(:,3));
count = length(test)-1
for i=2:count
if and(changeload(i-1)>0,changeload(i)<0)
cyclecount=cyclecount+1
end
cycle(i)=cyclecount;
i=i+1;
end
test = [test,cycle];
count = max(test(:,4))
cycleposition = zeros(count,1);
for i=1:count
cycleposition(i)=min(test(test(:,4)==i,2));
i=i+1;
end
end
