How can I optimize this code?

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Igor Arkhandeev
Igor Arkhandeev 2021 年 2 月 4 日
Good day to all! I have a snippet of code that is called very often. Since it is described through for loops, it is too slow. Are there any techniques to improve this part?
j = 1;
k = 1;
for l1 = 0:a
for m1 = -l1:l1
l2 = abs(m1);
if(l2 <= b)
for l2 = abs(m1):b
n = l2 * (l2 + 1) + m1 + 1;
d(j) = d(j) + G(k) * t(n);
k = k + 1;
end
else
k = k + 1;
end
if (l2 <= c)
k = k + c - l2;
end
j = j + 1;
end
end

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