In the general case:
xvals = [list of x values, does not have to be regularly spaced or even sorted];
numx = length(xvals);
y = zeros(1,numx); %pre-allocate
for xidx = 1 : numx
x = xvals(xidx);
thisy = some calculation involving x
y(xidx) = thisy;
end
In the special case where x is integers increasing by 1, but not necessarily starting from 1:
firstx = value
lastx = value
numx = lastx - firstx + 1;
y = zeros(1, numx); %pre-allocate
for x = firstx : lastx
thisy = some calculation involving x
y(x - firstx + 1) = thisy;
end
In the special case where x is integers starting from 1 and increasing by 1:
y = zeros(1, lastx); %pre-allocate
for x = 1 : lastx
thisy = some calculation involving x
y(x) = thisy;
end
It would be common that the expression is simple enough that it is clear to put the body into one line:
y = zeros(1, lastx); %pre-allocate
for x = 1 : lastx
y(x) = some calculation involving x
end
pre-allocation is not strictly necessary, but it can make a fairly noticable difference in performance.
