MATLAB: How to make a for loop that goes from -10 : 10

Question

Here are two options for what to do right now….im not sure if either of these are correct or if there is a better way to do it.

for x = range(-10:10)

       for y = range(-10:10)
              (code goes here)
  end
  end

or

for x = -10: 1: 10
     for y = -10: 1: 10
           (code)
end
end

Answer 1

MATLAB does not use range() . Your second version is correct.

However, you will probably want to store the results of each iteration. In this case you would have to store into Output(X+11, Y+11) . In the more general case where you might not be incrementing by 1, you should learn a different pattern:

xvals = -10:.12345:10;   %your increments might not be integer so it might be difficult to compute indices
nx = length(xvals);
yvals = randn(size(xvals));  %you might not have any fixed increment at all, might not be ordered
ny = length(yvals);
Output = zeros(nx, ny);
for xidx = 1 : nx
  x = xvals(xidx);
  for yidx = 1 : ny
    y = yvals(yidx);
    ...
    Output(xidx, yidx) = ...
  end
end

with this general pattern, the values to be processed do not have to be consecutive or even ordered, but this code will handle all of the combinations.