If you are looking on how to save multiple variables and values within a 'for' loop then find below a simple MATLAB script code that will aid your learning
r=[]
for x = [10:2:20]
for y = [1200:10:1250]
z = x*y
r = [r;x y z]
end
end
r=[]
for x = [10:2:20]
for y = [1200:10:1250]
z = x*y
r = [r;x y z]
end
end