# How to add a step size of 2

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Tony Hill on 27 Apr 2014
Commented: Image Analyst on 28 Apr 2014
Ok so i have a function to write and it is supposed to calculate and return the product of 1 to n in a step size of 2.
for n = 1:2
inv(1*3*5*7);
end
How do i make this a step size of two? Do i do for n = 1:n:2?
Star Strider on 27 Apr 2014
You’re getting there.
From the documentation:
Using two colons to create a vector with arbitrary real increments between the elements,
E = 0:.1:.5
results in
E =
0 0.1000 0.2000 0.3000 0.4000 0.5000

Geoff Hayes on 27 Apr 2014
Hi Tony,
Either type help for in the MATLAB command window to get information on for loop syntax, or visit the following link: for loop.
Geoff

Image Analyst on 28 Apr 2014
No for loop is needed at all. See the prod() function.
And you got the colon stuff in the wrong order. The correct order is startingValue : stepAmount : endingValue. You put the step at the end instead of the middle.
Image Analyst on 28 Apr 2014
Anyway, that problem is trivial, toddler-level stuff. Here's a far more interesting question for you:
Investigate these two different equations with different values of n:
sum1 = 1^n + 19^n + 20^n + 51^n + 57^n + 80^n + 82^n
sum2 = 2^n + 12^n + 31^n + 40^n + 69^n + 71^n + 85^n
Explain what you see and why you see it.

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