Storing calculations into a list

[Tone L]

I have a code that loops through and does some computation on 5 random values from my lists of data (2187 rows long).

for i = 1:3
randomdata = round(rand(5,1).*2187);

xval = x(randomdata)
yval = y(randomdata)
numerator = length(xval).*nansum(xval.*yval) - (nansum(xval).*nansum(yval))
end

my output on the screen is as follows: 5 random values stored in xval & yval
xval =
3.3
3.2
6.4
4.3
1.2

yval =
13
33
83
42
9

numerator =
-.34
numerator =
-.12
numerator =
-.45
My question is why isn't numerator being stored as a 5x1 array like xval and yval??

 

[DrClaude]

My question is why isn't numerator being stored as a 5x1 array like xval and yval??

Because nansum of a 5x1 array returns a scalar.