MATLAB: Sum

Question

i have an array whose size is 467*320 = 149440 i mean,

Y = [y1 y2 … y149440] and i'd like to do that :

Y_1 =[y1+y2+y3…+y320 y321+y322+y321+…y640 …..]

y11=y1+y2+…+y320

y12=y321+y322…+y640

:

:

that is to say; the first element of Y_1 is sum of the first 320 elements and the second element of that is sum of the second 320 elements and going on like this and the size of Y_1 will be 1×467(1×149440/320)…

And i will have Y_2 like Y_1

for Y_2 : Y_2=[y1+y2+y3+…+y320 ….. …. ](1×467)

y21=y1+y2+y3+…+y320

:

:

at the end i create X-array that is

X = [y11+y21 y12+y22 y13+y23 ……]

this is my question 🙂

i thank you for your helps…

Answer 1

I am a little confused, do you mean like this:

Y = reshape(1:18,6,3)  % A manageable dimension.
Y_1 = sum(Y,2)

So in your case it would be

Y_1 = sum(Y,2).';

.

.

Or do you mean, more like this:

Y = 1:18
Y_1 = sum(reshape(Y,3,6))

So in your case it would be

Y_1 = sum(reshape(Y,320,467))