two dimensional for loop - "matrix dimensions must agree"

Receiving this error when running Matrix dimensions must agree.

Error in untitled (line 34)
    Dp2p(i, j)= ( (N.*F) ./ (Us + u) )

%% ECE440 HW4

clc
clear all

%%Building matrixes 

syms N F U dmin Ui Us 

F = 18*10^9 ;%bites 
dmin= 2*10^6 ;%download rate
Us= 30*10^6 ;%upload rate

%%Solving  

N = [1000, 10,000, 100,000];
u = [350*10^3, 700*10^3, 2*10^6]; 

%%Client Server

for (i=N)  ;
    Dcs1= (N*F)/ Us;
    Dcs2= F/ dmin;
end;

%%P2P Server 

for i=1:length(N) 
    for j=1:length(u)
    Dp2p(i, j)= ( (N.*F) ./ (Us + u) ) 
    end
end

Answer 1

[Massimo Zanetti]

Do not use commas to separate decimals as in

N = [1000, 10,000, 100,000];

In matlab commas are only to separate between array elements, in rows.Fix by putting:

N = [1000, 10000, 100000];

[Ryan Vacek]

thanks must appreciated