Creating a Weekly Average of Power Demand Data

Hi, I am working on a script that takes hourly power demand loading data. I currently import the system total data into "dataB" vector. I am looking at creating a plot for the average week of the system for analysis. With this I am trying to create a new vector ("Sum") to list the average value for each of the 168 hours in a week. I tried to loop through dataB adding the values together, then averaging this by the 52 weeks in a year. The dataB gets imported fine, as per my import script, but the sum vector remains a 168x1 vector that contains all zeros. Please see below for the loop script I am using now. Any help would be appreciated. Thanks.

[Time,dataB,dataC,dataD,dataE,dataF,dataG] = importfile(filename);

sum = zeros(168,1);
Sys_Avg = zeros(168,1);

for i= 0:51;
        for j = 1:168;
{
{
           sum(j, 1) == sum(j, 1) + dataB(j+(i*j), 1);    
           }
           }
       end
end

for i = 1:168;
    {
Sys_Avg(i, 1) == sum(i,1)/52;
}
end

[dpb]

Matlab is not C -- you don't enclose clauses in for or if constructs in braces. They indicate a cell array, NOT what you're wanting here...