Loads prices from blockchain.info's CSV of market prices.

load_prices.m

function [ dates, prices, changes ] = load_prices( filename )
    % LOAD_PRICES Loads prices from a blockchain.info market-price.txt
    % Loads prices from the CSV file provided by blockchain.info at
    % http://blockchain.info/charts/market-price

    fid = fopen( filename );
    raw = textscan( fid, '%s %f', 'delimiter', ',' );
    fclose( fid );
    
    dates   = raw{1};
    prices  = raw{2};
    changes = zeros( length( dates ), 1 );
    
    changes(1) = 1;
    for i = 2:length(prices)
        changes(i) = prices(i)/prices(i-1);
    end
end