2-4 ?陣?????

b MATLAB BL{AiHHɧܨC@ӯx}סAHeǷsơCOC@Wjx}eqɡAMATLABNnVq@~tίOA]|y{IJvCAӥByOϥΪ{H]Memory Segmentation^AإѩO骺ʺAtmӳyϥβ{HAiɭPuROAosŶHBzjx}v{HC

HWغح]AYwDϥίx}פjpAh̦nIx}wtm]Pre-allocation^AiΪO zerosBonesBcell]Ω󲧭Ȱ}Cwtm^ struct]Ω󵲺c}Cwtm^CҦpApx} x C@ӤȨñNxsx} yAا@kApUG

Example 1: 02-{XPO餧̨Τ/preAllocate01.mn = 1000000; clear y1; % Mܼ y1 tic for i = 1:n y1(i) = i^2; end time1=toc; y2 = zeros(1, n); % wtmҶx} y2 tic for i = 1:n y2(i) = i^2; end time2=toc; fprintf('time1 = %g, time2 = %g, time1/time2 = %g\n', time1, time2, time1/time2);time1 = 0.248923, time2 = 0.00902574, time1/time2 = 27.5793

bWzdҤAѩڭ̨ϥ y = zeros(1, n) ӹwtmҶx} yA]{XIJv֤F 20 hC


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