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apollosun9283金蟲 (小有名氣)
劍橋公爵
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[求助]
MATLAB一個(gè)數(shù)值積分的問題
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待求參數(shù)an如附件中的公式所示，θ∈[0,2π]，由于公式中的D(θ)是以區(qū)間[0,2π]上均勻的離散的144個(gè)點(diǎn)的形式給出的： D=[2.524,2.522,2.518,2.512,2.504,2.495,2.484,2.472,2.459,2.444,2.427,2.41,2.391,2.372,... 2.351,2.329,2.305,2.281,2.256,2.229,2.201,2.172,2.142,2.111,2.079,... 2.046,2.011,1.975,1.938,1.9,1.86,1.82,1.778,1.735,1.69,1.645,1.598,... 1.55,1.501,1.451,1.399,1.347,1.294,1.239,1.184,1.129,1.072,1.015,... 0.958,0.901,0.844,0.786,0.729,0.673,0.618,0.563,0.51,0.459,0.409,... 0.361,0.315,0.272,0.231,0.193,0.158,0.127,0.098,0.074,0.052,0.034,... 0.02,0.01,0.003,0,0,0.004,0.012,0.023,0.037,0.054,0.074,0.097,0.123,... 0.152,0.183,0.216,0.251,0.289,0.328,0.369,0.412,0.456,0.501,0.548,... 0.596,0.645,0.694,0.745,0.797,0.849,0.901,0.954,1.008,1.062,1.116,... 1.17,1.225,1.279,1.334,1.388,1.442,1.496,1.55,1.603,1.655,1.707,1.758,... 1.808,1.858,1.906,1.953,1.999,2.043,2.086,2.127,2.167,2.205,2.241,... 2.275,2.307,2.337,2.365,2.391,2.414,2.435,2.454,2.471,2.485,2.497,... 2.507,2.515,2.52,2.524,2.525]; 所以只能求得數(shù)值積分。 我的求解程序如下： b=linspace(0,2*pi,144); for n=1:300 for i=1:144 c(i)=D(i)*cos(n*(i-1)*2*pi/143); end a(n)=1/pi*trapz(b,c) end 請(qǐng)問我這個(gè)程序?qū)幔咳绻粚?duì)，求正確的！ 請(qǐng)大家?guī)蛶兔�，在輸入原始�?shù)據(jù)D的時(shí)候，直接在我這里復(fù)制可以了哈！ 333333333333333333333333.jpg |
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clear;clc D=[2.524,2.522,2.518,2.512,2.504,2.495,2.484,2.472,2.459,2.444,2.427,2.41,2.391,2.372,... 2.351,2.329,2.305,2.281,2.256,2.229,2.201,2.172,2.142,2.111,2.079,... 2.046,2.011,1.975,1.938,1.9,1.86,1.82,1.778,1.735,1.69,1.645,1.598,... 1.55,1.501,1.451,1.399,1.347,1.294,1.239,1.184,1.129,1.072,1.015,... 0.958,0.901,0.844,0.786,0.729,0.673,0.618,0.563,0.51,0.459,0.409,... 0.361,0.315,0.272,0.231,0.193,0.158,0.127,0.098,0.074,0.052,0.034,... 0.02,0.01,0.003,0,0,0.004,0.012,0.023,0.037,0.054,0.074,0.097,0.123,... 0.152,0.183,0.216,0.251,0.289,0.328,0.369,0.412,0.456,0.501,0.548,... 0.596,0.645,0.694,0.745,0.797,0.849,0.901,0.954,1.008,1.062,1.116,... 1.17,1.225,1.279,1.334,1.388,1.442,1.496,1.55,1.603,1.655,1.707,1.758,... 1.808,1.858,1.906,1.953,1.999,2.043,2.086,2.127,2.167,2.205,2.241,... 2.275,2.307,2.337,2.365,2.391,2.414,2.435,2.454,2.471,2.485,2.497,... 2.507,2.515,2.52,2.524,2.525]; for n=1:300 X=linspace(0,2*n*pi,144); Y=D.*cos(n*X); Z(n)=trapz(X,Y); end |
3樓2012-09-26 09:37:04
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