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发表于 2010-4-21 20:55:29
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来自 山东淄博
这种含三角函数的方程一般是多解的,解与初值有关,将代码中如下句:
A=_A, x=1, i=XSLSF::pqrt[HFor("AB"),&x,1e-6],
改为:
A=_A, x=0.1, i=XSLSF::pqrt[HFor("AB"),&x,1e-6],
其中x为解方程初值。
得到如下图(1000个绘图点):
同时输出:
t=0.23599999999999993, A=21.239999999999995, B=-0.10699176696776018, AB=6.044367112320187e-002, 未满足精度要求,返回值仅作参考
t=0.25399999999999995, A=22.859999999999996, B=0.6462678324757678, AB=-1.5476520027029841, 未满足精度要求,返回值仅作参考
t=0.25579999999999997, A=23.021999999999998, B=0.13895573563177144, AB=-0.11853262240858076, 未满足精度要求,返回值仅作参考
t=0.39260000000000178, A=35.33400000000016, B=2.3141538447383634, AB=-3.5848958757671654, 未满足精度要求,返回值仅作参考
t=0.44660000000000249, A=40.194000000000223, B=-0.10821562374783429, AB=3.395683060775545e-002, 未满足精度要求,返回值仅作参考
t=0.46460000000000279, A=41.814000000000249, B=-0.10564977140091936, AB=-0.26969909677125903, 未满足精度要求,返回值仅作参考
t=0.46640000000000276, A=41.976000000000248, B=-1.1362423444262002, AB=8.8817841970012523e-016, 未满足精度要求,返回值仅作参考
t=0.53120000000000356, A=47.80800000000032, B=0.12504694031017638, AB=-3.4111443302274003e-002, 未满足精度要求,返回值仅作参考
t=0.54380000000000372, A=48.942000000000334, B=-0.32845957287961941, AB=-2.718588160144364e-009, 未满足精度要求,返回值仅作参考
t=0.58340000000000425, A=52.506000000000384, B=50.014331368132943, AB=0.1344754683491316, 未满足精度要求,返回值仅作参考
t=0.60320000000000451, A=54.288000000000409, B=0.98271464846136847, AB=-2.8327782756375131, 未满足精度要求,返回值仅作参考
t=0.65180000000000515, A=58.662000000000461, B=-24.690782715089522, AB=-7.8825834748386114e-015, 未满足精度要求,返回值仅作参考
t=0.67340000000000544, A=60.606000000000492, B=-9.9847751317575728e-002, AB=-0.26256920139773843, 未满足精度要求,返回值仅作参考
t=0.72560000000000613, A=65.304000000000556, B=3.0254945449961754, AB=7.9741768743701869e-014, 未满足精度要求,返回值仅作参考
t=0.74000000000000621, A=66.600000000000563, B=0.18584616828066736, AB=-3.6074498433307789e-003, 未满足精度要求,返回值仅作参考
t=0.75620000000000653, A=68.05800000000059, B=-0.27424315553824841, AB=1.2863876630575533e-012, 未满足精度要求,返回值仅作参考
t=0.86420000000000796, A=77.778000000000716, B=-0.27595415917319976, AB=0.10993289340065593, 未满足精度要求,返回值仅作参考
t=0.93440000000000889, A=84.096000000000799, B=0.45517900560517349, AB=1.9709590626248996e-009, 未满足精度要求,返回值仅作参考
t=0.95060000000000922, A=85.554000000000826, B=2.094255315262547e-002, AB=-0.12636660045044271, 未满足精度要求,返回值仅作参考
t=0.95600000000000918, A=86.04000000000083, B=0.21924214499356737, AB=-0.20744208840884626, 未满足精度要求,返回值仅作参考
t=1.0208000000000099, A=91.872000000000895, B=2.7084375215227774e-002, AB=-0.12658892906628622, 未满足精度要求,返回值仅作参考
t=1.0730000000000106, A=96.57000000000096, B=18.643201298211363, AB=7.0910900783409503e-002, 未满足精度要求,返回值仅作参考
t=1.0748000000000106, A=96.732000000000951, B=-0.18505571601464588, AB=1.3235891339475725e-002, 未满足精度要求,返回值仅作参考
t=1.0892000000000108, A=98.028000000000972, B=0.52378102228240464, AB=-0.75649543733381863, 未满足精度要求,返回值仅作参考
t=1.0946000000000109, A=98.514000000000976, B=-0.36850786603778174, AB=-0.14378365430067502, 未满足精度要求,返回值仅作参考
t=1.1594000000000118, A=104.34600000000106, B=0.68701881757929151, AB=-1.5608272756459918, 未满足精度要求,返回值仅作参考
t=1.1684000000000119, A=105.15600000000107, B=2.2634862081548551e-002, AB=-0.21240085279211854, 未满足精度要求,返回值仅作参考
t=1.1702000000000119, A=105.31800000000106, B=-131.97337017437312, AB=-0.22676658336386832, 未满足精度要求,返回值仅作参考
t=1.2134000000000125, A=109.20600000000113, B=-0.39855143896244105, AB=0.36595550982703884, 未满足精度要求,返回值仅作参考
t=1.2296000000000127, A=110.66400000000114, B=-1.112108171122502, AB=4.4630965589931293e-013, 未满足精度要求,返回值仅作参考
t=1.2836000000000134, A=115.52400000000121, B=-1.2812908508775211, AB=-4.4408920985006262e-016, 未满足精度要求,返回值仅作参考
t=1.3016000000000136, A=117.14400000000123, B=-53.25533861126052, AB=7.2997163869104043e-015, 未满足精度要求,返回值仅作参考
t=1.3682000000000145, A=123.13800000000131, B=0.19443836096053715, AB=-9.7590449757639641e-004, 未满足精度要求,返回值仅作参考
t=1.3700000000000145, A=123.3000000000013, B=-0.89667047469271921, AB=1.1043573394329849, 未满足精度要求,返回值仅作参考
t=1.3718000000000146, A=123.46200000000131, B=6.3513193238593608, AB=-0.12505451527879816, 未满足精度要求,返回值仅作参考
t=1.3790000000000147, A=124.11000000000132, B=6.2231361188493777, AB=-0.23863817598755682, 未满足精度要求,返回值仅作参考
t=1.424000000000015, A=128.16000000000136, B=-0.17877662471858569, AB=9.3165938521178604e-003, 未满足精度要求,返回值仅作参考
t=1.4420000000000155, A=129.78000000000139, B=-0.44582445965855844, AB=3.6137759451548845e-014, 未满足精度要求,返回值仅作参考
t=1.4456000000000155, A=130.10400000000141, B=1.7978894937407237e-002, AB=-0.20336766506098625, 未满足精度要求,返回值仅作参考
t=1.5176000000000165, A=136.58400000000148, B=-19.234921536903737, AB=-1.3045120539345589e-014, 未满足精度要求,返回值仅作参考
t=1.5788000000000173, A=142.09200000000155, B=-0.15026132137726742, AB=-0.28323578087700996, 未满足精度要求,返回值仅作参考
t=1.5806000000000173, A=142.25400000000155, B=-0.45099567483060737, AB=2.2204460492503131e-016, 未满足精度要求,返回值仅作参考
t=1.7174000000000194, A=154.56600000000174, B=0.18715643074958366, AB=-4.1211059817981566e-003, 未满足精度要求,返回值仅作参考
t=1.7210000000000192, A=154.89000000000172, B=-0.40729556696552727, AB=-9.5128498133236539e-002, 未满足精度要求,返回值仅作参考
t=1.7696000000000196, A=159.26400000000177, B=-14.047063046372154, AB=-9.6205639518237511, 未满足精度要求,返回值仅作参考
t=1.8578000000000212, A=167.2020000000019, B=0.1606356099221761, AB=-2.646791400684162e-002, 未满足精度要求,返回值仅作参考
t=1.8650000000000211, A=167.8500000000019, B=-1.1617374387243893, AB=-4.8849813083506888e-015, 未满足精度要求,返回值仅作参考
t=1.9280000000000219, A=173.52000000000197, B=0.12750452285190605, AB=-4.5625898014086674e-002, 未满足精度要求,返回值仅作参考
t=1.9298000000000219, A=173.68200000000198, B=12.736580657400062, AB=-8.355504525480778e-002, 未满足精度要求,返回值仅作参考
t=1.9406000000000221, A=174.65400000000199, B=-0.31857494446616447, AB=-9.8693406068930956e-004, 未满足精度要求,返回值仅作参考
t=1.9820000000000226, A=178.38000000000204, B=-0.24243568854155387, AB=4.8079115981049025e-002, 未满足精度要求,返回值仅作参考
t=2., A=180., B=0.37920542909507221, AB=-0.40582069612118654, 未满足精度要求,返回值仅作参考
而x=1时,仅一个输出:
t=1.2386000000000128, A=111.47400000000115, B=13.937513085017597, AB=-1.9365202293231252, 未满足精度要求,返回值仅作参考 |
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