为什么我的fimplicit情节空?
4视图(30天)
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信谊x (t)
数值= diff (x, t, 2) + (4.2 / (t + 3) / 2) * x = = 0;
Dx = diff (x);
DDx = diff (Dx);
cond1 = x (0) = = 0;
cond2 = Dx (0) = = 5;
气孔导度= [cond1 cond2];
xSol = dsolve(数值、气孔导度);
fimplicit (@ (t) xSol (t) [-20 -20 20])
xlim (-10 [10]);
ylim (-10 [10]);
网格在;
我试图阴谋这个方程,情节打开但是它都是空的。
警告:无法找到明确的解决方案。
在dsolve >(第201行)
在测试(12)行