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ÒÔÏÂÄÚÈÝÀ´×Ômatlab˵Ã÷Îĵµ£º If int cannot compute a closed form of anintegral, it issues a warning and returns an unresolved integral: syms x F = sin(sinh(x)); int(F, x)Warning: Explicit integral could not be found. ans = int(sin(sinh(x)), x) If int cannot compute a closed form of anindefinite integral, try to approximate the expression around somepoint using taylor, and thencompute the integral. For example, approximate the expression around x =0: int(taylor(F, x, 'ExpansionPoint', 0, 'Order', 10), x)ans = x^10/56700 - x^8/720 - x^6/90 + x^2/2 Compute this definite integral: syms x F = int(cos(x)/sqrt(1 + x^2), x, 0, 10)Warning: Explicit integral could not be found. F = int(cos(x)/(x^2 + 1)^(1/2), x == 0..10) If int cannot compute a closed form of adefinite integral, try approximating that integral numerically using vpa. For example, approximate F with5 significant digits: vpa(F, 5)ans = 0.37571 |
3Â¥2013-04-26 10:09:10














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