与Matlab无限集成 [英] infinite integration with matlab

问题描述

我想在Matlab中计算以下类型的积分.

I want to compute the following type of integrals in Matlab.

它是函数e ^-(u)* u的积分，边界为零和无穷大.该积分应返回1.

It is the integral of function e^-(u)*u and the boundaries are zero and infinity. This integral should return 1.

如何在Matlab中做到这一点?

How can I do this in Matlab?

推荐答案

如果您没有符号工具箱，或者想要提高速度，则quadgk支持无限限制:

And if you don't have the symbolic toolbox, or want more speed, quadgk supports infinite limits:

f = @(x) x.*exp(-x);
a = quadgk(f, 0, inf) 

a =
    1.000000000000000e+00

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