** Trapezoidal numerical integration. **

** Z = TRAPZ(X,Y) computes the integral of Y with respect to X using **

** trapezoidal integration. X and Y must be vectors of the same length, **

** or X must be a column vector and Y a matrix with as many rows as X. **

** TRAPZ computes the integral of each column of Y separately. **

** The resulting Z is a scalar or a row vector. **

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** Z = TRAPZ(Y) computes the trapezoidal integral of Y assuming unit **

** spacing between the data points. To compute the integral for **

** spacing different from one, multiply Z by the spacing increment. **

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** See also SUM , CUMSUM . **

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