MATLAB课程：代码示例之Programming（五）

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收藏 2016-03-09

MATLAB课程：代码示例之Programming（五）

Function Functions

This example shows how to use the output of one MATLAB® function as an input to another. This ability to specify a function's output as an input of another function serves a wide variety of purposes. Here we illustrate its use for finding zeros, optimization, and integration.

The HUMPS Function

A MATLAB function is a file that starts with the keyword function. This is what the function HUMPS looks like:

type humps

function [out1,out2] = humps(x)%HUMPS A function used by QUADDEMO, ZERODEMO and FPLOTDEMO.% Y = HUMPS(X) is a function with strong maxima near x = .3% and x = .9.%% [X,Y] = HUMPS(X) also returns X. With no input arguments,% HUMPS uses X = 0:.05:1.%% Example:% plot(humps)%% See QUADDEMO, ZERODEMO and FPLOTDEMO.% Copyright 1984-2014 The MathWorks, Inc.if nargin==0 x = 0:.05:1;endy = 1 ./ ((x-.3).^2 + .01) + 1 ./ ((x-.9).^2 + .04) - 6;if nargout==2, out1 = x; out2 = y;else out1 = y;end

Plot of HUMPS

This figure shows a plot of HUMPS in the domain [0,2] using FPLOT.

fplot(@humps,[0,2]);