MATLAB POLYSPACE RELEASE NOTES Manuel d'utilisateur télécharger pdf (Page 167)

Scripts and Functions

The function plot_f han dle, shown below, receives a function handle and

data, generates y-axis data using the function handle, and plots it:

function x = p lot_fhandle(fhandle , data)

plot(data, fhandle(data))

When you call plot_fhandle with a handle to the sin function and the

argument shown below, the resulting evaluation produces a sine wave plot:

plot_fhandle(@sin, -pi:0.0 1:pi)

Function Functions

A class of functions called “function functions” works with nonlinear functions

of a scalar variable. That is, one function works on another function. The

function functions include

• Zero finding

• Optimization

• Quadrature

• Ordinary differen tial equations

MATLAB represents the nonlinear function by a function M-file. For example,

here is a si mplified version of the function

humps from the matlab /dem os

directory:

function y = h umps(x)

y = 1./((x-.3).^2 + .01) + 1./((x-.9).^2 + . 04) - 6;

Evaluate this function at a set of points in the interval 0 ≤ x ≤ 1with

x = 0:.002:1;

y = humps(x);

Then plot the function with

plot(x,y)

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MATLAB POLYSPACE RELEASE NOTES Manuel d'utilisateur Page 167