MATLAB POLYSPACE RELEASE NOTES Manuale Utente Scaricare il pdf (Pagina 169)

Scripts and Functions

Q = quadl(@humps,0,1)

computes the area under the curve in the graph and produces

29.8583

Finally, the graph shows that the function is never zero on this interval. So,

ifyousearchforazerowith

z = fzero(@humps,.5)

you will find one outside the interval

-0.1316

Vectorization

One way to make your M ATLAB programs run faster is to vectorize the

algorithms you use in constructing the programs. Where other programming

languages might use

for loops or DO loops, MATLAB can use vector or matrix

operations. A simple example involves creating a table of logarithms:

x = .01;

for k = 1:1001

y(k) = log10(x);

x=x+.01;

end

A vectorized version of the same code is

x = .01:.01:10;

y = log10(x);

For more co mplicated code, vectorization options are not always so obv io us.

For More Information See “Improving Performan ce and Memo r y U sa ge”

in the MATLAB Programming documentation for other techniques that you

can use.

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MATLAB POLYSPACE RELEASE NOTES Manuale Utente Pagina 169