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Flow Control

Loop Control – for, while, continue, break

This section covers those MATLAB functions that provide control over

program loops.

for

The for loop repeats a group of statements a fixed, predetermined number of

times. A matching

end delineates the statements:

forn=3:32

r(n) = rank(magic(n));

end

The semicolon terminating the inner statement suppresses repeated printing,

and the

r after the loop displays the final result.

It is a go o d ide a to indent the loops for readability, especially when they are

nested:

fori=1:m

for j = 1:n

H(i,j) = 1/(i+j);

end

while

The while loop repeats a group of statements an indefinite number of times

under control of a logical condition. A matching

end delineates the statements.

Here is a complete program, illustrating

while, if, else,andend,thatuses

interval bisection to find a zero of a polynomial:

a = 0; fa = -Inf;

b = 3; fb = Inf;

while b-a > ep s*b

x = (a+b)/2;

fx = x^3-2*x-5;

if sign(fx) == sign(fa)

a = x; fa = fx;

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MATLAB POLYSPACE RELEASE NOTES Manuale Utente Pagina 143