MATLAB POLYSPACE 7 Guide d'installation télécharger pdf (Page 413)

100

101

Debugging Process a nd Features

Code for collatz.m.

function sequence=collatz(n)

% Collatz problem. Generate a sequence of integers resolving to 1

% For any positive integer, n:

% Divide n by 2 if n is even

% Multiply n by 3 and add 1 if n is odd

% Repeat for the result

% Continue until the result is 1%

sequence = n;

next_value = n;

while next_value > 1

if rem(next_value,2)==0

next_value = next_value/2;

else

next_value = 3*next_value+1;

end

sequence = [sequence, next_value];

end

Code for collatzplot.m.

function collatzplot(m)

% Plot length of sequence for Collatz problem

% Prepare figure

clf

set(gcf,'DoubleBuffer','on')

set(gca,'XScale','linear')

% Determine and plot sequence and sequence length

for N = 1:m

plot_seq = collatz(N);

seq_length(N) = length(plot_seq);

line(N,plot_seq,'Marker','.','MarkerSize',9,'Color','blue')

drawnow

end

Trial Run for Example. Open the file collatzplot.m. Makesurethe

current directory is the directory in which you saved

collatzplot.

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MATLAB POLYSPACE 7 Guide d'installation Page 413

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