MATLAB POLYSPACE RELEASE NOTES Manuel d'utilisateur télécharger pdf (Page 142)

4 Programming

elseif A < B

'less'

elseif A == B

'equal'

else

error('Unexpected situatio n')

end

Several functions are helpful for reducing the results of matrix comparisons

to scalar cond itions for use with

if, including

isequal

isempty

all

any

switch and case

The switch statement executes groups of statements based on the value of

a variable or expression. The keywords

case and otherwise delineate the

groups. Only the first m atching case is executed. There must always be an

end to ma tch the switch.

The logic of the magic squares algorithm can also be described by

switch (rem(n,4)==0) + (rem(n,2)==0)

case 0

M = odd_magic(n)

case 1

M = single_even_magic( n)

case 2

M = double_even_magic( n)

otherwise

error('This is impossible')

end

Note Unlike the C language switch statement, MATLAB sw itch does not

fall through. If the first

case statem ent is true, the other case statements do

not e xecute. So,

break statements are n ot require d.

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MATLAB POLYSPACE RELEASE NOTES Manuel d'utilisateur Page 142