MATLAB POLYSPACE RELEASE NOTES Manuale Utente Scaricare il pdf (Pagina 36)

2 Matrices and Arra ys

realmax

Largest floatin g-point num ber,

Inf

Infinity

NaN

Not-a-number

Infinity is generated by d ividing a nonzero value by zero, or b y evaluating

well defined mathematical expressions that overflow, i.e., exceed

realmax.

Not-a-number is generated by trying to evaluate expressions like

0/0 or

Inf-Inf that do not have well defined mathematical values.

The f unction names are not reserved. It is possible to overwrite any of them

with a new variable, such as

eps = 1.e-6

and then use that value in subsequent calculations. The original function

can be restored with

clear eps

Examples of Expressions

You have alre ady seen se veral examples of MATLAB expressions. H ere are a

few more examples, and the resulting values:

rho = (1+sqrt(5))/2

rho =

1.6180

a = abs(3+4i)

z = sqrt(besselk(4/3,r ho-i))

0.3730+ 0.3214i

huge = exp(log(realmax))

huge =

1.7977e+308

2-14

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MATLAB POLYSPACE RELEASE NOTES Manuale Utente Pagina 36