MATLAB POLYSPACE RELEASE NOTES Manual de usuario descargar pdf (Pagina 34)

2 Matrices and Arra ys

The genvarname function can be useful in creating variable names that are

both valid and unique.

Numbers

MATLAB uses conventional decimal notation, with an optional decimal point

and leading plus or minus sign, for numbers. Scientific notatio n uses the

letter

e to specify a power-of-ten scale factor. Imaginary numbers use either i

or j as a suffix. Some examples of legal numbers are

3 -99 0.0001

9.6397238 1.6021 0e-2 0 6.02252e23

1i -3.14159j 3e5i

All numbers are stored internally using the long format specified by the IEEE

floating-point standard. Floating-point numbers have a finite precision of

roughly 16 significant decimal digits and a finite range of roughly 10

-308

to 10

+308

The section “Avoiding Com mon Probl em s with Floating-Point A ri th m etic”

gives a few of the examples showing how IEEE floating-point arithmetic

affects computations in MATLAB. For more examples and inform ation, see

Technical N ote 1108 — Common Problems with Floating-Point Arith metic.

Operators

Expressions use familiar arithmetic operators and precedence rules.

Addition

Subtraction

Multiplication

Division

Left divi sion (describ e d in “Matrices a n d Linear Algebra ”

in the MATLAB documentation)

Power

2-12

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MATLAB POLYSPACE RELEASE NOTES Manual de usuario Pagina 34