MATLAB POLYSPACE 7 Guía de instalación descargar pdf (Pagina 473)

M-Lint Code Check Report

Messages and Resulting Changes for the lengthofline Example. The

following table describes each message and demonstrates a way to change the

file, based on the message.

Message — Code (Original Line Numbers)

Explanation and Updated Code (New

Line Numbers)

22: The value assigned here to

variable 'nothandle' might never be

used.

—————————————————

22 nothandle = ~ishandle(hline);

23 for nh = 1:prod(size(hline))

24 notline(nh) = ~ishandle(hline(nh))

...

In line 22, nothandle is assigned a valu e, bu t

nothandle is probably not used anywhere after

thatinthefile. Thelinemightbeextraneous

and you could delete it. But it might be that

you actually intended to u se the variable, which

isthecaseforthe

lengthofline example.

Update line 24 to use

nothandle,whichis

faster th a n computing

~ishandle for ea ch

iteration of the loop, as s h own he re.

22 nothandle = ~ishandle(hline);

23 for nh = 1:numel(hline)

24 notline(nh) = nothandle(nh) ...

23: NUMEL(x) is usually faster than

PROD(SIZE(x)).

—————————————————

23 for nh = 1:prod(size(hline))

While prod(size(x)) returns the number

of elements in a m atrix, the

numel function

wasdesignedtodojustthat,andthereforeis

usually more efficient. Type

doc numel to see

the

numel reference page. Change the line to

23 for nh = 1:numel(hline)

7-21

1 2 ... 468 469 470 471 472 473 474 475 476 477 478 ... 617 618

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