示例

以下示例使用了 lengthofline.m，它是帶有可改進代碼的 MATLAB 示例文件。您可以在 matlabroot/help/techdoc/matlab_env/examples 中可以找到該文件。如果要運行本例，請將 lengthofline.m 副本保存到 MATLAB 路徑下。

不帶任何選項的情況下對文件運行 mlint

要對示例文件 lengthofline.m 運行 mlint，請運行以下指令：

mlint('lengthofline')

MATLAB 在命令行窗口中顯示 lengthofline.m 的 M-Lint 消息：

L 22 (C 1-9): The value assigned here to variable 'nothandle' might never be used.

L 23 (C 12-15): NUMEL(x) is usually faster than PROD(SIZE(x)).

L 24 (C 5-11): 'notline' might be growing inside a loop. Consider preallocating for speed.

L 24 (C 44-49): Use STRCMPI(str1,str2) instead of using LOWER in a call to STRCMP.

L 28 (C 12-15): NUMEL(x) is usually faster than PROD(SIZE(x)).

L 34 (C 13-16): 'data' might be growing inside a loop. Consider preallocating for speed.

L 34 (C 24-31): Use dynamic fieldnames with structures instead of GETFIELD.

Type 'doc struct' for more information.

L 38 (C 29): Use || instead of | as the OR operator in (scalar) conditional statements.

L 39 (C 47): Use || instead of | as the OR operator in (scalar) conditional statements.

L 40 (C 47): Use || instead of | as the OR operator in (scalar) conditional statements.

L 42 (C 13-16): 'data' might be growing inside a loop. Consider preallocating for speed.

L 43 (C 13-15): 'dim' might be growing inside a loop. Consider preallocating for speed.

L 45 (C 13-15): 'dim' might be growing inside a loop.Consider preallocating for speed.

L 48 (C 52): There may be a parenthesis imbalance around here.

L 48 (C 53): There may be a parenthesis imbalance around here.

L 48 (C 54): There may be a parenthesis imbalance around here.

L 48 (C 55): There may be a parenthesis imbalance around here.

L 49 (C 17): Terminate statement with semicolon to suppress output (in functions).

L 49 (C 23): Use of brackets [] is unnecessary. Use parentheses to group, if needed.

有關這些消息及如何改善這些代碼的詳細信息，請參閱 MATLAB 桌面工具和開發環境文檔中的根據代碼分析器消息更改代碼。

以“顯示 ID”和“將結果返回到結構體”選項運行 mlint

要將結果存儲到結構體并包含消息 ID，請運行以下指令：

inform=mlint('lengthofline', '-id')

MATLAB 返回

inform =

19x1 struct array with fields:

message

line

column

id

要查看第一個消息的值，請運行以下指令：

inform(1)

MATLAB 顯示

ans =

message: 'The value assigned here to variable 'nothandle' might never be used.'

line: 22

column: [1 9]

id: 'NASGU'

此處，該消息表示，第 22 行上顯示的值從文件中的第 1 列延伸至第 9 列。NASGU 是消息 'The value assigned here to variable

'nothandle' might never be used.' 的 ID。

使用 mlint 顯示 McCabe 復雜度

要顯示 MATLAB 代碼文件的 McCabe 復雜度，需運行 mlint 并選擇 -cyc 選項，如下例所示(假設已將 lengthofline.m 保存到本地文件夾)。

mlint lengthofline.m -cyc

命令行窗口中的結果顯示了文件的 McCabe 復雜度，接著是 M-Lint 消息，如下所示：

L 1 (C 23-34): The McCabe complexity of 'lengthofline' is 12.

L 22 (C 1-9): The value assigned here to variable 'nothandle' might never be used.

L 23 (C 12-15): NUMEL(x) is usually faster than PROD(SIZE(x)).

L 24 (C 5-11): 'notline' might be growing inside a loop. Consider preallocating for speed.

L 24 (C 44-49): Use STRCMPI(str1,str2) instead of using UPPER/LOWER in a call to STRCMP.

L 28 (C 12-15): NUMEL(x) is usually faster than PROD(SIZE(x)).

L 34 (C 13-16): 'data' might be growing inside a loop. Consider preallocating for speed.

L 34 (C 24-31): Use dynamic fieldnames with structures instead of GETFIELD. Type 'doc struct'

for more information.

L 38 (C 29): Use || instead of | as the OR operator in (scalar) conditional statements.

L 39 (C 47): Use || instead of | as the OR operator in (scalar) conditional statements.

L 40 (C 47): Use || instead of | as the OR operator in (scalar) conditional statements.

L 42 (C 13-16): 'data' might be growing inside a loop. Consider preallocating for speed.

L 43 (C 13-15): 'dim' might be growing inside a loop. Consider preallocating for speed.

L 45 (C 13-15): 'dim' might be growing inside a loop. Consider preallocating for speed.

L 48 (C 52): There may be a parenthesis imbalance around here.

L 48 (C 53): There may be a parenthesis imbalance around here.

L 48 (C 54): There may be a parenthesis imbalance around here.

L 48 (C 55): There may be a parenthesis imbalance around here.

L 49 (C 17): Terminate statement with semicolon to suppress output (in functions).

L 49 (C 23): Use of brackets [] is unnecessary. Use parentheses to group, if needed.

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