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<TITLE> 线上说明 </TITLE>
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<H1>2.3 线上说明</H1>
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在MATLAB系统中相关的线上(on-line)求助方式有三：
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<LI>是利用<FONT COLOR=#FF0000>help</FONT>指令，如果你已知要找的题材
(topic) 为何的话，直接键入<FONT COLOR=#FF0000>help <topic></FONT>。所以即使身旁没有使用手册，也可以使用<FONT COLOR=#FF0000>help</FONT>指令查询不熟悉的指令或是题材之用法，例如<FONT COLOR=#FF0000>help
sqrt</FONT>, <FONT COLOR=#FF0000>help topic</FONT>。
<LI>是利用<FONT COLOR=#FF0000>lookfor</FONT>指令，它可以从你键入的关键字(key-word)（即始这个关键字并不是MATLAB的指令）列出
所有相关的题材，例如<FONT COLOR=#FF0000>lookfor cosine</FONT>, <FONT COLOR=#FF0000>lookfor sine</FONT>。
<LI>是利用指令视窗的功能选单中的<B>Help</B>，从中选取<B>Table of Contents</B>（目录）或是<B>Index</B>（索引）。
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例如
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<FONT COLOR=#FF0000>>> help sqrt</FONT>
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<FONT COLOR=#FF0000>SQRT Square root.</FONT>
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<FONT COLOR=#FF0000>SQRT(X) is the square root of the elements
of X. Complex</FONT>
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<FONT COLOR=#FF0000>results are produced if X is not positive.
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<FONT COLOR=#FF0000>>> help monkey</FONT>
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<FONT COLOR=#FF0000>monkey not found.<BR>
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<FONT COLOR=#FF0000>>>* lookfor tangent</FONT>
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<FONT COLOR=#FF0000>ACOT Inverse cotangent.</FONT>
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<FONT COLOR=#FF0000>ACOTH Inverse hyperbolic cotangent.</FONT>
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<FONT COLOR=#FF0000>ATAN Inverse tangent.</FONT>
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<FONT COLOR=#FF0000>ATANH Inverse hyperbolic tangent.</FONT>
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<FONT COLOR=#FF0000>ATAN2 Four quadrant inverse tangent.</FONT>
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<FONT COLOR=#FF0000>COT Cotangent.</FONT>
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<FONT COLOR=#FF0000>COTH Hyperbolic cotangent.</FONT>
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<FONT COLOR=#FF0000>TAN Tangent.</FONT>
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<FONT COLOR=#FF0000>TANH Hyperbolic tangent.<BR>
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<FONT COLOR=#FF0000>>> help atan</FONT>
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<FONT COLOR=#FF0000>ATAN Inverse tangent.</FONT>
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<FONT COLOR=#FF0000>ATAN(X) is the arctangent of the elements
of X. See also ATAN2.<BR>
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