关于教材上ilaplace函数参数的争论

<p>1）教材中的用法没有问题，前面有函数定义，x是y的函数，对y进行拉式变换将x时域函数变换到t复数域，再通过逆拉式变换将t复数域函数变换到x时域。用什么符号其实是随便的，只要前后交代清楚。习惯上时域变量用t，复数域变量用s，以免引起不必要的误解，特别是没有前因后果时遵循约定是必要的。</p><p>2）按照约定俗成的用法，改写程序如下：</p><p>syms t s p;</p><p>ft = t^2&nbsp; %时域函数</p><p>Fs = laplace(ft,t,s)&nbsp; %对时域函数ft进行拉式变换 变换到复域 变换后的变量用s表示</p><p>ft_row = ilaplace(Fs,s, t)&nbsp; %对复域函数Fs进行逆拉式变换&nbsp; 变换到时域 变换后的变量用t表示</p><p>ft_row1 = ilaplace(Fs,s, p) %对复域函数Fs进行逆拉式变换&nbsp; 变换到时域 变换后的变量用p表示</p><p>3）在学习时不必在意变量名是什么，而要理解参数的意义。看以下帮助信息就一目了然了。</p><p><img src="https://nos.netease.com/edu-image/557ea380-0619-4238-9473-7f723abb420a.jpg" style="width: 554px; height: 371px;" /></p>

<p>截图不清楚，摘录文本如下：<br ></p><p>ilaplace(F) returns the Inverse Laplace Transform of F. By default, the independent variable is s and the transformation variable is t. If F does not contain s, ilaplace uses the function symvar.</p><p>ilaplace(F,transVar) uses the transformation variable transVar instead of t.</p><p>ilaplace(F,var,transVar) uses the independent variable var and transformation variable transVar instead of s and t, respectively.</p><p>&nbsp;</p><p>Input Arguments</p><p>F — Input</p><p>Input, specified as a symbolic expression, function, vector, or matrix.</p><p>var — Independent variable</p><p>Independent variable, specified as a symbolic variable, expression, vector, or matrix. This variable is often called the &quot;complex frequency variable.&quot; If you do not specify the variable, then ilaplace uses s. If F does not contain s, then ilaplace uses the function symvar to determine the independent variable.</p><p>transVar — Transformation variable</p><p>Transformation variable, specified as a symbolic variable, expression, vector, or matrix. It is often called the &quot;time variable&quot; or &quot;space variable.&quot; By default, ilaplace uses t. If t is the independent variable of F, then ilaplace uses x.</p><p>&nbsp;</p><p><br ></p>