Maxima：如何在表达式前面避免负号 [英] Maxima: How to avoid negative symbol in the front of an expression

问题描述

这是我的测试代码：

kill(all)$
assume(beta>0 and gamma>0)$
simpsum:true$
assume(beta<1 and gamma<=1)$
f2:1-sum((1-beta)^l*(1-gamma)^(l-1)*gamma,l,1,inf),ratsimp;

输出是：

实际上有一个负号方程的前面。方程式是：

There is actually a negative sign in the front of the equation. The equation is:

-beta /（（beta-1）* gamma-beta）

-beta/((beta-1)*gamma-beta)

但是经常忽略负号，因为它太接近于分数。我不喜欢开始时带负号的方程式。

But you often neglect the negative sign as it is too close to the fraction. I do not like a equation with a negative sign in the beginning either.

Maxima是否还能避免方程前面的负号？我想将示例方程式转换为：

Is there anyway in Maxima that can avoid the negative sign in the front of an equation? I want to transform the example equation to:

更新 - 使用时出现的错误：lisp

< img src =https://i.stack.imgur.com/66ZqA.pngalt =enter image description here>

推荐答案

我不知道有什么办法让Maxima把减号带入分数。但也许这将有助于：您可以通过更改其显示属性来告诉wxMaxima以不同的方式显示减号。尝试这样：

I don't know a way to get Maxima to bring the minus sign into the fraction. But maybe this will help: you can tell wxMaxima to display the minus sign differently by changing its display property. Try this:

:lisp (setf (get 'mminus 'wxxmlsym) '("<v>- </v>"))

默认情况下，字符串为 - ，即没有尾随空格。当然，你可以使字符串任何你喜欢的。

By default, the string is "-", i.e., with no trailing space. Of course, you can make the string anything you like.

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