# 3.1.5: 激活元素 (Activate Element)

元素的激活状态可以通过**“Activate Element（激活元素）”**运算器来控制（如图3.1.5.1）。该运算器需要一个模型以及一个布尔值列表作为输入。True/False值列表将映射到模型中元素的激活状态。**“True”**对应激活状态，而**“False”**则对应非激活状态。本手册第[3.5.9](/chinese_1_3_3/3-in-depth-component-reference/3.5-algorithms/3.5.9-beso-for-beams.md)节说明了**“Activate Element（激活元素）”**运算器如何帮助用户查看**“BESO for Beams（梁的双向渐进化结构优化）”**迭代算法的求解历史。

{% hint style="info" %}
Karamba3D中，可通过将元素设置为零重量的弱性材料使其处于非激活状态。
{% endhint %}

![图3.1.5.1：使用布尔值列表将模型的所有元素设置为激活状态](/files/-M9XuVde0v7LL3u1_5Nw)


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