Identity

Identity[expr]

给出 expr(恒等运算).

范例

打开所有单元关闭所有单元

基本范例  (1)

应用  (1)

绘制一组函数以及直线

属性和关系  (4)

Identity 会在函数复合中被清除:

恒等函数的一阶导数是常数 1:

Sequence 作为若干个参数的恒等函数:

Identity 作为纯函数:

巧妙范例  (1)

不使用辅助变量,列出值的平方根:

Wolfram Research (1988),Identity,Wolfram 语言函数,https://reference.wolfram.com/language/ref/Identity.html.

文本

Wolfram Research (1988),Identity,Wolfram 语言函数,https://reference.wolfram.com/language/ref/Identity.html.

CMS

Wolfram 语言. 1988. "Identity." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/ref/Identity.html.

APA

Wolfram 语言. (1988). Identity. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/ref/Identity.html 年

BibTeX

@misc{reference.wolfram_2024_identity, author="Wolfram Research", title="{Identity}", year="1988", howpublished="\url{https://reference.wolfram.com/language/ref/Identity.html}", note=[Accessed: 15-November-2024 ]}

BibLaTeX

@online{reference.wolfram_2024_identity, organization={Wolfram Research}, title={Identity}, year={1988}, url={https://reference.wolfram.com/language/ref/Identity.html}, note=[Accessed: 15-November-2024 ]}