changing variables in syms

3 次查看（过去 30 天）

显示更早的评论

Franco 2011-10-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/18131-changing-variables-in-syms

采纳的回答： Sean de Wolski

If I am working in syms and I say

c= I * (a * I + b * J)

How do I tell matlab that I want I * J = 0 so that it outputs

c = I * (a * I)?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Sean de Wolski 2011-10-12

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/18131-changing-variables-in-syms#answer_24397

在 MATLAB Online 中打开

subs(c,'J',0)

since J or I has to be zero in the substitution and you want I retained.

4 个评论
显示 2更早的评论隐藏 2更早的评论

Walter Roberson 2011-10-12

Franco, I * J does not express dot product. MuPad expresses dot product via the MuPad routine linalg::scalarProduct (which is not exposed at the MATLAB level.)

If you are using the Maple based symbolic engine, then Maple's dot product operator is . (period), as in maple('A . B')

Franco 2011-10-12

thanks Walter.

请先登录，再进行评论。

类别

Mathematics and Optimization Symbolic Math Toolbox MuPAD MuPAD Language Fundamentals Data Types Data Structures Common Operations

在 Help Center 和 File Exchange 中查找有关 Common Operations 的更多信息

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by