keeping equations in different formats

3 次查看（过去 30 天）
Gil maor
Gil maor 2017-8-1
回答： Gil maor 2017-8-3
Hello All.
I have a problem. In my project I have three equations which in times I use with symbolic analysis and some times with numerical values. The problem is that I cannot keep the equations as syms due to the following reasons:
1. I need to always change update the syms in different parts of the code and functions 2. Using subs or eval commands take a lot of time mainly when I use loops to change the values.
Is there a way that I could have the equations saved and call them at symbolic form or numerical form and change the variables without using subs/eval?
Thanks!
Gil,
  8 个评论
显示 6更早的评论
Karan Gill
Karan Gill 2017-8-2
If you want to save/load equations, then use MAT files: https://www.mathworks.com/help/matlab/matlab_env/save-load-and-delete-workspace-variables.html
Of course, that won't work if your numeric values keep changing. You'll have to use subs. Can you provide an example where subs is too slow?
Gil maor
Gil maor 2017-8-3
Hi Karan, Thanks for your reply.
As for the slowness of subs, this was my doing, I have forgotten to place 'double' in front of the 'subs' so the result was an array of sym...
For advice regrading save , load for the equation object!
Thanks!
Gil,

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Gil maor
Gil maor 2017-8-3
Thanks All.
Problems solved using sym('avr') when ever calling on the equatiobs
Thanks ALL!!

更多回答（1 个）

Walter Roberson
Walter Roberson 2017-8-3
I suggest that you could keep a struct, one field of which is the symbolic form, and another is the result of calling matlabFunction to transform the symbolic form to a function handle for numeric work.

类别

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

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by