How to create symbol function matrix in matlab?

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Chuangchuang Sun
Chuangchuang Sun 2014-12-8
评论： Andrew Newell 2014-12-8
I need to solve a linear differential equations, such as diff(Y) = AY, Y(0) = Y0. Y \in R^n; So I need to generate a column of symbol function. I used the following code
clc;clear;
n = 7;
syms t V;
A = sym('A', [n 1]);
U = symfun(A,[t]);
However, as the result shows, the size of U is 1 by 1. I don't know what is wrong and how I can make it work.
I will appreciate your help a lot. Best,

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采纳的回答

Star Strider
Star Strider 2014-12-8
The solution to your differential equation (assuming a constant ‘A’) is:
Y = expm(A*t)
You will likely have significant problems with it in the Symbolic Math Toolbox. I would deal with it only numerically.

更多回答（1 个）

Andrew Newell
Andrew Newell 2014-12-8
To get an n x n matrix, use
A = sym('A',n);
  1 个评论
Chuangchuang Sun
Chuangchuang Sun 2014-12-8
I change the way to generate A but the resulting U is still shown to be 1 by 1. It seems it doesn't make a difference. Thanks!

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