how to use syms variables in function?

3 次查看（过去 30 天）
ming Lu
ming Lu 2019-6-7
回答： Star Strider 2019-6-7
i wrote a function for matrix:
%=============================
function [A] = Test(a,b)
A(1,1)=a+1;
A(1,2)=b;
end
%=======================
the function is nothing special. when i input in Command Window area of Matlab:
>> syms a b
>> Test(0,b)
but Matlab shows:
The following error occurred converting from sym to double: DOUBLE cannot convert the input expression into a double array. Error in Test (line 3) A(1,2)=b;
Matlab tell me there is a mistake(my Expect to return: A=[1,b])
how to fix this problem,thank you very much!

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2019-6-7
In order to do that, you will have to convert ‘A’ to a symbolic object as well:
function [A] = Test(a,b)
A = sym('A',[1 2])
A(1,1)=a+1;
A(1,2)=b;
end
then:
Q = Test(0,b)
Q =
[ 1, b]

更多回答（0 个）

类别

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

标签

Community Treasure Hunt

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

Start Hunting!

Translated by