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Why does the code give different results with different versions of MATLAB?

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Sarah Ghosh
Sarah Ghosh 2013-6-8
The following code gives the required (and correct) answer with MATLAB 6.1 but with MATLAB 7, it gives the following error that the variable I is not recognised. This variable I appears with the execution of the statement with P matrix.
clc;
A=[-00967 21277;
-00050 0;];
T=1/2500.0;
y=[0;24.0/L];
syms d t
C=int(expm(A*(T-t))*y,d*T,T);
B=inv(eye(2)-expm(A*T));
x=B*C;
D=expm(A*d*T);
P=[1 0]*D*x
I variable appears in the P matrix in MATLAB 7. Please explain the anomaly. It is urgent

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-6-8
编辑：Azzi Abdelmalek 2013-6-8
y=[0;24.0/L];
How Matlab will calculate 24.0/L if the value of L is unknown?
You should give a value to L, for example
L=1
y=[0;24.0/L];

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