state space model has error

Question

Neel 2013-11-27

3
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https://ww2.mathworks.cn/matlabcentral/answers/107732-state-space-model-has-error

评论： Neel Dalwadi 2021-9-29

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my A B C D matrices are:

A =

[ 0, 0, 1.0, 0]

[ 0, 0, 0, 1.0]

[ 0, 0.15502416677813339370370805808099, -4.7863736679940324215607420213982, -0.0000033656243151182583405463328000383]

[ 0, -26.094361926054232600130044495449, -11.022752876224010373586983854075, 0.0000077508459792499219645213236865318]

B =

                                  0
                                  0
 0.88636549407296896004815441721882
 -2.0412505326340757878851343018816

C =

[ 1.0, 0, 0, 0]

[ 1.0, 0, 1.0, 0]

D =

 0
 0

when i do sys = ss(A,B,C,D)

Error using ss (line 260) The value of the "a" property must be a numeric array without any Inf's or NaN's.

Error in delete6 (line 50) sys = (ss(A,B,C,D))

this error is seen

how to solve this?

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Answer 1

Elias Hasle 2018-10-11

5
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I don't know if this is relevant to your (five year old) case, but in case someone else encounters this error message: I got it after inputting data from a symbolic calculation, although the arrays did not look symbolical. Casting the arguments to double removed the error.

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Victory Friday 2021-9-28

Please how do you cast to double?

Neel Dalwadi 2021-9-29

You can use the function double() for Matlab.

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Answer 2

Osman AKYUREK 2019-11-12

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Hi,

I have the same error massage. I think this is because of the fact that some zeros in the matrix A. Therefore, the response of the model cannot be obtained through state-space modelling. You need to check out the matrix A. For example in my case:

if there is zero component in the matrix Mst, the same error pops up, because it is going to be infinitive value in the matrix A. I hope this helps you. Check your matrix A.

Best,

Osman

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Answer 3

Azzi Abdelmalek 2013-11-27

0
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Your arrays are not correctly written

A =[ 0, 0, 1.0, 0
0, 0, 0, 1.0
0, 0.15502416677813339370370805808099, -4.7863736679940324215607420213982, -0.0000033656243151182583405463328000383
0, -26.094361926054232600130044495449, -11.022752876224010373586983854075, 0.0000077508459792499219645213236865318]
B =[0;0;0.88636549407296896004815441721882; -2.0412505326340757878851343018816]
C =[ 1.0, 0, 0, 0; 1.0, 0, 1.0, 0]
D =[ 0; 0]
sys = ss(A,B,C,D)