i have a problem in my program this is code load sys-mbc-22.mat double A ; double B ; double C ; double D ; double Z ; char r ; Z = zeros([30 1]) r = DescStates A = MBC_AvgA B = B2 C = C2 D = D2 %model = 'linopenloopsyss';

i have a problem in my program this is code

load sys-mbc-22.mat
double  A ;
double  B ;
double  C ;
double  D ;
double  Z ;
 char  r ;
Z =  zeros([30 1])
r =  DescStates
A = MBC_AvgA 
 B = B2      
C = C2    
D = D2    
TMax = 100;
sim('linOpenLoopsyss',[0,TMax]);

when execute it gives

Error using matrices (line 25)
Invalid setting in 'linopenloopsyss/State-Space' for parameter 'X0'.

this image of simulink block parameter

what i can do ???

Answer 1

[Walter Roberson]

Change the initial conditions from

'Z'

to

Z

Side note:

In MATLAB, you do not declare the data types of variables. None of the following lines has any useful effect:

double  A ;
double  B ;
double  C ;
double  D ;
double  Z ;
 char  r ;

You can just remove them.

[rana]

it gives me this error

A valid state attribute should be either a character vector, a cell array or a valid MATLAB structure

[Walter Roberson]

I suspect that the

{r}

for the state name should be

r

without the {}

[rana]

i am sorry but it gives error

Invalid state name specified for block 'linopenloopsyss/State-Space', a valid state name should be a dot-delimited sequence of Matlab identifiers

note that states is vector (30 x1)

[Walter Roberson]

If you mean that DescStates is a 30 x 1 cell array of strings, then you need to pick one of them for the state name, such as

r{1}

[rana]

finally it works when i change r to 'r' , really thanks for your caring

Answer 2

[DJIBRINE Abakar]

Hi

Sir

please to answer this question

A valid state attribute should be either a character vector, a cell array or a valid MATLAB structure

[Walter Roberson]

We need more context for this. Which toolbox are you using? What have you configured for that block?

[Drishya Dinesh]

used Tf block

[Walter Roberson]

you need to pass in a quoted string for the state name, such as 'position' including the '' characters