How can I create an array in Stateflow in the form Arr= [x y z]?

I use normal stateflow chart (not Chart(MATLAB))in Simulink R2012b.

I want to create an array of ten elements in Stateflow of the form:

P=[P1 P2 P3 P4 P5 P6 P7 P8 P9 P10].

Each element of the P-array is read in as an input from Simulink and can change in value during the simulation. P itself is an output to Simulink that I have set up to have a size of 10.

I have tried the method above, tried

P={P1 P2 P3 P4 P5 P6 P7 P8 P9 P10} and

P=(P1 P2 P3 P4 P5 P6 P7 P8 P9 P10)

but to no avail.

I don't want to do P[0]=P1;P[1]=P2... as it will be too long for me and besides, it seems to output my result as a scalar and not a 10x1 vector when I do so.

I have also tried to use the ml function such that P is defined as

P=ml('[P1 P2 P3 P4 P5 P6 P7 P8 P9 P10]')

with the following pre-definitions: ml.P1=P1, ml.P2=P2.... This too returns an error: 'Eval of MATLAB expression '[P1 P2 P3 P4 P5 P6 P7 P8 P9 P10]' in base workspace didn't return anything...'

I know this is straightforward in Matlab but I don't understand why it is so difficult in Stateflow.

Anyone who has addressed a similar challenge before should pls help. Any help will be greatly appreciated.

Thanks.

Answer 1

[Azzi Abdelmalek]

You can use

P=[P1 P2 P3 P4 P5 P6 P7 P8 P9 P10].

% P=(P1 P2 P3 P4 P5 P6 P7 P8 P9 P10) is not valid

Or you can use a MUX block in simulink, you will pass through it P1,P2,... then your Stateflow chart will have one input P with size (1,10). If you need P3 in your Stateflow chart, just use P[2].

[Omoniyi]

Thanks Azzi, but when I do

P=[P1 P2 P3 P4 P5 P6 P7 P8 P9 P10] in stateflow either as a chart entry action or as a transition action

I get a Lex Error:

P= [P1 P2 P3 P4 P5 P6 P7 P8 P9 P10]

   ^
syntax error.

As for the second suggestion, the array is meant to be formed from data calculated in stateflow and sent as an output to simulink, so I think the MUX method may not work.

Is there another way of doing it?

[Azzi Abdelmalek]

In your simulink model use a MUX block to have one signal P_in with size 10. Then your stateflow chart will have one input with size 10. In you chart click on your model explorer, set the size of your input P_in and output P_out to 10. If you want to use P1, just use P_in[0], for P2, it's P_in[1], and so on.

To output your signal just use

P_out=P_in

[Omoniyi]

Thanks Azzi! This works. It is quite awkward though as I have to assign values to P[0], P[1],P[2]...leading to very log expressions.

Answer 2

[Guy Rouleau]

In R2012b, the MATLAB Chart was introduce. In this release your initial attempt should work.