control hystérésis 4 level

function dP=active(x)

err=x(1);hys=x(2);

if err>=hys

dP=2;

elseif (0<err && err<hys)

dP=1;

elseif (-hys<err && err<0)

dP=-1;

elseif err<-hys

dP=-2;

end;

end

i got problem:Not enough input arguments line (2).

[Dyuman Joshi]

How are you calling the function? What is the input provided?

[laiche zeghdi]

input it is Err

[Dyuman Joshi]

Are you working with a Simulink model?

Or are you just running the code you posted?

[laiche zeghdi]

I use simulink model. I use simulink DPC with NPC 3level (control error power direct with hystirsis 4 level )