Simulink: MATLAB Function Doesn't Recognise Variables

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Hi All,
I have created this a MATLAB Function in simulink which I would like to run. This function uses certain variables which I have loaded in through the PreLoadFcn as follow:
This is the code inside my function:
function G = fcn(v,vp,gp)
if v <= Up2 & vp < Up2 | v <= Dn1 & vp > Dn1;
G=1;
elseif Up2 < v & v <= Up3 & vp < Up3 | Dn1 < vp & vp < Dn2;
G=2;
elseif Up3 < v & v <= Up4 & vp < Up4 | Dn2 < vp & vp < Dn3;
G=3;
elseif Up4 < v & v <= Up5 & vp < Up5 | Dn3 < vp & vp < Dn4;
G=4;
elseif Up5 < v & v <= Up6 & vp < Up6 | Dn4 < vp & vp < Dn5;
G=5;
elseif Up6 < v & Up6 < vp | Dn5 < v & Gp==6
G=6,
else
disp("LOGIC ERROR")
end
I saved the simulation and reopened it. Then, I get these error messages after I click on the run button:
Why does the function not able access the variables above?

Accepted Answer

cr
cr on 15 Nov 2022
Of course it doesn't. That is intended behaviour. Functions have their own workspace which is distinct from base workspace (or model workspace). If you need the function to use the variables/parameters declared in preloadfcn, you must pass in these variables separately. You may use a from workspace block and input it to additional input port(s) on the fcn block. Your fcn definition may become something like
function G = fcn(v,vp,gp,Up1,Up2,Up3,Up4,Up5,Dn1,Dn2,Dn3,Dn4,Dn5)
or better, mux all ups and dns into two signals, say ups and dns and use
fcn(v,vp,gp,ups,dns)
Regards

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