Simulink: MATLAB Function Doesn't Recognise Variables

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MATLAB_Soldier
MATLAB_Soldier 2022-11-15
回答： cr 2022-11-15
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?

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采纳的回答

cr
cr 2022-11-15
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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