How to solve this error "Not enough input arguments."

Question

Tony Castillo 2020-2-14

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https://ww2.mathworks.cn/matlabcentral/answers/505500-how-to-solve-this-error-not-enough-input-arguments

编辑： Walter Roberson 2023-11-21

Dear all,

I have this code, though, I have previously defined all the variables, it still persist a message:

Not enough input arguments.
Error in Riesgo_C (line 2)
aux1 = V_in(V_in(:,12) == BATT,:);

The function:

function [deltaSOC] = Riesgo_C(V_in,BATT,PV,IRR)
aux1 = V_in(V_in(:,12) == BATT,:);
aux2 = aux1(aux1(:,11) == PV,:);
auxD = aux2(:,[2;4;6;8;10]);
auxI = aux2(:,[1;3;5;7;9]);
p = polyfit(auxI(1,:),auxD(1,:),1);
deltaSOC = polyval(p,IRR);
end

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Adam 2020-2-14

Functions have to be called with arguments actually passed in as they have their own sealed workspace, unlike a script. They know nothing at all about what exists in the calling workspace so you have to call the function as

[deltaSOC] = Riesgo_C(V_in,BATT,PV,IRR);

when you call it in order for it to have the inputs it needs.

Tony Castillo 2020-2-17

Thanks Adam

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Answer 1

Jon 2020-2-14

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Your function requires 4 input arguments. You must have called it with less than 4 input arguments. Please check your code where you call the Riesgo function to make sure that you in fact have 4 input arguments. If you can not find the mistake, then please copy the exact code where you call the function and post it here.

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Tony Castillo 2020-2-14

I do appreciate your help, the former code is this:

current_path = pwd;
DeltaSOC_all = [];
%%%%%Aquí se obtienen los "deltaSOC"
for i=1:100
    FolderName=['CMkb1_', num2str(i)];
    cd([pwd,'\',FolderName]);
    load soc
    
    soc_i=[soc.time([1]), soc.data([1])];
    soc_fin=[soc.time([end]), soc.data([end])];
    
    DeltaSOC=(soc_fin(2)-soc_i(2));
    DeltaSOC_all=[DeltaSOC; DeltaSOC_all];
    cd(current_path)
end
%%%Variable de entrada de irradiación
IrradiationTotal_Jm2=10440;
irr3 = ones(100, 1);
I_3=irr3*IrradiationTotal_Jm2;
Irradiationmin_Jm2=340;
irr1 = ones(100, 1);
I_1=irr1*Irradiationmin_Jm2;
Irradiationmode_Jm2=4660;
irr2 = ones(100, 1);
I_2=irr2*Irradiationmode_Jm2;
Irradiationmedia_Jm2=12009;
irr4 = ones(100, 1);
I_4=irr3*Irradiationmedia_Jm2;
IrradiationMAX_Jm2=31690;
irr5 = ones(100, 1);
I_5=irr5*IrradiationMAX_Jm2;
%%%Distribucion de Placas
PV_100=1105.*ones(10,1);
PV90=1105*0.9.*ones(10,1);
PV80=1105*0.8.*ones(10,1);
PV70=1105*0.7.*ones(10,1);
PV60=1105*0.6.*ones(10,1);
PV50=1105*0.5.*ones(10,1);
PV40=1105*0.4.*ones(10,1);
PV30=1105*0.3.*ones(10,1);
PV20=1105*0.2.*ones(10,1);
PV10=1105*0.1.*ones(10,1);
V2 =[PV_100; PV90; PV80; PV70; PV60; PV50; PV40; PV30; PV20; PV10];
%%%%Distribucion de las baterias
Bateries_100=186;
B9=Bateries_100*0.9;
B8=Bateries_100*0.8;
B7=Bateries_100*0.7;
B6=Bateries_100*0.6;
B5=Bateries_100*0.5;
B4=Bateries_100*0.4;
B3=Bateries_100*0.3;
B2=Bateries_100*0.2;
B1=Bateries_100*0.1;
u =[Bateries_100; B9; B8; B7; B6; B5; B4; B3; B2; B1];
V3=repmat(u,10,1); %%%%%para convertir el VECTOR V3 en un arreglo de 100 elementos para permutarlo con las otras 2 variables (irr y PV)
delta_soc1=flip(DeltaSOC_all);
% a=delta_soc
% % %%%%%%%Aqui ya estan las variables de entrada
V_in=[I_1,flip(DeltaSOC_all) I_2, flip(DeltaSOC_all),  I_3, flip(DeltaSOC_all), I_4, flip(DeltaSOC_all), I_5, flip(DeltaSOC_all) V2, V3 ];
% 

Tony Castillo 2020-2-14

Because I have not made a call to my function yet, I just was testing it with the variables loaded in the workspace, might it be the problem ?

Jon 2020-2-14

So then please copy and paste the command you are issuing to call it from the command line that produces the error. I think that you probably forgot to include one of the input parameters. You need to have 4.

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Answer 2

madhu 2023-11-21

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Not enough input arguments.

Error in mylaplasian (line 6)

[rows, cols]=size(g);

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Walter Roberson 2023-11-21

编辑：Walter Roberson 2023-11-21

You are running a function named mylaplasian which accepts one or more inputs, one of which is named g in the function. But when you run mylaplasian then you are not passing in enough parameters to put anything into the g slot.

You should rewrite your function to do something appropriate when the user calls it with fewer parameters than the maximum. For example,

mytest(10,20)
Input P was: 10
Input Q was: 20
mytest(30)
Input P was: 30
Input Q was: -99
mytest()
Error using solution>mytest
You need to pass at least one parameter to this function!
function mytest(P,Q)
   if nargin < 2; Q = -99; end
   if nargin < 1
       error('You need to pass at least one parameter to this function!');
   end
   fprintf('Input P was: %g\n', P);
   fprintf('Input Q was: %g\n', Q);
end

This code illustrates that you can detect that trailing optional parameters have not been passed in, and in that case you can put in default values if appropriate -- but that when the user has not passed in enough parameters for minimal functionality, that you should generate a meaningful error message to inform the user of what is needed.

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