MATLAB: Is it ok to have a function where the input is the output

functioninputsoutputs

i have a function where the "ebatt" is an array of numbers and every number of this array depends on it's predecessor : as it follows :

function [ebatt,epg,dps]= chargebatt(ebatt,i,sigmma,epv,ech,Rond,rbatt,Ebattmax)
        ebatt(i) = ebatt(i-1).*(1-sigmma)+(epv(i)-ech(i))/Rond;
        if ebatt(i)> Ebattmax
            epg(i)= epv(i)-(ech(i)./Rond+(Ebattmax-ebatt(i-1))/rbatt);
            ebatt(i) = Ebattmax;
            dps(i) = 0;
        else
            epg(i) =0;
            dps(i) =0;
        end

is it ok to put the output of this function the same as the input ebatt

Best Answer

Yes.

function x=myfun(x)
  % stuff
end

is entirely valid. A little on the boring side, but...

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MATLAB: Does any elegant way to pass augments through nested function calls

Instead of using vargin, you could include one input that is either a cell array or a structure.

Example using cell array

allInputs = {1,2,3,4,5,6,7,8,9,'nest',[],[],[]}
a = nestb(allInputs)
function varargout = nestb(allInputs)
    % b will always be allInputs{1}
    % k will always be allInputs{11} (and it might be empty)
    % to determine which inputs are not empty:   ~cellfun(@isempty, allInputs)
    if allInputs{1} > 0
        tmpb = allInputs{1} + nestc(allInputs{2:5})
    else
        tmpb = nestc(allInputs{2:5})
    end
    varargout{1} = tmpb;
end

Example using structure

allInputs.b = 1;
allInputs.c = 2;
allInputs.d = 3;  %etc...
allInputs.k = 'nest'; 
a = nestb(allInputs)
function varargout = nestb(allInputs)
    % test will always be allInputs{11} and it might be empty 
    % to determine if a field exists:   isfield(allInputs, 'fieldname')
    if allInputs.b > 0
        tmpb = allInputs.b + nestc(allInputs) %adapt nestc() to handle structure input
    else
        tmpb = nestc(allInputs)
    end
    varargout{1} = tmpb;
end

MATLAB: Get maximum number of outputs from anonymous function

Hello Luca,

That's a somewhat tricky one, and I agree that going the "eval" route is not the best way. You can get around it using some tricks with cell arrays. Also, I believe that you can use nargout directly on the function handle.

f = @max;
x = rand(3);
results = cell(1, nargout(f));
[results{:}] = f(x);

-Cam

Best Answer

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MATLAB: Does any elegant way to pass augments through nested function calls

MATLAB: Get maximum number of outputs from anonymous function

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