how can call a function

Question

brahmi ibtissem 2019-8-18

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评论： Walter Roberson 2019-8-19

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Hello everyone,

how can i call this function in an other function?

i need to plot a, b, c and d:

function [o, a, b, c, d] = ObjectiveFunction(X )
 a=sum(throughputS, 'all');
b=sum(throughputT, 'all');
 c=sum(throughputCN, 'all');
 d=sum(throughputCR, 'all');

Thanks alot

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Walter Roberson 2019-8-18

Where are throughputS, throughputT, throughputCN, and throughputCR coming from, and why is the input X not being used? Where is the output o coming from?

Your outputs a, b, c, and d are all going to be scalars, so it is not obvious what you would be plotting?

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Answer 1

Walter Roberson 2019-8-18

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Example:

N = 100;
o = zeros(N,1); a = zeros(N,1); b = zeros(N,1); c = zeros(N,1); d = zeros(N,1);
for idx = 1 : N
    X = rand(15,15);
   [o(idx), a(idx), b(idx), c(idx), d(idx)] = ObjectiveFunction(X);
end
plot([a,b,c,d])
legend({'a', 'b', 'c', 'd'});

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Answer 2

Luna 2019-8-19

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You should define the variables you are going to use as inputs of function. The inputs are written in the paranthesis.

All outputs must be assigned also.

function [o, a, b, c, d] = ObjectiveFunction(throughputS,throughputT,throughputCN,throughputCR)
 a=sum(throughputS, 'all');
 b=sum(throughputT, 'all');
 c=sum(throughputCN, 'all');
 d=sum(throughputCR, 'all');
 o = 'Luna';
end

Then you call this function as follows in another function:

function hPlot = anotherFunctionToPlotSomeData(w,x,y,z) % you should pass variable reference here.
  [o, a, b, c, d] = ObjectiveFunction(w,x,y,z)  % where your w,x,y,z becomes throughputS,throughputT,throughputCN,throughputCR respectively inside this function.
  % Now you obtained a,b,c,d (I don't know what to do with "o" variable but you get the idea)
  figure;
  hPlot = plot([a,b,c,d]); % this function also returns the plot handle (line class)
end

Also check below link to learn more about how to create functions:

function

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Walter Roberson 2019-8-19

The a, b, c, d returned are all going to be scalars, so plot([a,b,c,d]) would be a request to plot a line with four points. Although that is well defined, I suspect that is not what the poster had in mind.

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